Performance information

• 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]
  Scientific journal
  DOI：https://doi.org/10.1016/j.ijrmms.2024.105984
  DOI ID：10.1016/j.ijrmms.2024.105984, ORCID：173296072
• A method of determining unsteady air permeability of rock
  Yota Togashi; Masahiko Osada
  Engineering Geology and Geotechnics: Building for the Future, Proceedings of the Conference EUROENGEO 2024, First page：423, Last page：432, Oct. 2024, [Reviewed]
  For geological disposal of radioactive waste and large-scale collapse of rock slopes due to heavy rain fall, it is significantly important to determine the water transport in the rock mass including unsaturated zones. To precisely predict the two-phase flow of air and water in rock pore spaces, both the hydraulic conductivity and gas permeability must be accurately identified. Most existing methods estimate the air permeability from the differential pressure under steady-state conditions. There are still few methods for evaluating air permeability under unsteady state conditions. This study proposes a method of identifying the ever-changing permeability with time and pressure using a linearized governing equation for air permeability in porous media. This method is based on an exact solution of the linear diffusion equation and requires that air pressure be measured at three different coordinates to approximate the second-order partial derivative with respect to the coordinates. To validate the method, we compared the exact solution derived with the results of air permeability laboratory tests on granite and conglomerate in previous studies. After confirming that the exact solution well represented the results of previous experiments, the unsteady air permeability of the rock was estimated from the results of the same experiments using the proposed method. As a result, it was confirmed that not only can the air permeability be identified with the same accuracy as the steady-state method, but also the unsteady air permeability, which varies with pressure, can be identified.
  University of Zagreb Faculty of Civil Engineering, International conference proceedings
  DOI：https://doi.org/10.5592/co/euroengeo.2024.115
  DOI ID：10.5592/co/euroengeo.2024.115
• Fundamental study on slope failures, failure Shapes, and frequency distribution using sandpile experiment
  Weerahannadige Sachintha Fernando; Keita Yanagidaira; Teppei Kato; Yota Togashi
  Japanese Geotechnical Society Special Publication, Volume：10, Number：18, First page：650, Last page：655, May 2024, [Reviewed]
  The Japanese Geotechnical Society, Scientific journal
  DOI：https://doi.org/10.3208/jgssp.v10.os-7-09
  DOI ID：10.3208/jgssp.v10.os-7-09, eISSN：2188-8027
• Unsaturated Strength of Tage Tuff and Its Water Retention Drying Curve　　　　　　　　　　　　　　　
  Haruhiko Kotabe; Yota Togashi; Ken Hatakeyama; Masahiko Osada
  Zairyo/Journal of the Society of Materials Science, Japan, Volume：73, Number：3, First page：212, Last page：219, Mar. 2024, [Reviewed]
  Scientific journal
  DOI：https://doi.org/10.2472/jsms.73.212
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85184568571&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85184568571&origin=inward
  DOI ID：10.2472/jsms.73.212, ISSN：0514-5163, eISSN：1880-7488, SCOPUS ID：85184568571
• Experimental study of frictional resistance influences on tunnel face stability　　　　　　　　　　　　　　　
  R. Kawanoue; T. Yagihashi; Y. Togashi; M. Osada
  IOP Conference Series: Earth and Environmental Science, Volume：1124, Number：1, 2023, [Reviewed]
  International conference proceedings
  DOI：https://doi.org/10.1088/1755-1315/1124/1/012103
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85146556639&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85146556639&origin=inward
  DOI ID：10.1088/1755-1315/1124/1/012103, ISSN：1755-1307, eISSN：1755-1315, SCOPUS ID：85146556639
• 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, [Reviewed]
  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
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85146632350&origin=inward
  DOI ID：10.1088/1755-1315/1124/1/012121, ISSN：1755-1307, eISSN：1755-1315, SCOPUS ID：85146632350
• ボアホールジャッキ試験による異方性岩盤のヤング率解析法　　　　　　　　　　　　　　　
  川久保昌平; 大野宏和; 松井裕哉; 富樫陽太; 谷 和夫; 加藤猛士
  Volume：17, Number：3, First page：393, Last page：400, Sep. 2022, [Reviewed]
  Japanese, Scientific journal
  DOI：https://doi.org/10.3208/jgs.17.393
  DOI ID：10.3208/jgs.17.393
• Method for Measuring Three-Dimensional Strain Tensor of Rock Specimen Using Strain Gauges　　　　　　　　　　　　　　　
  Mamoru Kikumoto; Yota Togashi
  Rock Mechanics and Rock Engineering, 2022, [Reviewed]
  Scientific journal
  DOI：https://doi.org/10.1007/s00603-022-02849-0
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85127547979&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85127547979&origin=inward
  DOI ID：10.1007/s00603-022-02849-0, ISSN：0723-2632, eISSN：1434-453X, SCOPUS ID：85127547979
• Influence of End Restraints on Strain Responses of Anisotropic Tuff During Triaxial Compression　　　　　　　　　　　　　　　
  Yota Togashi; Mamoru Kikumoto; Kazuo Tani; Koichi Hosoda; Koji Ogawa
  Rock Mechanics and Rock Engineering, 2022, [Reviewed]
  Scientific journal
  DOI：https://doi.org/10.1007/s00603-022-02793-z
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85124946700&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85124946700&origin=inward
