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OSADA Masahiko
| Environmental Science and Civil Engineering Division | Professor |
| Department of Civil and Environmental Engineering |
Researcher information
■ Research Keyword- rock fracture, fluid flow, coral, alteration
- rock, shearing, fluid flow, visualization
- rock, geomaterial, drying-induced deformation
- rock mass
- rock
- Social infrastructure (civil Engineering, architecture, disaster prevention), Geotechnical engineering
■ Educational Background
- Mar. 1999 - Present, Saitama University, Japan
- Apr. 1988 - Mar. 1989, University of Tokyo, Graduate School, Division of Science, Japan
- Apr. 1984 - Mar. 1988, University of Tokyo, Faculty of Science, Japan
Performance information
■ Paper- Experimental Study on the Characteristics and Permeability Behavior of a Single Fracture in Triassic mudstones of the Kiwada Mine, Western Japan
Takato TAKEMURA; Yu TSUKURIMICHI; Takahisa ENDO; Kenichiro SUZUKI; Shogo KAWAKITA; Kenichi NAKAOKA; Koichi OKUZAWA; Masahiko OSADA
Volume：60, First page：131, Last page：136, Feb. 2025, [Reviewed], [Last]
English, Research institution - Strength changes associated with water transport in unsaturated tuff during drying
Yota Togashi; Haruhiko Kotabe; Masahiko Osada; Shingo Asamoto; Ken Hatakeyama
International Journal of Rock Mechanics and Mining Sciences, Volume：186, Feb. 2025, [Reviewed]
The impact of water content on the strength of sedimentary rocks is a critical area of research, particularly in the contexts of disaster prevention and the construction of underground structures. Despite numerous factors being identified as contributors to the strength variations in sedimentary rocks caused by water content, a comprehensive understanding remains elusive. Moreover, only a limited number of cases have been discussed on strength changes in these rocks during water transport processes. In this study, one-dimensional water transport experiments were conducted during the drying process on Neogene tuff samples from Japan. The experiments focused on the unsaturated permeation of the porous media and analyzed the variations in advection and diffusion terms relative to saturation changes at multiple points. During the drying process, water transfer occurred primarily through diffusion, although advection was significant in the early stages to equilibrate the hydraulic head at the center of the specimen. Furthermore, the same tuff samples, with adjusted water content during the drying process, were tested using Brazilian and uniaxial compression methods to examine the variations in strength properties owing to the variations in water content. By comparing these results with the water transport data, we observed that significant alterations in strength occurred after the convergence of the advection term. It was shown for the first time that the decrease in strength of tuff occurs only during the water diffusion phase. These results are expected to be applied to more accurate evaluation of rock mass stability and advanced numerical analysis.
Scientific journal
DOI：https://doi.org/10.1016/j.ijrmms.2024.105984
Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85211155098&origin=inward
Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85211155098&origin=inward
DOI ID：10.1016/j.ijrmms.2024.105984, ISSN：1365-1609, SCOPUS ID：85211155098 - 大断面函体推進における摩擦低減材の力学特性とその試験
梅津 拓未; 富樫陽太; 中村智哉; 長田昌彦
First page：334, Last page：339, Jan. 2025, [Reviewed], [Last]
Japanese, Symposium - 田下凝灰岩を用いた角柱供試体の単純せん断試験と供試体寸法が強度特性に与える影響
佐藤 礁; 富樫 陽太; 小田部 晏彦; 長田 昌彦
Volume：328, Number：333, Jan. 2025, [Reviewed], [Last]
Japanese, Symposium - Surface deformation of the landslide of Hattaro pass caused by the Noto Peninsula Earthquake
Teruyuki Kikuchi; Keiji Chida; Jun Tajika; Kentaro Kanayama; Kosuke Otsu; Teruyoshi Hatano; Shin Ando; Nobusuke Hasegawa; Hideki Inagaki; Masahiko Osada
Proceeings of the 4th European Regional Conference of IAEG, Dubrovnik, Croatia, 8-12 October 2024, First page：277, Last page：286, Oct. 2024, [Last]
English, International conference proceedings - A method of determining unsteady air permeability of rock
Yota Togashi; Masahiko Osada
Proceeings of the 4th European Regional Conference of IAEG, Dubrovnik, Croatia, 8-12 October 2024, First page：423, Last page：432, Oct. 2024
English, International conference proceedings - Preliminary report on damage caused by the 2024 Noto Peninsula Earthquake in JAPAN
Nobusuke Hasegawa; Ai Hamada; Masahiko Osada; Takao Chaish; Astuko Nonomura; Daisuke Yamada
Proceedings of KSEG 2024 Spring Conference / April 4 - 5, Apr. 2024
English, Symposium - 田下凝灰岩の不飽和強度特性と乾燥過程における水分特性曲線
小田部 晏彦,富樫 陽太,畠山 健,長田 昌彦
材料, Volume：73, Number：3, First page：212, Last page：219, Mar. 2024, [Reviewed] - トンネルや斜面崩壊の室内模型実験におけるLiDAR, 深度カメラの活用
小林 祐貴,富樫 陽太,Fernando W.S.G,戸頃 真尋,長田 昌彦
地盤工学会誌, Volume：72, Number：1, First page：39, Last page：42, Feb. 2024, [Reviewed], [Invited] - 不飽和状態における田下凝灰岩の強度特性
小田部 晏彦,富樫 陽太,畠山 健,長田 昌彦
第50回岩盤力学に関するシンポジウム講演集, Jan. 2024, [Reviewed] - 岩石角柱供試体の単純せん断試験における供試体寸法の影響
佐藤 礁,富樫 陽太,小田部 晏彦,長田 昌彦
第50回岩盤力学に関するシンポジウム講演集, Jan. 2024, [Reviewed] - A new simple shear test of rock prism specimen by torsional shearing
Yota Togashi, Riho Hirasawa, Masahiko Osada
15th ISRM Congress 2023 & 72nd Geomechanics Colloquium. Schubert & Kluckner (eds.) OCTOBER 09th - 14th, 2023, SALZBURG CONGRESS, AUSTRIA, First page：2472, Last page：2477, Oct. 2023, [Reviewed] - Fundamental study on estimation of permeability at in-situ EDZ from pore air pressure response
Masahiko Osada, Koji Osawa, Christina Putri Widyaningtyas, Yota Togashi
15th ISRM Congress 2023 & 72nd Geomechanics Colloquium. Schubert & Kluckner (eds.) OCTOBER 09th - 14th, 2023, SALZBURG CONGRESS, AUSTRIA, First page：2581, Last page：2585, Oct. 2023, [Reviewed] - In-Situ Measurement by One-Board Microcomputer Arduino and Its Application to Experimental Apparatus
TAKEMURA Takato; TSUKURIMICHI Yu; HOSONO Hinako; OSADA Masahiko
Journal of the Japan Society of Engineering Geology, Volume：63, Number：6, First page：307, Last page：313, Feb. 2023, [Reviewed]
Japan Society of Engineering Geology, Japanese
DOI：https://doi.org/10.5110/jjseg.63.307
DOI ID：10.5110/jjseg.63.307, ISSN：0286-7737, eISSN：1884-0973 - 史跡でのIoT 技術の活用事例
長田昌彦, 小澤一稀, 船引耕平, 金子義人, 高橋優輔
応用地質, Volume：63, Number：6, First page：297, Last page：306, Feb. 2023, [Reviewed] - Numerical approach to evaluate the influence of water saturation on the strength of Neogene Tuff in Utsunomiya city, Japan
Neranjan Ranaweera; Yota Togashi; Masahiko Osada; Ryo Kawanoue
IOP Conference Series: Earth and Environmental Science, Volume：1124, Number：1, 2023
Evaluation of the deformation behavior due to drying is crucial in underground construction works. Especially, geological repository for High-Level Radioactive Waste (HLW) shall be carefully selected to act as a natural barrier to prevent radioactive nuclide leaks. Uniaxial Compressive Strength (UCS) is one such governing factors when designing or selecting a suitable location for such underground storage compartments or access tunnels. Since nuclide leakage through geological repositories, intact rocks UCS will vary with the drying conditions. Hence, it is vital to evaluate the behavior of UCS subject to the conditions prescribed. A variety of statistical models has been built to govern the interdependency between UCS and water content. However, there are no significant amount of research have been conducted to emphasize the UCS variation with the degree of saturation under the influence of drying condition. Numerically, Richard's equation exact solution in Neuman boundary condition has been derived to exploit the degree of saturation with respect to time and position. Experimentally, obtain the UCS variation with the degree of saturation pertaining to the Neogene Tuff in Utsunomiya city, Japan. A best fit statistical model was generated for experimental data between UCS variation and the degree of saturation. Then, the experimental saturation degree was replaced by Richard's equation exact solution saturation degree values. Surprisingly, produced graphs for experimental data and numerical analysis data for exact solution were perfectly overlapped. Results point out that change of UCS shows similar characteristics, which exponentially decrease, with both experimental saturation values and exact solution saturation values influenced the drying condition. Moreover, it suggests that UCS value can be predicted subject to the time and position in the sedimentary rocks under drying conditions.
