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TACHIBANA Shinya
Research Center for Urban Safety and Security
Professor

Researcher basic information

■ Research Keyword
  • Geoenvironmental Engineering
  • Geotechnical Engineering
  • Geological disposal
  • 不飽和土
■ Research Areas
  • Social infrastructure (civil Engineering, architecture, disaster prevention) / Geotechnical engineering

Research activity information

■ Award
  • Jun. 2020 Institution of Civil Engineers (ICE), ICE Publishing Awards 2020, Telford Premium, Extension of unsaturated soil mechanics and its applications; Geotechnical Research, E-ISSN 2052-6156, Volume 6 Issue 3, September 2019, pp. 156-176
    Atsushi Iizuka, Shinya Tachibana, Tomohide Takeyama, Shun Nomura, Yuri Sugiyama, Hideki Ohta

  • Nov. 2013 公益社団法人地盤工学会, 第48回地盤工学研究発表会 優秀論文発表者賞, 真空圧密による粘土地盤の不飽和化
    橘伸也

■ Paper
  • Shinji Ito, Shinya Tachibana, Tomohide Takeyama, Atsushi Iizuka
    Corresponding, Elsevier BV, May 2022, Soils and Foundations, 62(4) (4), 101161 - 101161, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Shinya Tachibana, Daisuke Hayashi, Tomoko Ishii, Tomohide Takeyama, Atsushi Iizuka
    Lead, Apr. 2022, International Journal of GEOMATE, 22(92) (92), 1 - 8, English
    [Refereed]
    Scientific journal

  • Numerical simulation of water migration in the unsaturated bentonite due to temperature gradient
    有井拓也, 太田有祐, 橘伸也, 竹山智英, 飯塚敦
    Nov. 2021, Proceedings of Kansai Geo-Symposium, 9, 218 - 222, Japanese
    [Refereed]
    Symposium

  • Kazuya Honda, Tomohide Takeyama, Shinya Tachibana, Atsushi Iizuka
    The risk assessment of liquefaction damage is crucial for recovery from large-scale earthquakes, which are predicted to occur in recent years. In this study, the liquefaction risk is evaluated over a wide area through effective stress analysis, considering the interaction between the soil particles and pore water. The target area of the analysis was the 23 wards of Tokyo, including the zero-meter zone, and a 3D ground model was constructed from the borehole data. A vertical columnar ground model is established at 463 locations from the 3D ground model using the material parameter determination flow. The liquefaction risk of a wide area is evaluated by performing seismic response analysis using two types of earthquake motions for each analysis point, thus showing the difference in the risk and degree of liquefaction by location. In the future, various dynamic analyses must be conducted with sufficient resolution and compared with the actual damages.
    GEOMATE INT SOC, Oct. 2021, INTERNATIONAL JOURNAL OF GEOMATE, 21(86) (86), 48 - 54, English
    Scientific journal

  • Tomohide Takeyama, Kazuya Honda, Shinya Tachibana, Atsushi Iizuka
    Recently, the occurrence of large earthquakes has become a concern in Japan, prompting the need for a numerical method that can accurately predict real phenomena, such as the elastoplastic soil-water coupled finite element method. Because the elastoplastic constitutive model requires many material parameters, various soil tests and specialized knowledge are needed to determine these material parameters. In this study, a new method was proposed to determine the material parameters from the limited ground information obtained by borehole inspections and the method was validated by comparing the numerical results with monitored seismic behavior. One-dimensional seismic analyses were conducted using the material parameters estimated from borehole data near the target sites. It was confirmed that the amplitude and predominant period obtained by numerical simulation were consistent with the monitored data. As a result, it was found that the dynamic numerical result was more consistent with the monitored data when the compression index was set to be larger than that in the static analysis.
    International Journal of Geomate, Sep. 2021, International Journal of GEOMATE, 21(85) (85), 1 - 9, English
    [Refereed]
    Scientific journal