  DOI ID：10.1007/s00603-022-02793-z, ISSN：0723-2632, eISSN：1434-453X, SCOPUS ID：85124946700
• Determination of 12 orthotropic elastic constants for rocks　　　　　　　　　　　　　　　
  Yota Togashi; Mamoru Kikumoto; Kazuo Tani; Koichi Hosoda; Koji Ogawa
  International Journal of Rock Mechanics and Mining Sciences, Volume：147, Nov. 2021, [Reviewed]
  Scientific journal
  DOI：https://doi.org/10.1016/j.ijrmms.2021.104889
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85114791470&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85114791470&origin=inward
  DOI ID：10.1016/j.ijrmms.2021.104889, ISSN：1365-1609, SCOPUS ID：85114791470
• Evaluating changes in the degree of saturation in excavation disturbed zones using a stochastic differential equation　　　　　　　　　　　　　　　
  Yota Togashi; Kazuki Mizuo; Masahiko Osada; Tadashi Yamabe; Hiroshi Kameya
  Computers and Geotechnics, Sep. 2021, [Reviewed]
  Wiley, Scientific journal
  DOI：https://doi.org/10.1002/essoar.10507973.2
  DOI ID：10.1002/essoar.10507973.2, ORCID：100827890
• Numerical method of tunnel face pressure estimation considering progressive failure due to excavation　　　　　　　　　　　　　　　
  Yota Togashi; Iguchi Shota; Masahiko Osada; Ryo Kawanoue
  IOP Conference Series: Earth and Environmental Science, Volume：833, Number：1, Sep. 2021, [Reviewed]
  International conference proceedings
  DOI：https://doi.org/10.1088/1755-1315/833/1/012157
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85115162285&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85115162285&origin=inward
  DOI ID：10.1088/1755-1315/833/1/012157, ISSN：1755-1307, eISSN：1755-1315, SCOPUS ID：85115162285
• Deformation characteristics of sedimentary rock due to continuous changes of moisture content in wetting process　　　　　　　　　　　　　　　
  Yota Togashi; Takanobu Imano; Masahiko Osada
  IOP Conference Series: Earth and Environmental Science, Volume：703, Number：1, Apr. 2021, [Reviewed]
  International conference proceedings
  DOI：https://doi.org/10.1088/1755-1315/703/1/012021
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85105306702&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85105306702&origin=inward
  DOI ID：10.1088/1755-1315/703/1/012021, ISSN：1755-1307, eISSN：1755-1315, SCOPUS ID：85105306702
• Principal strain rotation of anisotropic tuff due to continuous water-content variation　　　　　　　　　　　　　　　
  Yota Togashi; Takanobu Imano; Masahiko Osada; Koichi Hosoda; Koji Ogawa
  International Journal of Rock Mechanics and Mining Sciences, Volume：138, First page：104646, Last page：104646, Feb. 2021, [Reviewed]
  Elsevier {BV}, English, Scientific journal
  DOI：https://doi.org/10.1016/j.ijrmms.2021.104646
  DOI ID：10.1016/j.ijrmms.2021.104646, ISSN：1365-1609, ORCID：86676642
• Determination of anisotropic deformability parameters of tuff by a single triaxial test　　　　　　　　　　　　　　　
  Yota Togashi; M. Kikumoto; K. Tani
  16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2019, 2020, [Reviewed]
  Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, English, International conference proceedings
  SCOPUS ID：85084944450
• A study of deep-seated landslide and its deformation behavior due to rock bridge by centrifuge model test　　　　　　　　　　　　　　　
  Togashi, Y; Yuasa, T; Hasegawa, A; Kawagoe, T; Kasuya, Y; Yamada, Y
  Japanese Geotechnical Journal, Volume：14, Number：2, First page：77, Last page：93, Jun. 2019, [Reviewed]
  Japanese, Scientific journal
  DOI：https://doi.org/10.3208/jgs.14.77
  DOI ID：10.3208/jgs.14.77
• Deformation anisotropy of sedimentary rock sampled from deep seabed near subduction zone　　　　　　　　　　　　　　　
  Yota Togashi; Mamoru Kikumoto; Kazuo Tani; Koichi Hosoda; Koji Ogawa
  5th ISRM Young Scholars' Symposium on Rock Mechanics and International Symposium on Rock Engineering for Innovative Future, YSRM 2019, First page：163, Last page：168, 2019, [Reviewed]
  International Society for Rock Mechanics and Rock Engineering, English, International conference proceedings
  SCOPUS ID：85088437637
• Non-axisymmetric and/or non-elementary response of anisotropic tuff in axisymmetric, elementary triaxial test
  Yota Togashi; Mamoru Kikumoto; Kazuo Tani; Koichi Hosoda; Koji Ogawa
  E3S Web of Conferences, Volume：92, First page：02008, Last page：02008, 2019, [Reviewed]
  Specimens of triaxial tests ordinarily response as element in the axisymmetric condition, and it is theoretically correct assumption. However, for anisotropic rocks, the axisymmetric condition is not always satisfied because incremental relationships between stresses and strains are not coaxial. In addition, such rock specimen often shows non-uniform deformation behaviors due to end frictions. As the reason, the influence of end restraints on deformation behaviors of anisotropic rocks during triaxial compression is much greater than that of isotropic one. In this study, the variations in the stress-strain relationships of anisotropic tuff due to the condition of end restraints are investigated. The results of four consolidated drained triaxial tests with measuring the strain tensor demonstrated that the axial and volumetric strains were not influenced by whether sliding mechanism and Teflon sheets are installed at the end of specimens or not; meanwhile, the shear components of the strain tensor and the inclinations of principal strain orientations are widely varied owing to the end restraints.