International conference proceedings
DOI：https://doi.org/10.1088/1755-1315/1124/1/012121
Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85146632350&origin=inward
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DOI ID：10.1088/1755-1315/1124/1/012121, ISSN：1755-1307, eISSN：1755-1315, SCOPUS ID：85146632350 - ねじりを利用した岩石角柱供試体の単純せん断試験の提案
富樫陽太, 平沢梨帆, 長田昌彦
岩盤力学に関するシンポジウム講演集, Jan. 2023, [Reviewed] - 廃棄物埋設における掘削に伴う岩盤の力学状態と水理特性を踏まえた地下水移動評価の考え方
東原知広, 市耒高彦, 入江正明, 長田昌彦
岩盤力学に関するシンポジウム講演集, Jan. 2023, [Reviewed] - 廃棄物埋設における岩盤の力学水理連成試験機の製作と動作確認試験
市耒高彦, 東原知広, 入江正明, 長田昌彦
岩盤力学に関するシンポジウム講演集, Jan. 2023, [Reviewed] - 含水に伴う田下凝灰岩の強度変化と平均応力変化によるモデル化
小田部晏彦, 富樫陽太, 長田昌彦, 畠山健
岩盤力学に関するシンポジウム講演集, Jan. 2023 - 切羽崩壊の進行性に関するトンネル引抜き実験とすべり線の形状変化を考慮したアーチ作用のモデル化
川之上諒, 富樫陽太, 小林祐貴, 長田昌彦
岩盤力学に関するシンポジウム講演集, Jan. 2023, [Reviewed] - Evaluating changes in the degree of saturation in excavation disturbed zones using a stochastic differential equation
Yota Togashi, Kazuki Mizuo, Masahiko Osada, Tadashi Yamabe, and Hiroshi Kameya
Comput and Geotech, Volume：143, First page：104598, Mar. 2022, [Reviewed] - 地山のせん断抵抗角と土被りが切羽安定性に及ぼす影響の実験的検討
川之上諒, 八木橋辰紀, 富樫陽太, 長田昌彦
岩盤力学に関するシンポジウム講演集, Jan. 2022, [Reviewed] - 堆積軟岩における含水状態がモールクーロン破壊基準に及ぼす影響
小砂子優貴, 富樫陽太, 畠山健, 川之上諒, 長田昌彦
岩盤力学に関するシンポジウム講演集, Jan. 2022, [Reviewed] - Seasonal change of a fracture aperture in porous tuffaceous rock with 0.01mm -order real-time monitoring
Masahiko Osada and Kohei Funabiki
In: Rock Mechanics and Engineering Geology in Volcanic Fields, CRC Press, First page：296, Last page：301, Sep. 2021, [Reviewed] - Principal strain rotation of anisotropic tuff due to continuous water-content variation
Yota Togashi, Takanobu Imano, Masahiko Osada, Koichi Hosoda, and Koji Ogawa
International Journal of Rock Mechanics and Mining Sciences, Volume：138, First page：104646, Feb. 2021, [Reviewed] - Deformation Characteristics of sedimentary rock due to continuous changes of moisture content in wetting process
Yota Togashi, Takanobu lmano and Masahiko Osada
17th World Conference ACUUS 2020 February 3-4 2021, (Helsinki, Finland) Virtual Conference, Feb. 2021, [Reviewed] - 大気圧変動に対する飽和度低下による間隙空気圧変化の時系列解析
長田昌彦・竹村貴人・五嶋壮太・富樫陽太・大沢光司
第15回岩の力学国内シンポジウム講演論文集, Jan. 2021, [Reviewed] - Rotation of Three Principal Strains of Tuff during Drying Shrinkage
Togashi, Y., Osada, M., and T. Yamabe
ISRM International Symposium - EUROCK 2020, Jun. 2020, [Reviewed] - Initial observations of an X-band Dual Polarimetric Phased Array Weather Radar
H. Kikuchi, T. Suezawa, T. Ushio, N. Takahashi, H. Hanado, K. Nakagawa, M. Osada, T. Maesaka, K. Iwanami, K. Yoshimi, F. Mizutani,M. Wada, and Y. Hobara
IEEE Transactions on Geoscience and Remote Sensing (TGRS), Volume：58, First page：3657, Last page：3666, May 2020, [Reviewed] - 田下凝灰岩を用いた大気圧に対する岩石内間隙空気圧の応答実験
五嶋 壮太・長田 昌彦・富樫 陽太・竹内 希海
岩盤力学に関するシンポジウム, Jan. 2020, [Reviewed] - Pore air pressure measurement at Mont Terri Rock Laboratory, Switzerland
M. Osada, T. Takemura, Y. Togashi and S. Goshima
The 5th ISRM Young Scholars' Symposium on Rock Mechanics and International Symposium on Rock Engineering for Innovative Future, Dec. 2019, [Reviewed] - Experimental Investigation on Effects of Water Flow to the Freezing Sand around Vertically Buried Freezing Pipe
Rangga SUDISMAN, Masahiko OSADA & Tadashi YAMABE
Journal of Cold Regions Engineering, ASCE, Vol.33 No.3, 2019., Volume：33, Number：3, First page：04019004, May 2019, [Reviewed] - Determination of dynamic elastic properties from the frequency of natural vibration by using impact acoustics
T. Yamabe, M. Osada & C. Adachi
Proceedings of the 2019 Rock Dynamics Summit (RDS 2019), May 2019, [Reviewed] - Development of Multi-Parameter Phased Array Weather Radar (MP-PAWR) and Early Detection of Torrential Rainfall and Tornado Risk
Nobuhiro Takahashi, Tomoo Ushio, Katsuhiro Nakagawa, Fumihiko Mizutani, Koyuru Iwanami, Akihiko Yamaji, Takeshi Kawagoe, Masahiko Osada, Takehiro Ohta, Masaki Kawasaki
Journal of Disaster Research, Volume：14, Number：2, First page：235, Last page：247, Mar. 2019, [Reviewed] - 軟岩からなる素掘りトンネル天端に形成された開口亀裂の温度依存性挙動
長田昌彦・細川一樹・宮本翔太
第46回岩盤力学に関するシンポジウム講演集, Jan. 2019, [Reviewed] - Evaluating the deformation behavior of Horonobe mudstone using water retention curves
Amunugama, B. C.; Osada, M.; Illankoon, T. N. & Maekawa, K.
Proceedings of the 14th Japan Rock Mechanics Symposium, Kobe, Japan, Jan. 2017 - Strain and Strength of Saturated and Dried Rock Samples Under a Freeze-Thaw Cycle
Sudismana, R. A.; Yamabe, T. & Osada, M.
Proceedings of 9th Asian Rock Mechanics Symposium, Oct. 2016, [Reviewed] - Heat Transfer Visualization on the Application of Cooling Pipe in Sand with Flowing Pore Water
Rangga SUDISMAN, Masahiko OSADA & Tadashi YAMABE
Journal of Cold Regions Engineering, Volume：31, Number：1, Aug. 2016, [Reviewed] - Drying- and wetting- induced behavior of Shirahama sandstone under the evaporative condition of tunnel surface
Osada, M. & Ohtake, S.
EUROCK 2016, Taylor & Francis, London, First page：1029, Last page：1033, Aug. 2016, [Reviewed] - Application of multiple geophysical techniques from ground surface to the survey of underground geological structure
Matsushita, T.; Masumoto, K. & Osada, M.
Creative development of rock mechanics and engineering, May 2016 - Effect of drying process on water retention curve in mudstone
Osada, M.; Amunugama, B. C.; Illankoon, T. N. & Maekawa, K.
Creative development of rock mechanics and engineering, May 2016 - Effect of saturation level on deformation and wave velocity of a transversely isotropic sedimentary rock
Illankoon, T. N. and Osada, M.
International Journal of the Japanese Society for Rock Mechanics, Volume：12, Number：1, First page：1, Last page：9, Mar. 2016, [Reviewed] - PORE AIR PRESSURE CHANGE OF SANDSTONE AND MADSTONE WITH WATER IMMERSION AND EVALUATION USING THE EQUIVALENT CHANNEL MODEL
武藤 圭佑; 長田 昌彦
Volume：44, First page：273, Last page：277, Jan. 2016, [Reviewed]
Japanese
ISSN：1880-7623, CiNii Articles ID：40020793413, CiNii Books ID：AA12192775 - Heat Transfer Characteristic of Saturated Sand in Steady Flow around a Cooling Pipe
Sudisman, R. A., Osada, M., Yamabe, T. & Tobita, D.
The 10th Asian Regional Conference of IAEG, Sep. 2015, [Reviewed] - Strain characteristic of dried rocks sample under freezing and thawing condition
Sudisman, R. A., Yamabe, T. & Osada, M.
Proceedings ISRM Congress 2015, May 2015, [Reviewed] - BEHAVIOR OF SHIRAHAMA SANDSTONE DURING DRYING UNDER THE CONDITION THAT SIMULATES TUNNEL SURFACE
大竹 伸太朗; 長田 昌彦
Volume：43, First page：193, Last page：198, Jan. 2015, [Reviewed]
Japanese
ISSN：1880-7623, CiNii Articles ID：40020348150 - 屋久島沿岸域の岩盤露頭における単一割れ目内の充填物質の年代値とその変動要因の検討
松下智昭,長田昌彦,高橋 学,藤井幸泰
応用地質, Volume：56, Number：1, First page：2, Last page：14, 2015, [Reviewed] - Effect of shrinkage level on elastic modulus in drying-induced deformation process of soft sedimentary rocks
Thilini Nuwanradha Illankoon and Masahiko Osada
Proceedings of 8th Asian Rock Mechanics Symposium, Oct. 2014, [Reviewed] - Study on dynamic properties of rock discontinuity using dynamic direct shear test machine
Jun Yoshida, Ryunoshin Yoshinaka, Takeshi Sasaki and Masahiko Osada
Proceedings of 8th Asian Rock Mechanics Symposium, Oct. 2014, [Reviewed] - Drying-induced deformation characteristics of rocks
Masahiko Osada
Proc. of 8th Asian Rock Mechanics Sympo., Oct. 2014, [Invited] - Petrological Characterization of Precision Stone and Its Mechanism of Nano/Micro-Deformation Under Wet Condition
竹村 貴人,高橋 学,長田 昌彦,北村 圭史
材料, Volume：63, Number：3, First page：227, Last page：233, Mar. 2014, [Reviewed]
Japanese
ISSN：0514-5163, CiNii Articles ID：40020027361, CiNii Books ID：AN00096175 - 乾燥過程における白浜砂岩の挙動についての数値解析的検討
大竹 伸太朗,長田 昌彦
第42回岩盤力学に関するシンポジウム講演集, Jan. 2014, [Reviewed] - Boulder transport by the 2011 Great East Japan tsunami: Comprehensive field observations and whither model predictions?
Nandasena, N., Tanaka, N., Sasaki, Y. & Osada, M.
Marine Geology, Volume：346, First page：292, Last page：309, Dec. 2013, [Reviewed] - Development of coupled shear-flow-visualization apparatus and data analysis
Park, H., Osada, M., Matsushita, T., Takahashi, M. & Ito, K.
International Journal of Rock Mechanics and Mining Sciences, Volume：63, First page：72, Last page：81, Oct. 2013, [Reviewed] - 堆積岩試料における水分量と物性の変化に関する数値解析的検討
前川 恵輔,長田 昌彦,多田 浩幸, 熊坂 博夫
第13回岩の力学国内シンポジウム講演論文集（併催：日韓ジョイントシンポジウム）, Jan. 2013, [Reviewed] - 常時微動観測に基づく岩塊の振動特性と回転半径の推定方法
別役 昌孝,長田 昌彦,茂木 秀則, 荒井 進吾
第13回岩の力学国内シンポジウム講演論文集（併催：日韓ジョイントシンポジウム）, Jan. 2013, [Reviewed] - 屋久島沿岸部の堆積岩露頭で観察される単一割れ目内の充填物質の年代値と微視的構造
松下 智昭,長田 昌彦, 高橋 学
第13回岩の力学国内シンポジウム講演論文集（併催：日韓ジョイントシンポジウム）, Jan. 2013, [Reviewed] - Drying-induced deformation of Horonobe sedimentary rocks in the Koetoi and Wakkanai formations
Illankoon, T. N.,Yee, S. M.,Osada, M.,Maekawa, K.,Tada, H., Kumasaka, H.
Proceedings of the 13th Japan Symposium on Rock Mechanics & the 6th Japan Korea Joint Symposium, Jan. 2013, [Reviewed] - Microscopic observation of water containing micro-bubbles flows through fractured mudstone specimens
Pardede, F. H., Osada, M.
Proceedings of the 13th Japan Symposium on Rock Mechanics & the 6th Japan Korea Joint Symposium, Jan. 2013, [Reviewed] - 3次元モデルを用いた堆積軟岩のせん断ー透水連成挙動研究
朴 赫,伊藤 一誠,竹野 直人,高橋 学,長田 昌彦, Grzegorz, S.
第13回岩の力学国内シンポジウム講演論文集（併催：日韓ジョイントシンポジウム）, Jan. 2013, [Reviewed] - Age variations of layered fillings within a single fracture in sedimentary rock at coastal outcrops of Yakushima Island, Japan
Matsushita, T.,Osada, M. , Takahashi, M.