  • Study of slow slip mechanism on plate boundary fault decollement zone
    Yuri Sugiyama, Shinya Tachibana, Yoshiyuki Morikawa
    Jun. 2021, Report of the port and airport research institute, 60(1) (1), 3 - 29, Japanese
    [Refereed]
    Research institution

  • Shinya Tachibana, Masayoshi Matsumoto, Atsushi Iizuka
    Lead, Elsevier BV, Sep. 2020, Soils and Foundations, 60(5) (5), 1287 - 1298
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Rasool, A.M, Tachibana, S, Ahmad, H.M, Tahir, M.F
    International Journal of Geomate, May 2020, International Journal of GEOMATE, 18(69) (69)
    [Refereed]
    Scientific journal

  • Ali Murtaza Rasool, Jiro Kuwano, Shinya Tachibana
    Springer Science and Business Media LLC, Apr. 2020, Geotechnical and Geological Engineering, 38(2) (2), 1707 - 1719
    [Refereed]
    Scientific journal

  • ベントナイトの膨潤圧試験における壁面摩擦の影響に関する数値解析的検討
    小山円香, 伊藤真司, 橘伸也, 飯塚敦
    Mar. 2020, 神戸大学都市安全研究センター研究報告, 24, 66 - 76
    Research institution
    Link to Kobe Univ. Repository (Kernel)

  • 層間水の脱水による土粒子密度変化を考慮した連続条件式
    前川慎太郎, 岩木友哉, 飯塚敦, 橘伸也
    Mar. 2020, 神戸大学都市安全研究センター研究報告, 24, 34 - 43
    Research institution
    Link to Kobe Univ. Repository (Kernel)

  • ベイズ推定を用いた被害規模予測モデルの改善
    小林宗一郎, 本田和也, 橘伸也, 飯塚敦
    Mar. 2020, 神戸大学都市安全研究センター研究報告, 24, 25 - 33
    Research institution
    Link to Kobe Univ. Repository (Kernel)

  • せん断強度に基づく飽和度変化に起因する硬化特性の定量的評価
    有井拓也, 林啓太, 橘伸也, 飯塚敦
    Mar. 2020, 神戸大学都市安全研究センター研究報告, 24, 18 - 24
    Research institution
    Link to Kobe Univ. Repository (Kernel)

  • Shinya Tachibana, Shinji Ito, Atsushi Iizuka
    Lead, Elsevier BV, Feb. 2020, Soils and Foundations, 60(1) (1), 179 - 197
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Atsushi Iizuka, Shinya Tachibana, Tomohide Takeyama, Yuri Sugiyama, Shun Nomura, Hideki Ohta
    Thomas Telford Ltd., Sep. 2019, Geotechnical Research, 6(3) (3), 156 - 176, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Iqbal, M.R, Hashimoto, K, TACHIBANA SHINYA, Kawamoto, K
    GEOMATE International Society, May 2019, International Journal of GEOMATE, 16(57) (57), 116 - 123, English
    [Refereed]
    Scientific journal

  • Y Sugiyama, S Tachibana, H Sakaguchi, A Iizuka
    Oxford University Press (OUP), Mar. 2019, Geophysical Journal International, 216(3) (3), 1890 - 1900, English
    [Refereed]
    Scientific journal

  • 不飽和土の締固め曲線と硬化則の関連性について
    松本 昌祥, TACHIBANA SHINYA, IIZUKA ATSUSHI
    Mar. 2019, 都市安全研究センター研究報告, (23) (23), 37 - 54, Japanese
    Research institution
    Link to Kobe Univ. Repository (Kernel)

  • 深海底プレート境界デコルマ帯を想定した過圧密化の発現
    上原 拓真, IIZUKA ATSUSHI, TACHIBANA SHINYA, 杉山 友理
    Mar. 2019, 都市安全研究センター研究報告, (23) (23), 26 - 36, Japanese
    Research institution
    Link to Kobe Univ. Repository (Kernel)

  • MALIK ADNAN ANWAR, KUWANO JIRO, TACHIBANA SHINYA, MAEJIMA TADASHI
    Springer Berlin Heidelberg, Feb. 2019, Acta Geotchnica, English
    [Refereed]
    Scientific journal