  EDP Sciences, Scientific journal
  DOI：https://doi.org/10.1051/e3sconf/20199202008
  DOI ID：10.1051/e3sconf/20199202008, eISSN：2267-1242
• Determining anisotropic elastic parameters of transversely isotropic rocks through single torsional shear test and theoretical analysis　　　　　　　　　　　　　　　
  Yota Togashi; Mamoru Kikumoto; Kazuo Tani
  Journal of Petroleum Science and Engineering, Volume：169, First page：184, Last page：199, Oct. 2018, [Reviewed]
  Elsevier B.V., English, Scientific journal
  DOI：https://doi.org/10.1016/j.petrol.2018.05.051
  DOI ID：10.1016/j.petrol.2018.05.051, ISSN：0920-4105, SCOPUS ID：85047636174
• Detection of deformation anisotropy of tuff by a single triaxial test on a single specimen　　　　　　　　　　　　　　　
  Yota Togashi; Mamoru Kikumoto; Kazuo Tani; Koichi Hosoda; Koji Ogawa
  International Journal of Rock Mechanics and Mining Sciences, Volume：108, First page：23, Last page：36, Aug. 2018, [Reviewed]
  Elsevier Ltd, English, Scientific journal
  DOI：https://doi.org/10.1016/j.ijrmms.2018.04.054
  DOI ID：10.1016/j.ijrmms.2018.04.054, ISSN：1365-1609, SCOPUS ID：85047868449
• Anisotropic elastic parameters of soft sedimentary rock by a single triaxial test　　　　　　　　　　　　　　　
  Yota Togashi; Mamoru Kikumoto; Kazuo Tani; Koichi Hosoda; Koji Ogawa
  Zairyo/Journal of the Society of Materials Science, Japan, Volume：67, Number：3, First page：338, Last page：345, Mar. 2018, [Reviewed]
  Society of Materials Science Japan, Japanese, Scientific journal
  DOI：https://doi.org/10.2472/jsms.67.338
  DOI ID：10.2472/jsms.67.338, ISSN：1880-7488, SCOPUS ID：85044174657
• Assessment of anisotropic deformation properties of tuff by a single test on a single specimen　　　　　　　　　　　　　　　
  Yota Togashi; Mamoru Kikumoto; Kazuo Tani; Koichi Hosoda; Koji Ogawa
  Geomechanics and Geodynamics of Rock Masses - Selected Papers from the 2018 European Rock Mechanics Symposium, EUROCK 2018, First page：591, Last page：598, 2018, [Reviewed]
  CRC Press/Balkema, English, International conference proceedings
  SCOPUS ID：85063614585
• 堆積軟岩の三軸試験と変形異方性の特定方法に与える端面摩擦の影響　　　　　　　　　　　　　　　
  富樫陽太; 菊本統; 谷和夫; 細田光一; 小川浩司
  Volume：74, Number：1, First page：50, Last page：62, Jan. 2018, [Reviewed]
  Japanese, Scientific journal
  DOI：https://doi.org/10.2208/jscejge.74.50
  DOI ID：10.2208/jscejge.74.50
• Determination and its verification of anisotropic stiffness of tuff by a single triaxial test　　　　　　　　　　　　　　　
  TOGASHI Yota; KIKUMOTO Mamoru; TANI Kazuo; HOSODA Koichi; OGAWA Koji
  Japanese Geotechnical Journal, Volume：12, Number：1, First page：123, Last page：134, Mar. 2017, [Reviewed]
  A new cap with a slider structure was implemented to triaxial testing apparatus for measuring elementary behaviors of an anisotropic material. Top of a cylindrical specimen could displace to perpendicular directions against the loading axis and frictionless boundary conditions were given by the cap. Using this apparatus, six small strain tensor components of tuff including bedding plane were investigated during both uniaxial and triaxial compression tests. The results of uniaxial tests, using two specimens sampled in parallel and perpendicular orientations to the bedding planes, demonstrated tangent Young’s modulus in the bedding direction is 1.5 times larger than that in the perpendicular direction. The anisotropy of Tage tuff assuming transversely isotropic elasticity is identified via proposed method by a single triaxial test using each specimen with inclined bedding plane at 15° or 45°. The results demonstrated that the dominant orientation of the anisotropy agreed well with that of the bedding plane, and anisotropic stiffness values obtained from a single triaxial test were close to those by uniaxial tests.