Proceedings of 7th Asian Rock Mechanics Symposium, Oct. 2012, [Reviewed] - Effect of desiccation on the strain and elastic wave velocities of Tage Tuff
Illankoon, T. N.,Osada, M., Adikaram, N. M.
Proceedings of 7th Asian Rock Mechanics Symposium, Oct. 2012, [Reviewed] - AMS 14C ages and petrological features for solidified fractures with carbonates in granite at coastal outcrops of Yakushima Island, Japan
Mathushita, T., Osada, M., Takahashi, M.
Environmental Earth Sciences, Volume：68, First page：577, Last page：584, Jun. 2012, [Reviewed] - 田下凝灰岩の力学的異方性と飽和度の変化に伴う弾性波速度および変形の変化傾向
長田 昌彦 ・Adikaram, A.
第41回岩盤力学に関するシンポジウム講演集, Jan. 2012, [Reviewed] - 珪藻質泥岩の水分量変化に伴う物性変化に関する研究
前川 恵輔・長田 昌彦
第41回岩盤力学に関するシンポジウム講演集, Jan. 2012, [Reviewed] - Experimental study on fluid flow containing microbubbles through porous sandstone and sand grains
Rangga A. Sudisman; Masahiko Osada; Takato Takemura; Manabu Takahashi
ISRM Regional Symposium - 7th Asian Rock Mechanics Symposium, ARMS 2012, First page：1000, Last page：1009, 2012, [Reviewed]
Two laboratory-scale experimental studies were conducted to investigate the sandstone-microbubble interaction. The first study focuses on the migrating process of fluid with microbubbles through the rock pores and fractures. An apparatus has been set up to conduct the hydraulic conductivity test through Berea sandstone sample. The hydraulic conductivity tests were conducted by flowing water and water containing microbubbles through the plate shape sample. The result of the hydraulic conductivity tests showed a difference between water flow and water with microbubbles. The second study focuses on the microscopic observation to investigate the physical behavior of microbubble movement in water flow and the interaction mechanism between Toyoura sand’s grains and the microbubbles. Main component of this experiment is the transparent observation channel made of double acrylic plates. Sand grains were placed between the plates and the fluid was flowed through it. The interaction mechanisms were analyzed based on video recordings and images which need to be confirmed by further experiments.
International Society for Rock Mechanics, English, International conference proceedings
SCOPUS ID：85056233989 - Drying-induced deformation and consequent change in mechanical properties of sedimentary rocks
Osada, M., Adikaram, N. M. & Illankoon, T. N.
Proceedings of 12th ISRM International Congress on Rock Mechanics, Oct. 2011, [Reviewed] - Characteristics and ages of rock fractures filled with carbonatesin the vicinity of uplifted corals
Mathushita, T., Osada, M. & Takahashi, M.
45th US Rock Mechanics / Gemechanics Symposium, Jun. 2011, [Reviewed] - Anisotropic behavior of Tage tuff in changing saturation
Adikaram, A., Osada, M. & Yamabe, T.
Research report of department of civil and environmental engineering, Volume：37, First page：25, Last page：32, Mar. 2011 - Drying-Induced Deformation of Sedimentary Rocks and Its Resulting Phenomena and Future Works
OSADA Masahiko; TAKAHASHI Manabu; TAKEMURA Takato
Shigen-to-Sozai, Volume：127, Number：3, First page：127, Last page：131, Feb. 2011, [Reviewed]
Drying-induced deformations of porous materials are ubiquitous phenomena, but coupled behaviors of moisture content inside the material and deformation, which are difficult to express the behavior as a physical model. This is partly because multiple mechanisms governing drying-induced deformation are involved so that each mechanism may become dominant by respective situations. This article introduces various activities or efforts in some research fields, and retrieves common results in laboratory experiments and in field observations, mainly for sedimentary rocks. Through these processes, future works to be considered are elucidated.
The Mining and Materials Processing Institute of Japan, Japanese
DOI ID：10.2473/journalofmmij.127.127, ISSN：1881-6118, CiNii Articles ID：10027793303, CiNii Books ID：AA12188381 - 炭酸カルシウムで充填した岩石割れ目の微視的観察；屋久島の花崗岩と堆積岩を対象として
松下智昭、長田昌彦、高橋学
第40回岩盤力学に関するシンポジウム, Jan. 2011, [Reviewed] - 各種岩石の乾燥変形現象の比較によるその支配要因の検討
長田昌彦
第40回岩盤力学に関するシンポジウム, Jan. 2011, [Reviewed] - Drying-induced deformation behaviour of Shirahama sandstone in no loading regime
Aung Ko Ko Soe; Masahiko Osada; Thandar Thetoe Nwe Win
ENGINEERING GEOLOGY, Volume：114, Number：3-4, First page：423, Last page：432, Aug. 2010, [Reviewed]
In this study, an attempt has been made to investigate the deformation behaviour of Shirahama sandstone in drying process using small cylindrical samples. A series of comprehensive laboratory experiments was performed in different drying conditions under a no applied load. Saturated cylindrical samples were dried in a climatic chamber while deformation and evaporative water loss were being monitored. The results obtained are reported and further used in linear poroelastic relation in order to derive the matric suction evolution. In addition, mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM) were used for evaluating their pore structure and explained its role on measured strain and estimated matric suction. The results show that virtually no volume change occurs in the samples until half of the saturated water content is evaporated. It also reveals that the maximum dimensional change capacity is independent of drying condition but evaporation rate and strain occurrences are shown to be affected significantly. In addition, the study of pore structure indicates that substantial strain magnitude and high matric suction occurrence are attributed to water loss from small pores in the clay matrix. Throughout the process, the samples displayed neither a likelihood nor tendency of damage or destruction. However, strain magnitude is observed to be higher for the sample saturated with concentrated sodium sulphate solution. The present study sheds light on essential elements in the studies of dimensional changes of clay bearing sandstone to assist in evaluating ground movement, deterioration, fluid flow and isolation properties of underground facilities. (C) 2010 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE BV, English, Scientific journal
DOI：https://doi.org/10.1016/j.enggeo.2010.06.001
DOI ID：10.1016/j.enggeo.2010.06.001, ISSN：0013-7952, Web of Science ID：WOS:000280884200028 - Hydraulic Properties of a Single Rock Fracture Filled by Calcite
TAKEMURA Takato; OSADA Masahiko; FUJII Yukiyasu; KANAMARU Tatsuo; TAKAHASHI Manabu
Journal of the Japan Society of Engineering Geology, Volume：51, Number：2, First page：92, Last page：96, Jun. 2010, [Reviewed]
 In order to estimate long-term hydraulic properties of rocks, we carried out the comparison between a permeable fracture and a low-permeable fracture filled by calcite, and evaluated three-dimensional structure of both fractures by means of X-ray computed tomography. As a result, the low-permeable fracture function as permeable fracture because the joint is connected to each other as channel. Furthermore, the permeability of fracture filled by calcite is the potentially same permeability of permeable fracture since the calcite dissolve in the longer term.
一般社団法人 日本応用地質学会, Japanese
DOI：https://doi.org/10.5110/jjseg.51.92
DOI ID：10.5110/jjseg.51.92, ISSN：0286-7737, CiNii Articles ID：10030698469 - 来待砂岩の強度・変形特性における中間主応力の影響
宮崎裕一、高橋学、長田昌彦
第39回岩盤力学に関するシンポジウム, Jan. 2010, [Reviewed] - 精密計測・超平面の創成に使われる精密石材の湿潤環境下での微小変形メカニズムの解明
竹村貴人、高橋学、長田昌彦、北村圭史
第39回岩盤力学に関するシンポジウム, Jan. 2010, [Reviewed] - 花崗岩中に形成されたサンゴ脈の年代値と物質移行過程
松下智昭、長田昌彦、高橋学
第39回岩盤力学に関するシンポジウム, Jan. 2010, [Reviewed] - 花崗岩における水みち近傍の硬化原因に関する化学的検討
松下 智昭; 長田 昌彦; 竹村 貴人; 高橋 学
第38回岩盤力学シンポジウム論文集, Jan. 2009, [Reviewed]
Japanese, Research society - Characterization of drying-induced deformation behaviour of Opalinus clay and Tuff in no-stress regime
Aung Ko Ko Soe and Masahiko Osada and Manabu Takahashi and Tai Sasaki
Environmental Geology, Volume：58, Number：6, First page：1215, Last page：1225, 2009, [Reviewed]
Springer, Scientific journal - ヘッセ行列を用いた画像解析に基づく岩石の割れ目断面積の評価
安 昶完, 長田 昌彦, 高橋 学
第38回岩盤力学に関するシンポジウム, Jan. 2009, [Reviewed] - 一面せん断変形下における岩石の透水特性の変化
熊谷 聡之, 長田 昌彦, 朴 赫
第38回岩盤力学に関するシンポジウム, Jan. 2009, [Reviewed] - Combination of Genetic Algorithm and Inverse Solution Technique for Estimating the Hydraulic Properties of Unsaturated Soft Rock
MAUNG MAUNG Min; WATANABE Kunio; SASAKI Tai; OSADA Masahiko
Journal of the Japan Society of Engineering Geology, Volume：49, Number：2, First page：64, Last page：77, Jun. 2008, [Reviewed]
Unsaturated hydraulic property (relation between the water retention curve and hydraulic conductivity function) of soft rock must be properly estimated for analyzing the saturated-unsaturated groundwater flow such as the flow around a tunnel, rock surface and so forth. In this study a practical technique for estimating the unsaturated hydraulic property of soft rock was developed on the basis of the Campbell model and Genetic Algorithm (GA). The major objectives of the present study are the following two; 1) investigation whether or not the Campbell model can be applied to soft rock for approximating the unsaturated hydraulic properties and 2) application of GA technique for estimating two parameters included in the Campbell model. These parameters were estimated through the inverse analysis of the transient change of evaporation rates from a surface of disk shaped specimen of Tertiary sedimentary rock which are sampled from the Rokkasho area, Aomori prefecture. Two transient evaporation experiments under different atmospheric conditions were proposed for the estimation. The Campbell's parameters of 13 soft rock specimens (5 sandstone and 8 tuff breccia specimens) were estimated through those types of experiments. As the results it was clearly found that the transient change of evaporation rates can be well fitted by the Campbell model except for the region of low saturation and this fact implies that the Campbell model can be applied to the soft rock. And also it was found that, the GA is a promising technique for parameters estimation in the inverse solution method. It can be concluded that the techniques are practically for estimating the unsaturated hydraulic properties of soft rock.