  • TAKEYAMA TOMOHIDE, TACHIBANA SHINYA, KITANOI TOMOKI, IIZUKA ATSUSHI
    Feb. 2019, Journal of Engineering and Construction, 8(1) (1), 13 - 18, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • 本田 和也, TACHIBANA SHINYA, IIZUKA ATSUSHI
    土木学会, 2019, 土木学会論文集（F部門）, 75(1) (1), 31 - 39, Japanese
    [Refereed]
    Scientific journal

  • Nomura, Shun, Kawai, Katsuyuki, Tachibana, Shinya, Iizuka, Atsushi
    The migration of contaminant through soil is usually modeled using the advection-dispersion equation and assumes that the porous media is stationary without introducing a constitutive equation to represent soil structure. Consequently, time-dependent deformation induced by soil consolidation or physical remediation is not considered, despite the need to consider these variables during planning for the remediation of contaminated ground, the prediction of contaminated groundwater movement, and the design of engineered landfills. This study focuses on the numerical modeling of solute transfer during consolidation as a first step to resolve some of these issues. We combine a coupling theory-based mass conservation law for soil-fluid-solute phases with finite element modeling to simulate solute transfer during deformation and groundwater convection. We also assessed the sensitivity of solute transfer to the initial boundary conditions. The modeling shows the migration of solute toward the ground surface as a result of ground settlement and the dissipation of excess pore water pressure. The form of solute transport is dependent on the ground conditions, including factors such as the loading schedule, contamination depth, and water content. The results indicate that an understanding of the interaction between coupling phases is essential in predicting solute transfer in ground deformation and could provide an appropriate approach to ground management for soil remediation.
    WILEY, Jul. 2018, INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, 42(10) (10), 1172 - 1196, English
    [Refereed]
    Scientific journal

  • Confining tie rods in confined-reinforced earth method to reduce differential settlement
    Hung, H.M, Kuwano, J, Tachibana, S
    2018, Proceedings of the 11th International Conference on Geosynthetics (11ICG)
    International conference proceedings

  • Bhuddarak Charatpangoon, Aiko Furukawa, Junji Kiyono, Shinya Tachibana, Tomohide Takeyama, Atsushi Iizuka
    Currently, finite element codes for small-strain have been widely applied in geotechnical engineering problems. However, the limitations of these codes are recognized, especially when the strain is large. To overthrow such limitations, finite-strain finite element code for porous media is needed. Therefore, this study aims to implement the finite element code for coupled solid-fluid at finite strain for static and dynamic problems. Firstly, the governing equation for porous media at finite-strain was introduced. Then, the mixed formulation of both phases with respect to the reference coordinates by deriving the governing equations with respect to the reference or current coordinates and by considering the solid and fluid as separate, was given. At present, the code is developed only for elastic regime as its preliminary step. In this study, the proposed code has been verified with the static and dynamic problem. And, the result of the finite-strain finite element code is then compared with the result of the analytical solution and small-strain finite element code within the small-strain regime. Thereafter, the proposed code was used to estimate the response of the earthen dam when subjected to a dynamic load. Finally, the results, discussion, and comparison between small- and finite-strain finite element analyses were presented.
    GEOMATE International Society, 2018, International Journal of GEOMATE, 15(51) (51), 1 - 8, English
    [Refereed]
    Scientific journal