  The Japanese Geotechnical Society, Japanese
  DOI：https://doi.org/10.3208/jgs.12.123
  DOI ID：10.3208/jgs.12.123, CiNii Articles ID：130005519969
• An Experimental Method to Determine the Elastic Properties of Transversely Isotropic Rocks by a Single Triaxial Test　　　　　　　　　　　　　　　
  Yota Togashi; Mamoru Kikumoto; Kazuo Tani
  ROCK MECHANICS AND ROCK ENGINEERING, Volume：50, Number：1, First page：1, Last page：15, Jan. 2017, [Reviewed]
  English, Scientific journal
  DOI：https://doi.org/10.1007/s00603-016-1095-9
  DOI ID：10.1007/s00603-016-1095-9, ISSN：0723-2632, eISSN：1434-453X, J-Global ID：201702219191754669, Web of Science ID：WOS:000392293300001
• NON-UNIFORM DEFORMATIONS AND VARIATIONS OF YIELD STRENGTHS OF ANISOTROPIC SOLIDS DUE TO BOUNDARY CONDITIONS DURING PLANE STRAIN COMPRESSION　　　　　　　　　　　　　　　
  Yota Togashi; Mamoru Kikumoto; Kazuo Tani
  Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering), Volume：72, Number：3, First page：283, Last page：293, Sep. 2016, [Reviewed]
   Non-uniform and non-symmetric deformation properties of anisotropic solids are discussed by 2D finite element simulations of both plane strain testing on isotropic and transversely isotropic solids. The results demonstrated that non-uniform deformation, which can not be estimated in isotropic solids, are observed in anisotropic solids due to both the boundary conditions and anisotropic stiffnesses. Then, the apparent yield strength of the specimen which are defined by the local stresses which reach Coulomb's yield criterion is investigated. In the case which anisotropy of Young's modulus is two times different due to the orientation of anisotropy, yield strengths were underestimated by 44%.
  Japan Society of Civil Engineers, Japanese, Scientific journal
  DOI：https://doi.org/10.2208/jscejge.72.283
  DOI ID：10.2208/jscejge.72.283, CiNii Articles ID：130005416211
• Tunnel monitoring system with wireless sensor network　　　　　　　　　　　　　　　
  Tsuno, K; Nakamura, T; Togashi, Y; Kamachi, H; Ooki, Y
  International Journal of the JSRM, Volume：12, Number：1, First page：15, Last page：18, Jun. 2016, [Reviewed]
  English, Scientific journal
  DOI：https://doi.org/10.11187/ijjsrm.12.1_15
  DOI ID：10.11187/ijjsrm.12.1_15
• 線路下横断構造物の施工に関するボルト締結鋼管の実物大曲げ試験と数値解析　　　　　　　　　　　　　　　
  中村智哉; 富樫陽太; 津野究; 岡野法之; 小山幸則
  Volume：72, Number：1, First page：39, Last page：52, Jun. 2016, [Reviewed]
  Japanese, Scientific journal
  DOI：https://doi.org/10.2208/jscejte.72.39
  DOI ID：10.2208/jscejte.72.39
• DETERMINATION OF DEFORMATION PROPERTIES FOR ANISOTROPIC ROCK MASSES BY IN-SITU TORSIONAL SHEAR TESTING　　　　　　　　　　　　　　　
  Togashi, Y; Tani, K; Kikumoto, M
  J. Japan Society of Civil Engineers, Ser. C, Volume：71, Number：3, First page：241, Last page：253, Sep. 2015, [Reviewed]
  Deformation characteristics of rock masses are often significantly anisotropic due to discontinuities e.g. sedimentary planes and joints. Anisotropic properties of rock masses are commonly obtained by several triaxial tests using rock cores sampled to different orientations, but which is costly and time consuming. In this study in-situ torsional shear test for rock masses is proposed by the authors. Anisotropic deformation properties can be obtained by fewer tests than the conventional testing method. In this paper, for developing testing methods, a method of determining constitutive parameters for transversely isotropic rock masses is proposed. In this proposed method, the directions of anisotropy are determined by the strain responses under isotropic consolidation and 5 elastic parameters of transversely isotropic rocks are determined by both strain responses during isotropic consolidation and the distributed stress responses during torsional shearing.
  Japan Society of Civil Engineers, Japanese, Scientific journal
  DOI：https://doi.org/10.2208/jscejge.71.241
  DOI ID：10.2208/jscejge.71.241, ISSN：2185-6516, CiNii Articles ID：130005100281
• A method to identify deformation anisotropy of rock masses by triaxial testing　　　　　　　　　　　　　　　
  TOGASHI Yota; KIKUMOTO Mamoru; TANI Kazuo
  Japanese Geotechnical Journal, Volume：10, Number：2, First page：201, Last page：211, Jun. 2015, [Reviewed]
  Mechanical behaviors of rock masses often become anisotropic due to discontinuities. Mechanical properties of anisotropic rock masses are previously investigated by triaxial tests using boring cores sampled to from different orientations, but which is costly and time consuming. In this study, a new triaxial testing method to characterize deformation properties of anisotropic rock masses is proposed. This method can identify the directions of anisotropy by the directions of principal strains during isotropic consolidation and also can determine 5 elastic parameters of a transversely isotropic rock by the relationships between stresses and strains during both isotropic consolidation and axial compression.