Japan Society of Engineering Geology, English, Scientific journal
DOI ID：10.5110/jjseg.49.64, ISSN：0286-7737, CiNii Articles ID：110006781835, CiNii Books ID：AN00026635 - Practical determination of mechanical design parameters of intact rock considering scale effect
R. Yoshinaka; M. Osada; H. Park; T. Sasaki; K. Sasaki
ENGINEERING GEOLOGY, Volume：96, Number：3-4, First page：173, Last page：186, Feb. 2008, [Reviewed]
As a rule, the change in mechanical properties of rock by specimen size is regarded as scale effect. A rock mass basically consists of two components: intact rock and discontinuities, each of which has different scale effects. In order to numerically analyze the behavior of discontinuous rock masses, sufficient mechanical properties must be determined not only for discontinuities but also for intact rock taking into consideration the different scale effects. This paper reviews the scale effect on strength and deformation characteristics of intact rock, and also discusses the possibility of using standard specimens to estimate strength and deformation characteristics of actual-scale rock. Finally, we propose an adequate method for the practical determination of mechanical design parameters based on the above discussions. (C) 2007 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE BV, English, Scientific journal
DOI：https://doi.org/10.1016/j.enggeo.2007.10.008
DOI ID：10.1016/j.enggeo.2007.10.008, ISSN：0013-7952, CiNii Articles ID：80017994945, Web of Science ID：WOS:000253183400005 - Deformation Behavior of Soft Sedimentary Rocks in Response to Drying Phase
Aung Ko Ko Soe, Osada, M.
The 6th Asian regional conferenece on Geohazards in Engineering Geology, Oct. 2007 - Shear-flow properties of pumice tuff including initial failure and direct observation of shear deformation
Park, H., Osada, M. & Sasaki, T.
The 6th Asian regional conferenece on Geohazards in Engineering Geology, Oct. 2007 - Microtremor measurement for rock-fall hazard assessment
Mogi, H., Osada, M. & Hashida, T.
The 6th Asian regional conferenece on Geohazards in Engineering Geology, Oct. 2007 - 堆積岩の乾燥変形過程と多孔質弾性論的解釈
長田 昌彦,山辺 正
第36回岩盤力学に関するシンポジウム, Jan. 2007, [Reviewed] - Application of rock mass integration method (RMIM) with DDA modeling in rock slope stability
M Osada; SK Shrestha; T Kajiyama; K Yamaguchi
Contribution of Rock Mechanics to the New Century, Vols 1 and 2, First page：1257, Last page：1262, Nov. 2004, [Reviewed]
We call the construction method which stabilizes unstable rocks by binding the joints together with special mortar, Rock Mass Integration Method (RMIM). In order to examine the reinforcement effect, large scale shear tests were conducted on Tage Tuff and Inada Granite block samples containing a single through-going joint at varying normal stresses, which is filled with and without SBR polymer cement mortar. The overall dimensions of the blocks were 80 x 40 x 20cm. Moreover, joint surface roughness measurements, uniaxial compression tests, Brazilian tests, direct tensile tests and P and S wave measurements were conducted. Test results shows that shear strength of rock joints filled with the mortar increases significantly, and the effect increases with increase in rock strength. 2D-DDA analysis also shows that RMIM is an effective and useful method for minimizing or preventing slope failure in Rock Slope Stability.
MILLPRESS SCIENCE PUBLISHERS, English, International conference proceedings
Web of Science ID：WOS:000228664700216 - Constituent material properties and clast size distribution of volcanic breccia
Saotome, A., Yoshinaka, R., Osada, M. & Sugiyama, H.
Engineering Geology, Volume：64, First page：1, Last page：17, Apr. 2002, [Reviewed]
Scientific journal - 神津島流紋岩斜面への岩盤接着工法の適用事例（神津島近海地震での検証）
小野田 敏, 桜井 隆明, 長田 昌彦, 山口 健二, 桜井 秀昭, 梶山 敏也
地すべり, Volume：39, Number：1, First page：119, Last page：127, Apr. 2002, [Reviewed]
Scientific journal - 三軸圧縮試験による火山角礫岩の強度及び変形特性
吉中 龍之進, 長田 昌彦, 五月女 敦, 杉山 弘泰, 浜野 久美
土木学会論文集, Number：No.673/III-54, First page：85, Last page：100, Mar. 2001, [Reviewed]
土木学会, Scientific journal - 平板載荷試験による火山角礫岩の変形挙動とその数値解析
五月女 敦, 吉中 龍之進, 長田 昌彦, 杉山 弘泰
第31回岩盤力学に関するシンポジウム論文集, First page：1, Last page：7, Jan. 2001, [Reviewed]
土木学会, Scientific journal - 火山角礫岩の三次元粒径分布特性
長田 昌彦, 吉中 龍之進, 五月女 敦, 杉山 弘泰
第31回岩盤力学に関するシンポジウム論文集, First page：146, Last page：150, Jan. 2001, [Reviewed]
土木学会
CiNii Articles ID：80012239561 - 熱収縮チューブ（HST)を利用した岩石のひずみ計測方法の検討
長田 昌彦, 山辺 正, 吉中 龍之進, 浜野 久美
土木学会論文集, Number：No.638/III-49, First page：217, Last page：226, Dec. 1999, [Reviewed]
土木学会, Scientific journal - レプリカフィルムからのクラック抽出方法とその画像解析方法の検討
長田 昌彦, 樫野 誠, 山辺 正, 吉中 龍之進
応用地質, Volume：40, Number：1, First page：36, Last page：46, Apr. 1999, [Reviewed]
Scientific journal - 稲田花崗岩の初期マイクロクラック分布
長田 昌彦, 山辺 正, 吉中 龍之進
応用地質, Volume：39, Number：6, First page：500, Last page：510, Feb. 1999, [Reviewed]
Scientific journal - Non-linear, stress- and strain-dependent behavior of soft rocks under cyclic triaxial conditions
R Yoshinaka; TV Tran; M Osada
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES, Volume：35, Number：7, First page：941, Last page：955, Oct. 1998, [Reviewed]
Four saturated Miocene soft rocks of Japan i.e. Ohya tuff, Yokohama siltstone, Kobe mudstone and sandstone were tested under consolidated-undrained, cyclic loading conditions. The deformation behavior, pore pressure changes and strength mobilization, and contraction/dilation characteristics of these rocks were studied with emphasis on the non-linearity, stress-and strain-dependence of their mechanical properties. A procedure was introduced to locate the yield point, to estimate Young's modulus and to study the deformation behavior of these soft rocks. Deformation modulus was found to depend on plastic straining according to an exponential equation, whose coefficients in turn, depend on confining pressure. In addition, it also depends on the deviatoric stress levels causing hysteresis to occur. Patterns of pore pressure changes and associated failure modes were interpreted in terms of the initiation/propagation of micro- and macro-cracks inside the specimens. Characteristic stress levels were found based on which the "true" rock strength components - cohesion and internal friction angle were determined and their mobilization with respect to stress and strain levels was analyzed using a new interpretation method. Volume change tendencies were inferred from pore pressure changes whose rate was related to the contraction/dilation behavior of soft rocks. On that basis the dilation angle was estimated and its variation and stress- and strain-dependence was analyzed. A simple equation was introduced to characterize the variation of both internal friction and dilation angles with plastic straining, whereas their stress-dependence was studied through the variation of fit coefficients with confining pressure. (C) 1998 Elsevier Science Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, English, Scientific journal
DOI：https://doi.org/10.1016/S0148-9062(98)00158-2
DOI ID：10.1016/S0148-9062(98)00158-2, ISSN：0148-9062, CiNii Articles ID：80010491339, Web of Science ID：WOS:000075842900007 - 稲田花崗岩の変形・強度特性におけるひずみ速度依存性とその微視的考察
武石 裕幸, 原口 直樹, 長田 昌彦, 吉中 龍之進
第10回岩の力学国内シンポジウム講演論文集, First page：31, Last page：36, Jan. 1998, [Reviewed] - 花崗岩類中の水みちと原位置応力場との関係について
長田 昌彦, 松井 裕哉 & 吉中 龍之進
第42回地盤工学シンポジウム平成9年度発表論文集, First page：9, Last page：14, 1998, [Reviewed]
地盤工学会 - 花崗岩の変形・強度特性におけるひずみ制御方法の影響
吉中 龍之進, 長田 昌彦, 武石 裕幸 & 原口 直樹
岩の一軸および三軸圧縮試験の方法と結果の適用に関するシンポジウム発表論文集, First page：99, Last page：104, 1998
地盤工学会 - Pore pressure changes and strength mobilization of soft rocks in consolidated-undrained cyclic loading triaxial tests
R Yoshinaka; TV Tran; M Osada
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES, Volume：34, Number：5, First page：715, Last page：726, Jul. 1997, [Reviewed]
Changes in the pore pressure during CU (Consolidated-Undrained) cyclic loading triaxial tests on fully saturated specimens of four Miocene soft rocks, i.e. Ohya tuff, Yokohama siltstone, Kobe mudstone and sandstone ave analysed. As a result, three modes of failure, i.e. brittle, brittle-ductile and ductile can be recognized, and other characteristic stress levels e.g. crack initiation stress, plastic flow/gliding stress, dilation stress, etc. identified. The mobilization of the strength of these rocks in terms of cohesion and internal friction angle is then discussed. A procedure for the estimation of the rock cohesion strength is first introduced on the basis of the modified Griffith's failure criterion. The determination of the mobilized friction angle at any state of stress during the tests follows. (C) 1997 Elsevier Science Ltd.