  The Japanese Geotechnical Society, Japanese
  DOI：https://doi.org/10.3208/jgs.10.201
  DOI ID：10.3208/jgs.10.201, ISSN：1880-6341, CiNii Articles ID：130005086572
• 異方性岩盤の変形特性を特定する三軸試験の提案　　　　　　　　　　　　　　　
  富樫陽太; 菊本統; 谷和夫
  First page：204-209, Jan. 2015, [Reviewed]
  Japanese
• Bending tests of the box form roof for underpass tunneling methods　　　　　　　　　　　　　　　
  Yota Togashi; Tomoya Nakamura; Noriyuki Okano; Kiwamu Tsuno
  6th Japan-China Geotechnical Symposium, SJGS 2015, Volume：1, Number：8, First page：16, Last page：21, 2015, [Reviewed]
  Japanese Geotechnical Society, English, International conference proceedings
  DOI：https://doi.org/10.3208/jgssp.JPN-03
  DOI ID：10.3208/jgssp.JPN-03, SCOPUS ID：84959327224
• Non triaxial behaviors of rock masses assuming transversely isotropic elasticity in a triaxial compression test　　　　　　　　　　　　　　　
  TOGASHI Yota; KIKUMOTO Mamoru; TANI Kazuo
  Japanese Geotechnical Journal, Volume：9, Number：4, First page：479, Last page：493, Dec. 2014, [Reviewed]
  Rock masses often show anisotropic mechanical behavior due to discontinuity or sequence of mineral particle. In a triaxial test, the deformations of these types of rock masses show non triaxial behavior because a condition of axial symmetry is not satisfied. In this study, in order to clarify the deformation properties of transversely isotropic body which is applied for sedimentary rocks by some researchers, two cases of analysis of elements for a triaxial test is conducted. The one is the analysis for the condition which the directions of principal stresses are coaxial with the loading directions and the other analysis is for the condition which the directions of principal strains are coaxial with the loading directions. The results demonstrated two main conclusions: in the case of the former type of analysis, the directions of principal strain are inclined from loading direction; on the other hand, in the case of the latter type of analysis, the directions of principal stress are inclined from loading direction.
  The Japanese Geotechnical Society, Japanese, Scientific journal
  DOI：https://doi.org/10.3208/jgs.9.479
  DOI ID：10.3208/jgs.9.479, ISSN：1880-6341, CiNii Articles ID：130004944114
• 面内等方弾性体を仮定した岩が三軸試験で示す非三軸性　　　　　　　　　　　　　　　
  富樫陽太; 菊本統; 谷和夫
  Jul. 2013
  Japanese
• 面内等方性を仮定した岩盤の三軸応力下の変形特性と異方剛性　　　　　　　　　　　　　　　
  富樫陽太; 菊本統; 谷和夫
  May 2013
  Japanese
• PROPOSAL OF A NEW IN-SITU TORSIONALLY SHEAR TESTING METHOD AND ANALYSIS OF TEST RESULTS FOR ANISOTROPIC ROCK MASSES　　　　　　　　　　　　　　　
  Yota Togashi; Kazuo Tani; Mamoru Kikumoto
  PROCEEDINGS OF THE 5TH INTERNATIONAL YOUNG GEOTECHNICAL ENGINEERS' CONFERENCE (IYGEC 2013), Volume：2, First page：387, Last page：390, 2013, [Reviewed]
  English, International conference proceedings
  DOI：https://doi.org/10.3233/978-1-61499-297-4-387
  DOI ID：10.3233/978-1-61499-297-4-387, Web of Science ID：WOS:000333366000092
• Analysis for variations of test results of rock shear tests　　　　　　　　　　　　　　　
  Yota Togashi; Kazuo Tani
  ISRM Regional Symposium - 7th Asian Rock Mechanics Symposium, ARMS 2012, First page：535, Last page：543, 2012
  International Society for Rock Mechanics, English, International conference proceedings
  SCOPUS ID：85056234506
• Relationships between strength proerties obtained by rock shear tests and those by block shear tests　　　　　　　　　　　　　　　
  Yota Togashi; Kazuo Tani
  ISRM International Symposium - 6th Asian Rock Mechanics Symposium, ARMS 2010, 2010
  International Society for Rock Mechanics, English, International conference proceedings
  SCOPUS ID：85056216140

• Influence of specimen shape on new simple shear test using rock prism specimen　　　　　　　　　　　　　　　
  I. Sato; Y. Togashi; H. Kotabe; K. Hatakeyama; M. Osada
  58th US Rock Mechanics / Geomechanics Symposium 2024, ARMA 2024, Jun. 2024, [Reviewed]
  DOI：https://doi.org/10.56952/ARMA-2024-0470
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85201166051&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85201166051&origin=inward
  DOI ID：10.56952/ARMA-2024-0470, SCOPUS ID：85201166051
• EFFECT OF SPECIMEN SIZE ON SIMPLE SHEAR TESTS OF ROCK PRISM SPECIMENS　　　　　　　　　　　　　　　
  佐藤礁; 富樫陽太; 小田部晏彦; 長田昌彦
  岩盤力学に関するシンポジウム講演集(Web), Volume：50th, 2024
  J-Global ID：202402288484194761
• STRENGTH PROPERTIES OF UNSATURATED TAGE TUFF　　　　　　　　　　　　　　　
  小田部晏彦; 富樫陽太; 畠山健; 長田昌彦
  岩盤力学に関するシンポジウム講演集(Web), Volume：50th, Jan. 2024, [Reviewed]
  J-Global ID：202402291066608421
• Application of LiDAR and depth camera in labolatory experiments of face stability and slope failure　　　　　　　　　　　　　　　
  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(Web), Volume：72, Number：1, 2024
  ISSN：2435-5348, J-Global ID：202402232449975015
• 非対称要素を用いたすべり曲線における切羽安定問題の土圧理論　　　　　　　　　　　　　　　
  小林祐貴; 富樫陽太; 長田昌彦
  Volume：79th, 2024
  J-Global ID：202402220618275624
• NEW SIMPLE SHEAR TEST FOR ROCKS BY TORSIONAL SHEARING　　　　　　　　　　　　　　　
  富樫陽太; 平沢梨帆; 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(Web), Volume：49th, 2023
  J-Global ID：202302211005617177
• EXPERIMENTS ON TUNNEL FACE COLLAPSE PROGRESSION AND MODELING OF ARCH ACTION　　　　　　　　　　　　　　　
  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(Web), Volume：49th, 2023
  J-Global ID：202302288192429160
• 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
  Volume：49th, 2023
  J-Global ID：202302274901382014
• INFLUENCE OF MOISTURE CONTENT ON MOHR-COULOMB FAILURE CRITERIA FOR SOFT SEDIMENTARY ROCK　　　　　　　　　　　　　　　
  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(Web), Volume：48th, 2022
  J-Global ID：202202251374440600
• INFLUENCE OF THE EARTH COVERINGS AND SHEAR RESISTANCE ANGLE ON THE STABILITY OF TUNNEL FACE　　　　　　　　　　　　　　　
  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(Web), Volume：48th, 2022
  J-Global ID：202202290788540589
• Experimental study of unsaturated mechanical properties of Berea sandstone.　　　　　　　　　　　　　　　