PERGAMON-ELSEVIER SCIENCE LTD, English, Scientific journal
DOI：https://doi.org/10.1016/S0148-9062(97)00006-5
DOI ID：10.1016/S0148-9062(97)00006-5, ISSN：0148-9062, CiNii Articles ID：80009821727, Web of Science ID：WOS:A1997XU58600001 - 地下水流れの長期予測 －その可能性－
徳永 朋祥, 千木良 雅弘, 長田 昌彦, 増本 清
月刊地球, Volume：19, Number：6, First page：323, Last page：326, Jun. 1997
Scientific journal - 岩盤割れ目系の形成過程を考慮した浸透特性の評価
長田 昌彦
月刊地球, Volume：19, Number：6, First page：358, Last page：363, Jun. 1997
Scientific journal - Mechanical behavior of soft rocks under triaxial cyclic loading conditions
Ryunoshin Yoshinaka and Tran Tan Van and Masahiko Osada
Int.J.Rock Mech.Min.Sci.& Geomech.Abstr.(36th U.S.Rock Mech. Symp., NYRock'97), 1997, [Reviewed] - Deformation behaviour of soft rocks during consolidated-undrained cyclic triaxial testing
R Yoshinaka; M Osada; TV Tran
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES & GEOMECHANICS ABSTRACTS, Volume：33, Number：6, First page：557, Last page：572, Sep. 1996, [Reviewed]
The deformation behaviour of four Miocene soft rocks, namely Ohya tuff, Yokohama siltstone, Kobe mudstone and sandstone is analyzed on the basis of the results of cyclic CU triaxial tests. A procedure for strain correction, Young's modulus estimation and yield location is introduced. Relative to the ultimate failure stress, soft rocks tend to yield sooner, while their maximum deformation moduli increase, though non-linearly, at higher confining pressures. Both axial strain and axial plastic strain, attained at failure and at the onset of residual state also tend to increase with confining pressure. Once the rocks yield, deformation moduli decrease exponentially with respect to the axial plastic strain, depending on their maximum, elastic magnitude and confining pressures and a fitted equation is proposed. Copyright (C) 1996 Elsevier Science Ltd
PERGAMON-ELSEVIER SCIENCE LTD, English, Scientific journal
DOI：https://doi.org/10.1016/0148-9062(96)00025-3
DOI ID：10.1016/0148-9062(96)00025-3, ISSN：0148-9062, CiNii Articles ID：80009201317, Web of Science ID：WOS:A1996VJ66400002 - The comparison between dynamic and static strength of soft sedimentary rocks
R Yoshinaka; M Osada
ROCK FOUNDATION, First page：109, Last page：114, 1995, [Reviewed]
A A BALKEMA, English, International conference proceedings
Web of Science ID：WOS:A1995BE48U00014 - 繰り返し応力下の間隙水圧変化に基づく岩石内部のマイクロクラック量の推定
長田 昌彦
第9回岩の力学国内シンポジウム講演論文集, First page：443, Last page：448, 1994, [Reviewed]
岩の力学連合会 - 砂質マトリックスを有する礫混じり軟岩の強度特性
吉中 龍之進, 小林 隆志, 長田 昌彦 & 榊原 正文
第25回岩盤力学に関するシンポジウム, Jan. 1993, [Reviewed] - 動的繰り返し荷重下における堆積軟岩の強度・変形特性
吉中 龍之進, 長田 昌彦 & 堀 渉
第25回岩盤力学に関するシンポジウム, Jan. 1993, [Reviewed] - Stripa 鉱山での蒸発量計測によるグラウチング効果の検討
長田 昌彦, 渡辺 邦夫 & ほか
第24回岩盤力学に関するシンポジウム, Jan. 1992, [Reviewed]
- 東日本大震災後における日本応用地質学会の取り組み
長田昌彦
日本原子力学会誌 アトモス, Volume：63, First page：6, Last page：7, 2021 - ラフネス計測による割れ目の形成に関する情報取得の試み
村上 和哉, 長田 昌彦, 藤井 幸泰, 松下 智昭
12回岩の力学国内シンポジウム講演論文集,, First page：855, Last page：860, 2008
岩の力学連合会 - 常時微動観測による岩塊の振動特性の検討
茂木 秀則; 高橋 学; 長田 昌彦; 荒井 進吾
First page：53, Last page：58, 2008 - 白浜砂岩の破壊強度における中間主応力の影響に関する実験的考察
宮崎 裕一, 長田 昌彦, 高橋 学
12回岩の力学国内シンポジウム講演論文集, First page：559, Last page：562, 2008
岩の力学連合会 - 割れ目の幾何学的構造と水みちに関する一考察; 屋久島花崗岩の露頭を例として
長田 昌彦, 高橋 学, 松下 智昭
12回岩の力学国内シンポジウム講演論文集, First page：959, Last page：964, 2008
岩の力学連合会 - Development of Shear-Flow-Visualization Coupling Test Apparatus and Its Data Analysis
PARK Hyuck; OSADA Masahiko; WATANABE Kunio
Journal of the Japan Society of Engineering Geology, Volume：49, Number：5, First page：266, Last page：276, 2008
A new type of shear-flow-visualization coupling test apparatus was developed to investigate the hydraulic conductivity alteration and fracturing process of intact soft sedimentary rock (pumice tuff) during shear deformation. The design of new apparatus allows both direct shear test and hydraulic conductivity test to be carried out at the same time. In addition, it is possible to observe the specimen surface during experiment. Shear/normal stress, volumetric flow rate and deformation (shear/normal displacements) can be obtained directly. Area of visible fractures and local normal displacement of fractured specimen were obtained by the image processing technique. With these obtained values, especially, the area of visible fractures and the local normal displacement of fracture revealed the advantage of new apparatus for the shear-flow coupling. This study shows one of new directions on the shear-flow coupling experiment of rock.
Japan Society of Engineering Geology, Japanese
DOI：https://doi.org/10.5110/jjseg.49.266
DOI ID：10.5110/jjseg.49.266, ISSN：0286-7737, CiNii Articles ID：110007008450, CiNii Books ID：AN00026635 - A new method for strain measurement of rock with conductive rubber
MATSUSHITA Tomoaki; OSADA Masahiko; TAKEMURA Takato
Japanese Geotechnical Journal, Volume：3, Number：4, First page：287, Last page：294, 2008
In this study, a new strain measurement using conductive rubber is proposed. Initially, the influence of temperature change, heat generation, deformation rate, and deformation history against the resistance variation of the conductive rubber were examined. The results showed that the resistance variation of conductive rubber is strongly influenced by the deformation history. Furthermore, the applicability and validity of the strain measurement with the conductive rubber was checked with soft sedimentary rock samples. The experimental work indicated that the relation between the resistance and strain of the conductive rubber is linear. And, this linear relationship covers well from loading point to beyond the failure point of the soft rocks. Therefore, this strain measurement method by conductive rubber is suitable for strain measurement of soft rock samples in the laboratory. In addition, this method has strong possibility to measure the strain of soft materials, such as soil, clay, etc., because of the low elasticity of the conductive rubber.
The Japanese Geotechnical Society, Japanese
DOI：https://doi.org/10.3208/jgs.3.287
DOI ID：10.3208/jgs.3.287, ISSN：1880-6341, CiNii Articles ID：80019996449 - 稲田花崗岩の天然の割れ目系の性質と成因について
藤井 幸泰; 高橋 学; 長田 昌彦; 竹村 貴人
平成20年度研究発表会講演論文集, Volume：20, First page：187, Last page：188, 2008
Japanese
CiNii Articles ID：110007074799, CiNii Books ID：AN10522065 - Evaluating the deformation behaviour of Shirahama sandstone in moisture transfer process
Aung Ko Ko Soe; Osada, M; Win; T. T. N
The 12th Japan symposium on Rock Mechanics, Volume：5, Number：2, First page：385, Last page：390, 2008
Japanese Committee for Rock Mechanics - ラフネス計測による割れ目の形成に関する情報取得の試み
村上 和哉; 長田 昌彦; 藤井 幸泰; 松下 智昭
12回岩の力学国内シンポジウム講演論文集,, First page：855, Last page：860, 2008 - 常時微動観測による岩塊の振動特性の検討
茂木 秀則; 高橋 学; 長田 昌彦; 荒井 進吾
12回岩の力学国内シンポジウム講演論文集, Volume：12th(CD-ROM), First page：53, Last page：58, 2008
岩の力学連合会
ISSN：1883-1486, J-Global ID：200902206310202648 - 白浜砂岩の破壊強度における中間主応力の影響に関する実験的考察
宮崎 裕一; 長田 昌彦; 高橋 学
12回岩の力学国内シンポジウム講演論文集, First page：559, Last page：562, 2008 - 割れ目の幾何学的構造と水みちに関する一考察; 屋久島花崗岩の露頭を例として
長田 昌彦; 高橋 学; 松下 智昭
12回岩の力学国内シンポジウム講演論文集, First page：959, Last page：964, 2008 - 岩石のせん断 透水 可視化同時試験装置の開発とそのデータ解析法
朴 赫; 長田 昌彦; 渡邉 邦夫
応用地質, Volume：49, Number：5, First page：266, Last page：276, 2008
A new type of shear-flow-visualization coupling test apparatus was developed to investigate the hydraulic conductivity alteration and fracturing process of intact soft sedimentary rock (pumice tuff) during shear deformation. The design of new apparatus allows both direct shear test and hydraulic conductivity test to be carried out at the same time. In addition, it is possible to observe the specimen surface during experiment. Shear/normal stress, volumetric flow rate and deformation (shear/normal displacements) can be obtained directly. Area of visible fractures and local normal displacement of fractured specimen were obtained by the image processing technique. With these obtained values, especially, the area of visible fractures and the local normal displacement of fracture revealed the advantage of new apparatus for the shear-flow coupling. This study shows one of new directions on the shear-flow coupling experiment of rock.
Japan Society of Engineering Geology, Japanese
DOI ID：10.5110/jjseg.49.266, ISSN：0286-7737, CiNii Articles ID：110007008450, CiNii Books ID：AN00026635 - 導電性ゴムを用いた岩石のひずみ計測方法の適用性検討
松下 智昭; 長田 昌彦; 竹村 貴人
地盤工学ジャーナル, Volume：3, Number：4, First page：287, Last page：294, 2008
In this study, a new strain measurement using conductive rubber is proposed. Initially, the influence of temperature change, heat generation, deformation rate, and deformation history against the resistance variation of the conductive rubber were examined. The results showed that the resistance variation of conductive rubber is strongly influenced by the deformation history. Furthermore, the applicability and validity of the strain measurement with the conductive rubber was checked with soft sedimentary rock samples. The experimental work indicated that the relation between the resistance and strain of the conductive rubber is linear. And, this linear relationship covers well from loading point to beyond the failure point of the soft rocks. Therefore, this strain measurement method by conductive rubber is suitable for strain measurement of soft rock samples in the laboratory. In addition, this method has strong possibility to measure the strain of soft materials, such as soil, clay, etc., because of the low elasticity of the conductive rubber.
The Japanese Geotechnical Society, Japanese
DOI：https://doi.org/10.3208/jgs.3.287
DOI ID：10.3208/jgs.3.287, ISSN：1880-6341, CiNii Articles ID：80019996449 - Fundamental study on mineralogical and chemical properties of rock fractures as a pathway of groudwater: case study for Yakushima granite
長田昌彦、松下智昭、竹村貴人、高橋学
Report of Comprehensive Open Innovation Center, Saitama University, Volume：1, Number：1, First page：144, Last page：151, 2008
Rock fractures as a pathway of groundwater have been altered either physically or chemically, and filled with minerals or other fillings depending on circumstances. In this paper, we describe mineralogical and chemical properties of fractures observed in Yakushima granite, along which the wall rocks are solidified. Microscopic observations and EPMA analyses of the solidified part show that cracks are filled with fragments of different kinds in matrix of amorphous calcium carbonate. It is presumed that the calcium carbonate was provided from corals uplifted. This is supported by the results of the radioactive dating that the ages of fillings are always younger than those of the coral.
埼玉大学地域オープンイノベーション, Japanese
ISSN：1883-8278, CiNii Articles ID：120001493953 - イラン，バム遺跡の修復に向けた国際協力
渡邉邦夫・長田 昌彦・小口千明
土と基礎, Volume：55, Number：3, First page：132, Last page：136, 2007 - Effects of dynamic friction on sliding behavior of block in DDA
Dong, P. H; Osada, M
First page：129, Last page：134, 2007 - イラン，バム遺跡の修復に向けた国際協力
渡邉邦夫; 長田 昌彦; 小口千明
土と基礎, Volume：55, Number：3, First page：132, Last page：136, 2007 - Preliminary consideration for analyzing ground deformation due to fault movement
Osada,M; Taniyama,H
First page：113, Last page：120, 2005 - Geotechnical description and JGS engineering classification system for rock mass
Osada, M; Funato, A; Yoshinaka, R; Ito, H
Volume：1, Number：1, First page：7, Last page：17, 2005 - 除荷過程を考慮したせん断ー透水実験
小西 亮平, 長田 昌彦, 山辺 正, 佐々木 泰
平成17年度研究発表会講演論文集, First page：341, Last page：3, 2005
日本応用地質学会
- 土木技術者のための岩盤力学（2023年度改訂版）［基礎編］第1章 岩盤力学における地質
長田昌彦,太田岳洋,升元一彦
土木学会岩盤力学委員会, Dec. 2023
Total pages：911
ISBN：9784810610642 - Rock Mechanics and Engineering Geology in Volcanic Fields
Editors: Takehiro Ohta, Takatoshi Ito and Masahiko Osada
CRC Press/Balkema, UK, Dec. 2022
Total pages：478
ISBN：9781032276571 - 新・関東の地盤 増補地盤情報データベースと地盤モデル（2014年版）
八戸 昭一、林 武司、和田 理恵、長田 昌彦
地盤工学会, Jun. 2014
Total pages：237
ISBN：9784886440952 - 地盤調査―基本と手引き―【改訂版】
地盤工学会地盤調査規格基準委員会WG12地盤調査―基本と手引き‐改訂ワーキンググループ
地盤工学会, Sep. 2013
Total pages：288
ISBN：9784886440945 - 地盤調査の方法と解説
地盤調査規格・基準委員会 改正案作成委員会
地盤工学会, Mar. 2013
Total pages：1300
ISBN：9784886440914 - 設計用地盤定数の決め方 岩盤編
「設計用地盤定数の決め方 岩盤編 」編集委員会
地盤工学会, Sep. 2007
Total pages：279
ISBN：9784886440785 - 不連続変形法（DDA)
日本計算工学会編,大西有三,佐々木猛,Gen-Hua Shi,不連続性岩盤解析実用化委員会
丸善, May 2005
Total pages：198
ISBN：9784621075913
- 減圧回復過程を利用した岩石の透気異方性に関する研究
小林 璃桜; 長田 昌彦
Sep. 2024
Japanese, Oral presentation - 地下坑道における長期的な環境変化に関するデータ取得とその考察
広瀬 朱音; 長田 昌彦
Sep. 2024
Japanese, Oral presentation - 岩石供試体の飽和プロセスに関する基礎研究
��成 結菜; 長田 昌彦
Sep. 2024
Japanese, Oral presentation - Long-term Measurements in Engineering Geology
Masahiko Osada
14th Asian Regional Conference of IAEG, Universiti Teknologi Malaysia (UTM) Kuala Lumpur, Malaysia, Feb. 2024, [Invited], [International conference] - 地下軍需工場跡地内の坑道壁面環境モニタリング
長田 昌彦,青木 新之介,広瀬 朱音,吉成 結菜,小林 璃桜,大寺 裕也
日本応用地質学会令和5年度研究発表会講演論文集, Oct. 2023, [Domestic conference] - 外気圧の周期的変動に対する岩石ブロック内の気圧応答
長田昌彦, 大沢光司, クリスティーナ・プツリ, 野澤海人
令和4年度研究発表会講演論文集, Oct. 2022, [Domestic conference] - 長期モニタリングによる多孔質凝灰岩の割れ目開口幅の季節変化.
長田昌彦, 船引耕平, 高橋優輔
令和3 年度研究発表会講演論文集, Oct. 2021, [Domestic conference] - 長期観測により確認された降雨に伴う凝灰岩開口割れ目の変位挙動
長田昌彦・小澤一稀・船引耕平・弓 明義
令和2年度研究発表会 講演論文集, Oct. 2020, [Domestic conference] - スイス・モンテリ地下研究所での間隙空気圧測定
長田昌彦・竹村貴人・富樫陽太・五嶋壮太
令和元年度研究発表会 講演論文集, Oct. 2019, [Domestic conference] - Streaming data processing for Multi-Parameter Phased Array Weather Radar (MP-PAWR) data
Takeshi Maesaka, Kaori Kieda, Koyuru lwanami, Nobuhiro Takahash, Hiroshi Hanado, Katsuhiro Nakagawa, Fumihiko Mizutani, Tomoo Ushio, Masahiko Osada
日本気象学会秋季大会, May 2019, [Domestic conference] - マルチパラメータフェーズドアレイ気象レーダ（MP-PAWR）送信波測定について
花土弘,川村誠治,堀江宏昭,中川勝広,高橋暢宏,牛尾知雄,水谷文彦,岩波越,前坂剛,長田昌彦,大朝由美子
秋季大会, Oct. 2018, [Domestic conference] - マルチパラメータフェーズドアレイ気象レーダ(MP-PAWR)のストリームデータ処理について
前坂剛,木枝香織,岩波越,高橋暢宏,花土弘,中川勝広,水谷文彦,牛尾知雄,長田昌彦
秋季大会, Oct. 2018, [Domestic conference] - 岩石の毛管現象プロセスに与える影響要因の検討
長田昌彦・辰巳茅
日本応用地質学会平成30年度研究発表会講演論文集, Oct. 2018, [Domestic conference] - 二酸化炭素ファインバブル水と岩石の中和反応に関する実験的研究
竹村 貴人; 鈴木 健一郎; 長田 昌彦 & 濱本 昌一郎
日本応用地質学会平成28年度研究発表会講演論文集, Oct. 2016, [Domestic conference] - Effect of drying process on deformation behavior in mudstone
Amunugama, B. C.; Osada, M.; Illankoon, T. N. & Maekawa, K.
2016 JSCE summar symposium, Sep. 2016, [Domestic conference] - 地上からの複数の物理探査手法による石灰岩ブロックの分布状況の推定
松下 智昭; 升元 一彦 & 長田 昌彦
土木学会年次講演会, Sep. 2016, [Domestic conference] - 水の過剰供給による地盤内間隙空気圧の発生に関する基礎研究
長田 昌彦 & 佐々木 理弦
2016年度日本地球惑星科学連合大会, May 2016, [Domestic conference] - 地質災害と地下水
長田 昌彦
2015 年度日本水文科学会学術大会，公開合同シンポジウム, Oct. 2015, [Invited], [Domestic conference] - 水浸に伴う岩石内間隙空気圧の発生とその等価管路モデルを用いた解釈
長田 昌彦,中原 壮一朗,武藤 圭佑,高橋 学,竹村 貴人
平成27年度研究発表会講演論文集, Sep. 2015, [Domestic conference] - TRT探査による地上からの地質構造評価の適用
松下 智昭,升元 一彦,長田 昌彦
年次講演会, Sep. 2015, [Domestic conference] - 堆積岩の乾燥に伴う変形挙動に関する検討 (3) 堆積岩の間隙構造と乾燥変形挙動との関係に関する検討
多田 浩幸,齋藤 亮,熊坂 博夫,長田 昌彦,竹村 貴人,前川恵輔
2015年秋の大会, Sep. 2015, [Domestic conference] - 堆積岩の乾燥に伴う変形挙動に関する検討 (2)堆積岩の異方性を考慮した応力－ひずみ関係に関する検討
多田 浩幸、齋藤 亮、熊坂 博夫、長田 昌彦、竹村 貴人、前川恵輔
2015年春の大会, Mar. 2015, [Domestic conference] - 6. Immersion-induced pore air pressure buildup and its interpretation using equivalent channel model
Osada Masahiko; Nakahara Soichiro; Muto Keisuke; Takahashi Manabu; Takemura Takato
2015
2015 - 2015, Japanese - 各種地質材料の二酸化炭素の中和処理能力の評価に関する実験的研究
竹村 貴人、鈴木 健一郎、高橋 隼人、長田 昌彦
平成26年度研究発表会講演論文集, Oct. 2014, [Domestic conference] - 堆積岩の初期乾燥変形挙動と空気侵入値の関係について
長田 昌彦, Thilini Nuwanradha Illankoon, 大塚 絢香
平成26年度研究発表会講演論文集, Oct. 2014, [Domestic conference] - The use of triaxial strain gauge and laser displacement meter for drying shrinkage measurement: a comparative analysis
Thilini Nuwanradha Illankoon, Ayaka Otsuka and Masahiko Osada
平成26年度全国大会 第69回年次学術講演会, Sep. 2014, [Domestic conference] - 堆積岩の乾燥に伴う変形挙動に関する検討 (1) 堆積岩の力学的異方性と弾性波速度との関係に関する検討
多田 浩幸、齋藤 亮、熊坂 博夫、長田 昌彦、竹村 貴人、前川恵輔
2014年春の大会, Mar. 2014, [Domestic conference] - P15. Experimental study of capacity of geomaterials for neutralizing CO_2
Takemura T.; Suzuki K.; Takahashi H.; Osada M.
2014
2014 - 2014, Japanese - Importance of Geology in civil engineering: a suggestion through our experiences and experiments
Osada, M.
ICEEHE, Dec. 2013, [International conference] - 割れ目充填物中に観察される層状構造とその14C年代値
松下 智昭,長田 昌彦
日本応用地質学会平成25年度研究発表会講演論文集, Oct. 2013, [Domestic conference] - Anisotropic behavior of a sedimentary rock in changing saturation
Adikaram, A. & Osada, M.
SLJRC, Apr. 2013, [International conference] - P42. ^<14>C age of layered fillings in rock fracture
Matsushita Tomoaki; Osada Masahiko
2013
2013 - 2013, Japanese - 割れ目充填物を用いた過去の津波再来周期の推定法に関する一考察
長田 昌彦,松下 智昭, 高橋 学
日本応用地質学会平成24年度研究発表会講演論文集, Nov. 2012, [Domestic conference] - Effect of specimen height on deformation and elastci wave velocity of Tage tuff during drying
Illankoon, T. N.,Osada, M., Adikaram, N. M.
土木学会年次学術講演会，名古屋大学, Sep. 2012, [Domestic conference] - 堆積岩の間隙構造の定量化に関する検討
多田 浩幸,熊坂 博夫,齋藤 亮,長田 昌彦, 前川 恵輔
土木学会年次学術講演会，名古屋大学, Sep. 2012, [Domestic conference] - 白浜砂岩の水浸に伴う内部空隙圧の発生と水質の変化
長田 昌彦,矢口 亮介, 竹村 貴人
第47回地盤工学会研究発表会, 八戸工業大学, Jul. 2012, [Domestic conference] - 58. Possibility for estimation of repeat intervals in past tsunamis using fracture fillings in rock
Osada Masahiko; Matsushita Tomoaki; Takahashi Manabu
2012
2012 - 2012, Japanese - 常時微動計測による岩塊の振動特性の検討
茂木秀則; MULMI Sagar Prasad; 長田昌彦
2012
2012 - 2012 - 屋久島花崗岩中のカルサイト充填割れ目の微視構造から類推されるその充填環境
長田 昌彦, 松下 智昭, 須永 俊之
日本応用地質学会平成23年度研究発表会講演論文集, Oct. 2011, [Domestic conference] - Effect of microbubbles existence on permeability of Berea sandstone
Sudisman, R. A., Osada, M., Takemura, T. & Takahashi, M.