  小砂子優貴; 富樫陽太; 畠山健; 川之上諒; 長田昌彦
  土木学会全国大会年次学術講演会(Web), Volume：77th, 2022
  J-Global ID：202302297095817969
• Development of a new friction reduction materials in underpass tunnel construction by R&C method　　　　　　　　　　　　　　　
  平沢梨帆; 富樫陽太; 中村智哉; 井口翔太; 柏井皓登
  土木学会全国大会年次学術講演会(Web), Volume：77th, 2022
  J-Global ID：202302279423833277
• Influence of advection and diffusion on water content changes in tuff deformation during the drying process　　　　　　　　　　　　　　　
  RANAWEERA Neranjan; 富樫陽太
  地盤工学会関東支部発表会(CD-ROM), Volume：19th, 2022
  J-Global ID：202302241441983156
• 切羽崩壊の進行に伴うすべり線の形状変化を考慮したアーチ作用のモデル化と実験的検討　　　　　　　　　　　　　　　
  川之上諒; 富樫陽太
  Volume：19th, 2022
  J-Global ID：202302246610674996
• A METHOD OF DETERMINING ORTHOGONAL ANISOTROPIC ELASTICITY OF SOFT SEDIMENTARY ROCK BY THREE UNIAXIAL TESTS　　　　　　　　　　　　　　　
  佐藤晴海; 富樫陽太; 菊本統; 谷和夫; 細田光一; 小川浩司
  岩の力学国内シンポジウム講演論文集(CD-ROM), Volume：15th, 2021
  ISSN：1883-1486, J-Global ID：202102224245615750
• FACE PRESSURE THEORY AND EXPERIMENTAL VERIFICATION CONSIDERING PROGRESSIVE FAILURE　　　　　　　　　　　　　　　
  井口翔太; 富樫陽太; 長田昌彦; 川之上諒
  岩の力学国内シンポジウム講演論文集(CD-ROM), Volume：15th, 2021
  ISSN：1883-1486, J-Global ID：202102238621071656
• トンネル引抜き実験による地山の摩擦抵抗が切羽安定性に及ぼす影響　　　　　　　　　　　　　　　
  川之上諒; 八木橋辰紀; 富樫陽太
  Volume：18th, 2021
  J-Global ID：202202225749778477
• Description of saturation distribution of EDZ by stochastic differential equation　　　　　　　　　　　　　　　
  水尾華月; 富樫陽太; 長田昌彦; 相澤恵悟; 亀谷裕志
  地盤工学研究発表会(Web), Volume：56th, 2021
  J-Global ID：202202244907828431
• A METHOD FOR DETERMINATION OF ANISOTROPIC PARAMETERS OF ROCK MASSES ASSUMING TRANSVERSELY ISOTROPIC BODY BY IN-SITU TORSIONAL SHEAR TEST FOR ROCK MASSES
  富樫 陽太; 菊本 統; 谷 和夫
  Volume：42, First page：262, Last page：267, 09 Jan. 2014
  Japanese
  ISSN：1880-7623, CiNii Articles ID：40020163228

• 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
  Jan. 2025
• 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
  Jan. 2025
  Oral presentation
• 原位置岩盤試験データベースによる岩盤せん断試験の統計解析　　　　　　　　　　　　　　　
  船山稜真; 富樫陽太; 小田部晏彦; 谷和夫
  Nov. 2024
  Japanese, Oral presentation
• Deformation anisotropy of sedimentary rock sampled from deep seabed near subduction zone　　　　　　　　　　　　　　　
  Togashi Y; Kikumoto M; Tani K; Hosoda K; Ogawa K
  ISRM Int. sym. YSRM 2019 & REIF 2019, Dec. 2019, [International conference]
  English, Oral presentation
• Pore air pressure measurement at Mont Terri Rock Laboratory, Switzerland　　　　　　　　　　　　　　　
  Osada M; Takemura T; Togashi Y; Goshima S
  ISRM Int. sym. YSRM 2019 & REIF 2019, Dec. 2019, [International conference]
  English, Poster presentation
• Determination of anisotropic deformability parameters of tuff by a single triaxial test　　　　　　　　　　　　　　　
  Togashi Y; Kikumoto M; Tani K
  Oct. 2019, [International conference]
  English, Oral presentation
• Anisotropic deformation characteristics of soft mudstone via measuring full strain tensor components during triaxial compression　　　　　　　　　　　　　　　
  Togashi Y; Kikumoto M; Tani K; Hosoda K; Ogawa K
  ISRM Congress 2019, Sep. 2019, [International conference]
  English, Oral presentation
• Non-axisymmetric and/or non-elementary response of anisotropic tuff in axisymmetric, elementary triaxial test　　　　　　　　　　　　　　　
  Togashi Y; Kikumoto M; Tani K; Hosoda K; Ogawa K
  Jun. 2019, [International conference]
  English, Oral presentation
• Triaxial and Torsional Shear Tests for Anisotropic Rock Masses　　　　　　　　　　　　　　　
  Togashi Y