The 13th International Summer Symposium, Aug. 2011, [Domestic conference] - P31. Filling environment of rock fractures with calcite in Yakushima granite on the basis of microscopic observations
Osada Masahiko; Matsushita Tomoaki; Sunaga Toshiyuki
2011
2011 - 2011, Japanese - 乾燥に伴う軟岩の弾性波速度の異方性について
長田昌彦、Thilini Nuwanradha Illankoon、Nayana Madurya Adikaram
平成22年度研究発表会講演論文集, Oct. 2010, [Domestic conference] - 離水サンゴ近傍の岩石割れ目内を充填する炭酸塩鉱物の微視的観察
松下智昭、長田昌彦、高橋学
平成22年度研究発表会講演論文集, Oct. 2010, [Domestic conference] - 発達する割れ目の幾何学的構造が透水特性に与える影響
安昶完、長田昌彦、朴赫、高橋学
平成22年度研究発表会講演論文集, Oct. 2010, [Domestic conference] - 離水サンゴ近傍における硬化した割れ目とビーチロックの特徴
松下智昭、長田昌彦、高橋学
平成22年度土木学会年次講演会論文概要集, Sep. 2010, [Domestic conference] - Anisotropic properties of Tage tuff based on ultrasonic wave velocity measurements
ADIKARAM Mudiyanselage Adikaram Nayana Madurya, OSADA Masahiko
Geo-Kanto2010, Aug. 2010, [Domestic conference] - Fluid pathways in Berea sandstone by image processing technique
AHN Changwan, TAKAHASHI Manabu, OSADA Masahiko, PARK Hyuck, FUJII Yukiyasu
Joint Meeting of Korean and Japanese Geological Societies, Aug. 2010, [International conference] - Anisotropic deformation behaviour of Tage tuff in 1D drying condition
ADIKARAM Mudiyanselage Adikaram Nayana Madurya, ILLANKOON Mudiyanselage Thilini Nuwanradha Illankoon, OSADA Masahiko
12th JSCE International Summer Symposium, Jul. 2010, [Domestic conference] - 日干し煉瓦の短期的強度の発現機構-堆積岩の乾燥変形実験からの類推-
長田昌彦
連合大会, May 2010, [Domestic conference] - 地圏環境共生および高度地圏素材活用を目的とした技術体系グリーン・ジオテクノロジーの現状と将来展開
渡邉邦夫、長田昌彦
連合大会, May 2010, [Domestic conference] - 17. Microscopic Observations for carbonate within rock fractures in the vicinity of uplifted corals
Matsushita Tomoaki; Osada Masahiko; Takahashi Manabu
2010
2010 - 2010, Japanese - 離水サンゴ近傍に存在する硬化した割れ目の特徴について
長田昌彦、松下智昭、高橋学、藤井幸泰、竹村貴人
日本応用地質学会平成21年度研究発表会講演論文集, Oct. 2009, [Domestic conference] - 各種岩石における反射スペクトルと含水比の関係
松下智昭、長田昌彦、萩原育夫、近藤はるか
日本応用地質学会平成21年度研究発表会講演論文集, Oct. 2009, [Domestic conference] - Evaluation of pore structure of Berea Sandstone by image processing technique
Chang Ahn and Manabu Takahashi and Masahiko Osada
韓日ジョイント岩盤工学シンポジウム, Oct. 2009, [International conference] - 離水サンゴ近傍における割れ目充填物のAMS年代測定
長田昌彦、松下智昭、高橋学
平成21年度土木学会年次講演会論文概要集, Sep. 2009, [Domestic conference] - A try of triaxial shear-flow coupling test with prism specimen and a verification of fracture shape by using CT Image
朴赫、長田昌彦、高橋学、熊谷聡之
平成21年度資源・素材関係学協会合同秋季大会, Sep. 2009, [Domestic conference] - 負圧状態における白浜砂岩の水分移動と変形の連成挙動
長田昌彦、Aung Ko Ko Soe、高橋学
平成21年度資源・素材関係学協会合同秋季大会, Sep. 2009, [Domestic conference] - 11. Characteristics of solidified fractures in the vicinity of uplifted corals
Osada Masahiko; Matsushita Tomoaki; Takahashi Manabu; Fujii Yukiyasu; Takemura Takato
2009
2009 - 2009, Japanese - 離水サンゴ近傍における割れ目充填物のAMS年代測定
長田 昌彦, 松下 智昭, 高橋 学
第64回年次講演会論文概要集, 2009, [Domestic conference] - P31. Method for characterizing fractures and water-conducting features in different scales 1
Takeuchi Shinji; Saegusa Hiromitsu; Shiozaki Isao; Hosoya Shin-ichi; Osada Masahiko
平成20年度研究発表会講演論文集, 2008, 日本応用地質学会
2008 - 2008, Japanese - 稲田花崗岩の天然の割れ目系の性質と成因について
藤井 幸泰, 高橋 学, 長田 昌彦, 竹村 貴人
平成20年度研究発表会講演論文集, 2008, 日本応用地質学会
2008 - 2008 - Shear-flow-visualization coupling test and triaxial shear-flow coupling test for soft sedimentary rock
Park, H; Osada, M; Sasaki, T; Takahashi, M; Kumagai, S
2008
2008 - 2008 - Evaluating the deformation behaviour of Shirahama sandstone in moisture transfer process
Aung Ko Ko Soe; Osada, M; Win; T. T. N
2008
2008 - 2008 - 岩石の破壊挙動評価のための画像解析手法に関する研究
安 昶完,長田 昌彦,高橋 学
第62回年次学術講演会, 2007, [Domestic conference] - 一面せん断変形下における堆積軟岩の透水特性に関する研究
熊谷 聡之, 長田 昌彦 & 朴 赫
第62回年次学術講演会, 2007, [Domestic conference] - A new method for strain measurement of rock with conductive rubber
Mathushita, T., Osada, M.
The 6th Asian regional conferenece on Geohazards in Engineering Geology, 2007, [International conference] - P57 Deformational behavior of soft sedimentary rock in drying process
Osada Masahiko; Iwanaga Norikazu; Soe Aung Ko Ko
2006, 日本応用地質学会
2006 - 2006, Japanese - 除荷過程を含む堆積軟岩の変形と浸透特性に関する実験的研究
新井 謙太, 小西 亮平, 長田 昌彦 & 山辺 正
第62回年次学術講演会, 2006, [Domestic conference] - 亀裂の発生と変形を伴う岩石の透水特性
遠藤 孝志, 山辺 正 & 長田 昌彦
第61回年次学術講演会, 2006, [Domestic conference] - 割れ目の発生・進展・すべりに伴う堆積軟岩の透水特性の変化
Hyuck, P., 長田 昌彦 & 庄司 健二
第61回年次学術講演会, 2006, [Domestic conference] - イラン・バム遺跡における日干し煉瓦と目地の力学的物性値の推定
村上 和哉, 長田 昌彦, 渡邉 邦夫 & 小口 千明
第61回年次学術講演会, 2006, [Domestic conference] - 71. Evaporation measurements from tunnel walls just after excavation
Osada Masahiko; Watanabe Kunio
2005, 日本応用地質学会
2005 - 2005, Japanese - P18. Drying Induced Deformation in Opalinus Clay
Soe Aung Ko Ko; Osada Masahiko
2005, 日本応用地質学会
2005 - 2005, English - P19. Application of DDA to the Evaluation of the Restoration Work on Unbaked Brick Ruins
Kameda Takashi; Osada Masahiko; Watanabe Kunio
2005, 日本応用地質学会
2005 - 2005, Japanese - P22. Testing of a new apparatus for the measurement of both single shear and permeability characteristics of rock under high-speed digital image sensor
Park Hyuck; Osada Masahiko; Sasaki Tai
2005, 日本応用地質学会
2005 - 2005, Japanese - 割れ目系に着目したダムサイトにおける水理地質構造の検討（１）－割れ目系の構造発達史から読み取れる透水性評価－
川越 健, 長田 昌彦
2004, 日本応用地質学会
2004 - 2004 - 割れ目系に着目したダムサイトにおける水理地質構造の検討（２）－カーテングラウティング結果を取り入れた三次元的な透水性評価－
長田 昌彦, 川越 健, Aung Ko Ko Soe
2004, 日本応用地質学会
2004 - 2004 - 孔内蒸発量計測に基づく軟岩の透水性推定に関する研究
小西 亮平 & 長田 昌彦
第59回年次学術講演会, 2004, [Domestic conference] - 岩盤接着工法による軟岩のせん断補強効果に関する実験的研究
亀田 卓志, 長田 昌彦, 梶山 敏也 & 袴田 弘容
第59回年次学術講演会, 2004, [Domestic conference] - スイス・モンテリ地下研究所でのEvaporation Logging実験計画
長田 昌彦, Meier, E., Bossart, P., 森田 豊, 渡辺 邦夫
2003, 日本応用地質学会
2003 - 2003 - 岩盤接着工法によるせん断補強効果に関する実験的研究
長田 昌彦, 塗木 裕之, 梶山 敏也 & 山口 健二
第58回年次学術講演会, 2003, [Domestic conference] - 稲田花崗岩の圧裂引張試験と破面観察
長田 昌彦 & 関和 伸幸
2001, 日本応用地質学会
2001 - 2001 - 花崗岩の変形挙動における時間の効果に関する検討
長田 昌彦 & 山辺 正
第56回年次学術講演会, 2001, [Domestic conference] - 花崗岩の破壊ひずみとその応用地質学的な意義
長田 昌彦 & 吉中 龍之進
2000, 日本応用地質学会
2000 - 2000 - 破壊ひずみに着目した稲田花崗岩の破壊特性に関する実験的研究
樫野 誠, 長田 昌彦 & 吉中 龍之進
第55回年次学術講演会, 2000, [Domestic conference] - 火山角礫岩の強度・変形特性に関する実験的研究－礫率と寸法効果について－
濵野 久美, 佐藤 俊則, 長田 昌彦 & 吉中 龍之進
第55回年次学術講演会, 2000, [Domestic conference] - 稲田花崗岩のひずみ速度依存性とクラック発達過程
長田 昌彦 & 吉中 龍之進
1999, 日本応用地質学会
1999 - 1999 - ひずみ速度に依存した花崗岩中のクラック発達過程
長田 昌彦 & 吉中 龍之進
第54回年次学術講演会, 1999, [Domestic conference] - 熱収縮チューブを利用した岩石のひずみ計測方法の検討
浜野 久美, 吉中 龍之進, 山辺 正 & 長田 昌彦
第54回年次学術講演会, 1999, [Domestic conference] - 顕微鏡下岩石変形実験による微小割れ目のせん断過程の観察
長田 昌彦 & 武石 裕幸
第46回応用力学連合講演会論文集, 1997
1997 - 1997 - 三軸圧縮下における岩石の浸透特性に関する研究
長田 昌彦, 薄井 正幸 & 鈴木 尊
第32回研究発表会, 1997, [Domestic conference] - せん断に伴う岩石の浸透特性の変化と淡路島の地下水変動
長田 昌彦, 黒岩 育子, 徳永 朋祥, 石橋 弘道 & 栢木 智明
第52回年次学術講演会, 1997, [Domestic conference] - せん断変形下における岩石の浸透特性に関する研究
鈴木 尊, 長田 昌彦 & 薄井 正幸
第52回年次学術講演会, 1997, [Domestic conference] - 花崗岩類中の水みち形成過程の考察 釜石鉱山550mレベル坑道を例として
長田 昌彦, 鈴木 尊 & 武石 裕幸
地球惑星科学関連学会1997年合同大会予稿集, 1997, [Domestic conference] - 変形下における岩石の透水性に関する研究
鈴木 尊 & 長田 昌彦
第51回年次学術講演会, 1996, [Domestic conference] - 顕微鏡下変形実験装置の開発とその適用
武石 裕幸 & 長田 昌彦
第51回年次学術講演会, 1996, [Domestic conference] - 堆積軟岩における疲労特性とクリープ特性の比較
長田 昌彦
第51回年次学術講演会, 1996, [Domestic conference] - 堆積軟岩の動的強度とクリープ特性について
長田 昌彦
第3回岩盤システム工学シンポジウム, 1995, [Domestic conference] - 堆積軟岩における動的破壊強度の時間依存性に関する検討
長田 昌彦 & 吉中 龍之進
第50回年次学術講演会, 1995, [Domestic conference] - 地史を考慮した割れ目分類に関する基礎研究
長田 昌彦
1994, 日本応用地質学会
1994 - 1994 - 堆積軟岩の時間依存性挙動時における間隙水圧変化について
長田 昌彦
第49回年次学術講演会, 1994, [Domestic conference] - 繰り返し応力下での岩石の間隙水圧挙動
長田 昌彦
第48回年次学術講演会, 1993, [Domestic conference] - 一軸圧縮下の岩石の変形挙動における微小割れ目の影響について
長田 昌彦, 長町 貴弘 & 東海枝 圭司
第46回年次学術講演会, 1991, [Domestic conference]
■ Affiliated academic society
- Jun. 2020 - Jun. 2024, Japan Society of Engineering Geology
- Jul. 2022, International Asscociation for Engineering Geology and the Environment
- International Society for Rock Mechanics and Rock Engineering
- American Rock Mechanics Association
- American Geophysical Union
- Japan Geoscience Union
- Development of a method to evaluate permeability of rock using barometric fluctuation
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 01 Apr. 2020 - 31 Mar. 2024
長田昌彦, 竹村貴人,富樫陽太, Saitama University
Grant amount(Total)：18070000, Direct funding：13900000, Indirect funding：4170000
Grant number：20H02238 - 水分量変化に伴う地下岩盤の物性変化に関する研究（Ⅱ）
日本原子力研究開発機構，清水建設, 31 Jan. 2012
長田昌彦, 前川恵輔,熊坂博夫,多田浩幸
Grant amount(Total)：490000 - 水分量変化に伴う地下岩盤の物性変化に関する研究
日本原子力研究開発機構, 31 Jan. 2011
長田昌彦, 前川恵輔
Grant amount(Total)：930000, Direct funding：930000 - 地下水流動経路としての割れ目からの各種情報取得とその評価に関する基礎研究
原子力環境整備促進・資金管理センター, 02 Jun. 2008 - 24 Mar. 2009
長田昌彦, 小口千明・高屋康彦
Grant amount(Total)：5000000, Direct funding：5000000 - 礫分布特性を考慮した火山角礫岩の力学特性とそれに基づく原位置岩盤の評価手法の検討
2001 - 2002
長田昌彦
Grant amount(Total)：2500000, Direct funding：2500000
Grant number：13750466 - Study on permeability and hydrodynamic dispersion in jointed rock
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 1995 - 1997
ODA Masanobu; SUZUKI Kenichiro; IWANO Masaharu; IIBOSHI Shigeru; OSADA Masahiko; SATO Kuniaki, Saitama University
Grant amount(Total)：1700000, Direct funding：1700000
1) A theoretical as well as a numerical study has been carried out with special emphasis on developing a basic under-standing of how crack geometry influences hydraulic phenomena such as permeability and hydrodynamic dispersion in cracked bodies. The permeability tenser kappa_is formulated in terms of length. aperture and orientation of cracks plus one more non-dimensional scalar lambda depending on conneetivity among cracks. By extending the Robinson's formula, a general expression for lambda is given as a function of density and anisotropy of existing cracks. Dispersion tenser D_ consists of two different sources. The first comes from the fact that each tracer is forced to move along cracks the directions of which deviate from the mean path. The second comes from non-uniform distribution of hydraulic head throughout a cracked body. The second source has increasing importance not only when crack density is low, but also when crack arrangement is highly anisotropic. The distribution of head becomes extremely non-uniform, especially when overall hydraulic head gradient is parallel to the preferred orientation of cracks.
2) Rock structure can be qualitatively, as well as generally. described by using tensors. In order to show how such a tensor is useful for the description purpose of rock structure, a crack tensor is introduced as an index measure for the rock structure by joints and faults, and is discussed in detail to clarify the geometrical meaning. Four cylindrical specimens of granite, which are immersed in hot water of 90 for 0,180,1030 and 2000 days respectively, are examined to see if the crack tensors can be actually determined by purely microscopic observation. Using thus determined crack tensors for the granite specimens. permeability tensors are estimated in good agreement with experimentally determined permeability values.
Grant number：07555443 - 割れ目の運動学的評価と考慮した岩盤疲労のメカニズムに関する研究
1996 - 1996
Grant amount(Total)：900000, Direct funding：900000
Grant number：08750601 - Study on groundwater flow and transport properties considering the structural change of fracture system in rock masses.
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 1995 - 1996
WATANABE Kunio; TOKUNAGA Tomochika; OSADA Masahiko, Saitama University
Grant amount(Total)：6800000, Direct funding：6800000
It is commonly accepted that fluid flow in granitic rocks mainly occurs through discontinuities such as joints, fractures and cracks. However all of discontinuities are not always the conduits. How do the fluid flow path form? The investigations of fracture system in Stripa mine, Aspo Hard Rock Laboratory and Kamaishi Mine suggest that fluid flow path mainly relates to the displacement along the fractures and in situ stress regime.
The effect of shear deformation on hydraulic properties of Miocene sandstone, Shirahama Ss, was investigated in drained triaxial compression experiments. Flow pump method developed by Olsen et al. (1985) is adopted in order to measure the hydraulic conductivity. The water to permeate was run out to two directions, that is the loading direction and the vertical to loading. These tests show that hydraulic conductivities at the peak stress for both tests increase about three times as large as the initial ones. The difference of hydraulic properties due to flow direction is now in consideration.
In order to examine the deformational and hydraulic properties of rock with fracture system, we developed the triaxial testing machine, in which the surface microstructure of specimen can be observed in a motion using a stereoscopic microscope. In this present study we first showed some experimental results in uniaxial compression test. The shearing process on fractures experimentally generated is simultaneously observed by stereoscopic microscope. The rotation and cutting of bridge, sliding on fracture plane and opening of fracture occur. Furthermore it is clear that these structures are continued inside the specimen by thin section observation. Next, permeability tests under triaxial compression were conducted for fractured Shirahama sandstone. The tests show that the slide along fractures mainly occur after the peak stress and hydraulic conductivity abruptly increase.
Grant number：07454119 - 内部構造変化を考慮した不均質な岩盤の力学挙動に関する研究
1994 - 1994
Grant amount(Total)：6600000, Direct funding：6600000
Grant number：06452266 - 地史を考慮した割れ目分類に関する研究
1993 - 1993
Grant amount(Total)：700000, Direct funding：700000
Grant number：05740312 - 礫を含む軟質な岩盤の不均質体としての力学挙動に関する研究
1993 - 1993
Grant amount(Total)：2000000, Direct funding：2000000
Grant number：05650458 - Coupled Heat-Stress-Fluid Flow Mecahnism of Rock Mass.
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for General Scientific Research (C), 1992 - 1993
YAMABE Tadashi; OSADA Masahiko, Saitama University
Grant amount(Total)：1900000, Direct funding：1900000
A freezing and thawing test has been conducted in a laboratory using a rectangular specimen with a freezing pipe perpendicular to the rock surface. The aim of the test is an investigation into the conduction of heat in a rock with the goal of understanding the deformation through temperature change. The temperature distributions around the freezing pipe were simulated numerically using homogenous anisotropic continuum assumptions. The numerical procedures by finite element method is composed of coupled heat-stress-fluid flow constitutive equations. This model was compared with the observation results, yielding the following conclusions.
1)The deformation of the rock around the freezing pipe is mainly due to two processes, the thermal expansion of water and contraction of rock materials ;
2)the thawing conditions have a clear effect on the patterns of strain distributions ; and
3)the rock behaves as a homogeneous continuum with respect to heat flow.
Grant number：04650431 - A study of dynamic strength of rock masses related to microcrack propagation.
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for General Scientific Research (B), 1991 - 1992
YOSHINAKA Ryunoshin; OSADA Masahiko; YAMABE Tadashi, Saitama University
Grant amount(Total)：6100000, Direct funding：6100000
The foundations of many important structures such as nuclear power plants are often composed of soft sedimentary rocks and subjected to cyclic loading caused by earthquakes and so on. Consequently the capacity of these foundations is required for the stabibility of those rocks under not only static but also cyclic loading.
The purpose of this research is to investigate the relation between static and dynamic strength, mechanism of failure under cyclic loading and viscoelastic properties of soft sedimentary rocks. First, the triaxial compression experiments and stepwise cyclic loading experiments were performed under consolidated and undrained conditions. Comparing the results of two kinds of experiments, we obtained that the ratio of dynamic strength to static strength in total stress expression is from 1.0 to 1.5 but 1.0 in effective stress expression. This means that it is only different in the behavior of pore water pressure.
Cyclic fatigue experiments were performed to investigate the behavior of pore pressure by every stress cycle. As a result, it is found that the behavior of pore pressure is systematically changed and that this change is described by two quantities, that is, the difference between maximum and minimum values in pore pressure caused by a stress cycle and a lag of phase difference on pore pressure cycles for stress cycles. It is thought that failure of rocks results from the brittle process involving the cumulative growth of internal cracks. We interpret that this behavior results from crack initiation and propagation. In fact, internal cracks, with orientations parallel to a maximum compression and ultimate fracture plane, were microscopically observed from rock specimens after failure.
In addition, stress relaxation experiments showed that the peaks of relaxation spectra dispersedly distributed, dependent on temperature. These results are very meaningful to establish the constitutive equations involving the effect of crack growth.
Grant number：03452204 - 成因により異なる岩石の強度特性とそのメカニズムに関する微視的研究
1990 - 1990
Grant amount(Total)：600000, Direct funding：600000
Grant number：02855124 - 地下水流動経路としての割れ目からの各種情報取得とその評価に関する基礎研究
原子力環境整備促進・資金管理センター
長田昌彦, 小口千明・高屋康彦
Grant amount(Total)：5000000, Direct funding：5000000 - 地下水流動経路としての割れ目からの各種情報取得とその評価に関する基礎研究
原子力環境整備促進・資金管理センター
長田昌彦, 小口千明・高屋康彦
Grant amount(Total)：5000000, Direct funding：5000000 - 長大岩盤斜面の安定化対策に検する基礎研究
サンコーコンサルタント
長田昌彦
Grant amount(Total)：2500000, Direct funding：2500000 - モルタル充填による岩盤割れ目の補強効果
ロックマスター協会
長田昌彦
Grant amount(Total)：1500000, Direct funding：1500000 - MTSを用いた高圧下三軸圧縮試験
応用地質㈱
長田昌彦
Grant amount(Total)：1200000, Direct funding：1200000 - 反射スペクトル計測による岩石情報の整理
アーススキャンニング研究会
長田昌彦, 萩原育夫・近藤はるか・松下智昭
Grant amount(Total)：500000, Direct funding：500000