  ISRM Int. Sym. 10th Asian Rock Mechanics Symposium, Oct. 2018, [Invited], [International conference]
  English, Invited oral presentation
• Assessment of anisotropic deformation properties of a tuff by a single test on a single specimen,　　　　　　　　　　　　　　　
  Togashi, Y; Kikumoto, M; Tani, K; Hosoda, K; Ogawa, K
  EUROCK2018, May 2018, [International conference]
  English, Oral presentation
• Stiffness anisotropy in sedimentary rocks: New innovation　　　　　　　　　　　　　　　
  Togashi, Y
  One-Day Workshop on Advanced Laboratory Soil Testing, May 2018, [Invited], [International conference]
  English, Invited oral presentation
• 非開削推進工法による地表面への影響を検討するための小型土槽実験　　　　　　　　　　　　　　　
  板谷創平; 富樫陽太; 仲山貴司; 岡野法之
  Jan. 2018, [Domestic conference]
  Japanese
• 端面摩擦が堆積軟岩の応力ひずみ特性に与える影響　　　　　　　　　　　　　　　
  富樫陽太; 菊本統; 谷和夫; 細田光一; 小川浩司
  Jan. 2018, [Domestic conference]
  Japanese
• エレメント推進を模した矩形断面の土槽掘削実験　　　　　　　　　　　　　　　
  板谷創平; 富樫陽太; 仲山貴司; 岡野法之
  Nov. 2017, [Domestic conference]
  Japanese
• A new testing apparatus to excavate rectangular section for under pass tunnel construction　　　　　　　　　　　　　　　
  Togashi, Y; Nakayama, T; Itaya, S; Hondo, T; Okano, N
  GEOMATE2017, Nov. 2017, [International conference]
  English, Oral presentation
• 矩形断面掘削時の地表面変位応答の予測　　　　　　　　　　　　　　　
  西山和宣; 仲山貴司; 富樫陽太; 岡野法之
  Jan. 2017, [Domestic conference]
  Japanese
• 層理を含む凝灰岩の三軸応力下における非軸対称変形と異方剛性の測定　　　　　　　　　　　　　　　
  富樫陽太; 菊本統; 谷和夫; 細田光一; 小川浩司
  Jan. 2017, [Domestic conference]
  Japanese
• 矩形断面掘削時の土圧変化を考慮した応力非一様解放に伴う地表面変位応答　　　　　　　　　　　　　　　
  西山和宣; 仲山貴司; 富樫陽太; 岡野法之
  Nov. 2016, [Domestic conference]
  Japanese
• A method of triaxial testing for determining constitutive parameters of anisotropic rocks using a single specimen　　　　　　　　　　　　　　　
  Togashi, Y; Kikumoto, M; Tani, K
  ARMA 50th US Rock Mech. sym., Jun. 2016, [International conference]
  English, Oral presentation
• トンネル・地下構造物の変状監視における無線センサの活用　　　　　　　　　　　　　　　
  中村智哉; 津野究; 富樫陽太; 蒲池秀矢; 大木裕久
  Jan. 2016, [Domestic conference]
  Japanese
• 異方性岩盤の変形特性を特定する三軸試験　　　　　　　　　　　　　　　
  富樫陽太; 菊本統; 谷和夫
  Jan. 2015, [International conference]
  English
• A method for determining anisotropic parameters for transversely isotropic rocks by in-situ torsional shear test　　　　　　　　　　　　　　　
  Togashi, Y; Kikumoto, M; Tani, K
  ISRM Int. Sym. 2014 & 8th Asian Rock Mech. Sym., Oct. 2014, [International conference]
  English
• 原位置岩盤ねじりせん断試験による面内等方弾性体を仮定した岩盤の変形特性の異方性の特定方法　　　　　　　　　　　　　　　
  富樫陽太; 菊本統; 谷和夫
  Jan. 2014, [Domestic conference]
  Japanese
• Proposal of analysis methods for test results of the new in-situ rock mass test　　　　　　　　　　　　　　　
  Togashi, Y; Tani, K
  14th JSCE Summer Sym., Sep. 2012, [International conference]
  English
• 積層供試体の弾性波速度計測による不連続面での遅延時間の検討　　　　　　　　　　　　　　　
  富樫陽太; 谷和夫; 岡田哲実; 佐藤浩章
  Jan. 2012, [Domestic conference]
  Japanese
• Analysis for variations of test results of rock shear tests　　　　　　　　　　　　　　　
  Togashi, Y; Tani, K
  ISRM Int. Sym. 2012 & 7th Asian Rock Mech. Sym., 2012, [International conference]
  English
• Delay times of elastic waves at discontinuities measured in laminated specimens　　　　　　　　　　　　　　　
  Togashi, Y; Tani, K; Okada, T; Sato, H
  GEOMAT2011, Sep. 2011, [International conference]
  English
• Statistical analysis of strength properties by rock shear tests based on rock mass classification systems of JGS　　　　　　　　　　　　　　　
  Togashi, Y; Tani, K
  4th Korea-Japan Geotech. Workshop, Jul. 2011, [International conference]
  English
• 岩盤せん断試験の粘着力とせん断抵抗角のブロックの挙動を考慮した分析　　　　　　　　　　　　　　　
  富樫陽太; 谷和夫
  Jan. 2011, [International conference]
  English
• Relationships between strength properties obtained by rock shear tests and those by block shear tests　　　　　　　　　　　　　　　
  Togashi, Y; Tani, K
  ISRM Int. Sym. 2010 & 6th Asian Rock Mech. Sym., Oct. 2010, [International conference]
  English, Oral presentation
• 原位置岩盤試験DBに基づく岩盤せん断試験から得られる粘着力とせん断抵抗角の分析　　　　　　　　　　　　　　　
  富樫陽太; 谷和夫
  Jan. 2010, [International conference]
  English

• 2020 - Present
  環境社会デザイン実験
• 2019 - Present
  微分方程式
• 2019 - Present
  数学演習
• 2018 - Present
  建設工学演習（地盤工学担当）
• 2018
  情報基礎

• JAPAN SOCIETY OF CIVIL ENGINEERS
• THE JAPANESE GEOTECHNICAL SOCIETY

• Development of techniques for identifying deformation anisotropy in unsaturated sedimentary rocks, extension to strength anisotropy identification and modeling　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 01 Apr. 2024 - 31 Mar. 2028
  Saitama University
  Grant amount(Total)：18460000, Direct funding：14200000, Indirect funding：4260000
  Grant number：24K00976
• トンネルの切羽安定問題におけるアーチ作用の予測法の開発　　　　　　　　　　　　　　　
  Apr. 2024 - Mar. 2025
  Principal investigator
• Development of face stability theory considering progressive failure due to tunnel excavation　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Early-Career Scientists, 01 Apr. 2021 - 31 Mar. 2024
  Saitama University
  Grant amount(Total)：4680000, Direct funding：3600000, Indirect funding：1080000
  Grant number：21K14238
• 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), Grant-in-Aid for Scientific Research (B), 01 Apr. 2020 - 31 Mar. 2024
  Saitama University
  Grant amount(Total)：18070000, Direct funding：13900000, Indirect funding：4170000
  Grant number：20H02238
• 大断面函体推進における摩擦低減材の性能強化　　　　　　　　　　　　　　　
  Oct. 2022 - Mar. 2024
  Principal investigator
  Grant number：22704167
• ねじりを利用した岩石角柱供試体の単純せん断試験方法の開発　　　　　　　　　　　　　　　
  Oct. 2022 - Sep. 2023
  Principal investigator
  Grant number：22683015
• 降雨に伴う大規模斜面崩壊の予測に資する堆積岩の不飽和強度特性の検討　　　　　　　　　　　　　　　
  Mar. 2021 - Mar. 2022
  Principal investigator
• 函体推進工法による線路下アンダーパストンネル建設 における摩擦低減材の開発　　　　　　　　　　　　　　　
  Nov. 2020 - Mar. 2022
  Principal investigator
• 飽和度の変化に伴う堆積岩の変形異方性と放射性廃棄物の合理的な埋設方法に関する研究　　　　　　　　　　　　　　　
  Oct. 2018 - Mar. 2021
  Principal investigator
  Competitive research funding
• 三軸試験による堆積軟岩の異方剛性およびその卓越方向の特定　　　　　　　　　　　　　　　
  Aug. 2018 - Mar. 2020
  Principal investigator
  Competitive research funding
• Sep. 2013 - Sep. 2013
  Principal investigator
  Competitive research funding

• 地下構造物の施工法に使用する摩擦低減材の材料試験装置と材料試験方法　　　　　　　　　　　　　　　
  Patent right
• 地下構造物の施工法及びそれに使用する摩擦低減材　　　　　　　　　　　　　　　
  Patent right
• 岩石の直交異方弾性の特定方法　　　　　　　　　　　　　　　
  Patent right
• 掘削工法模擬装置　　　　　　　　　　　　　　　
  Patent right
  Patent/Registration no：特許6498624
• 新設・既設地下構造物の接続構造　　　　　　　　　　　　　　　
  Patent right
  Patent/Registration no：特許6474653
• 風速計測装置及び変状評価装置　　　　　　　　　　　　　　　
  Patent right
• トンネル内の列車風を利用した風力発電方法　　　　　　　　　　　　　　　
  Patent right
  Patent/Registration no：特許6437350
• 覆工エレメント　　　　　　　　　　　　　　　
  Patent right
• トンネル内の列車風を利用したトンネル覆工の変形計測方法　　　　　　　　　　　　　　　
  Patent right
  Patent/Registration no：特許6293691
• 風速計測を用いたトンネル樋の目詰まり計測方法　　　　　　　　　　　　　　　
  Patent right
  Patent/Registration no：特許6284892
• 三軸試験装置及び三軸試験方法　　　　　　　　　　　　　　　
  Patent right
  Patent/Registration no：特許6222659
• 原位置岩盤試験方法および装置　　　　　　　　　　　　　　　
  Patent right
  Patent/Registration no：特許6112663
• トンネル掘削機　　　　　　　　　　　　　　　
  Patent right