  • Sugiyama Yuri, Tachibana Shinya, Sakaguchi Hide, Iizuka Atsushi
    In view of the need to utilize ocean space and to develop seabed resources, the assessment of the stability of deep seabed soil has emerged as an important challenge in the field of geomechanics. To study seabed stability, the strength and stiffness of the natural ground must be ascertained. Accordingly, it is necessary either to conduct laboratory testing on soil specimens sampled from the seabed or to estimate the strength and stiffness by in-situ tests. While in the future it may be reasonable to conduct in-situ tests to estimate the stiffness and strength of seabed soil, it will still be necessary to compare the physical properties measured by in-situ testing with those measured by laboratory testing in advance of these determinations. In short, soil specimens must be sampled from the actual deep seabed, and laboratory mechanical tests must be conducted on the sampled soil specimens. However, soil sampled from the ocean bottom is subject to effects that differ from those exerted on soil sampled from the earth. More specifically, the non-negligible effects of disturbance are expected with soil sampled from the ocean bottom. The effects of disturbance occur during the sampling process due to the vaporization of dissolved gases, as these soil specimens are under relatively higher pressure and contain pore water with a high amount of dissolved gases. Therefore, numerical simulations were conducted in the present study to investigate the effects of vaporized dissolved gases on the mechanical behavior of soil specimens during sampling and on the undrained shear strength as determined by laboratory tests. The analyses revealed that the combination of the decreasing effective stress caused by the sampling and factors such as overconsolidation and unsaturation is attributable to the difference between the soil strength ascertained by laboratory testing and the in-situ soil strength.
    Japanese Geotechnical Society, 2018, Soils and Foundations, Vol.58(No.3) (No.3), pp.689 - 701, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • TC106 General Report; Unsaturated Soils
    Iizuka,A, Tachibana,S
    Sep. 2017, Proc. 19th International Conference on Soil Mechanics and Geotechnical Engineering, pp.1113 - 1120, English
    [Refereed]
    International conference proceedings

  • H-M-C coupling analysis considering several scenarios of long-term alteration in cement-bentonite system
    Tachibana, S, Ito, S, Iizuka, A, Owada, H, Hayashi, D
    May 2017, Proc. of 2nd Annual Workshop of the Cebama Project, English
    [Refereed]
    International conference proceedings

  • Adnan Anwar Malik, Jiro Kuwano, Shinya Tachibana, Tadashi Maejima
    In the present study, the end bearing capacity of screw and straight pipe pile under similar pile tip area and ground conditions were investigated. The effect of increasing overburden pressure was also considered in this research. Pile load tests on close-ended screw and straight pipe piles were conducted in the small scale. Dry Toyoura sand was used to develop the model ground. The sand was compacted at relative density of 70, 80 and 92 %. It was observed that in case of straight pipe pile, load settlement curve plunges downward without increase in load around settlement equals to 10 % of pile tip diameter, whereas in case of screw pile, the load settlement curve plunges around settlement equals to 15 % of pile tip diameter. Moreover, the screw piles having helix-to-shaft diameter ratio 2-4.1 showed 2-12 times higher end bearing capacity than straight pipe piles with similar pile shaft diameter. It was also observed from the test results that the end bearing capacity of single-helix screw pile was in average 16.25 % less than straight pipe pile with similar pile tip area and ground conditions irrespective of the effect of increasing overburden pressure.
    SPRINGER HEIDELBERG, Apr. 2017, ACTA GEOTECHNICA, 12(2) (2), 415 - 428, English
    [Refereed]
    Scientific journal

  • 海底地盤におけるサンプリング時の応力解放に伴う乱れに関する検討
    岡田 真理子, 杉山 友理, TACHIBANA SHINYA, IIZUKA ATSUSHI
    Mar. 2017, 都市安全研究センター研究報告, (21) (21), 36 - 48, Japanese
    Research institution
    Link to Kobe Univ. Repository (Kernel)

  • 化学変質を考慮したベントナイト緩衝材の長期挙動評価
    神藤 卓哉, IIZUKA ATSUSHI, TACHIBANA SHINYA
    Mar. 2017, 都市安全研究センター研究報告, (21) (21), 83 - 90, Japanese
    Research institution
    Link to Kobe Univ. Repository (Kernel)

  • ジオテキスタイル補強土の補強効果の評価手法
    織田 裕至, IIZUKA ATSUSHI, TACHIBANA SHINYA
    Mar. 2017, 都市安全研究センター研究報告, (21) (21), 63 - 72, Japanese
    Research institution
    Link to Kobe Univ. Repository (Kernel)

  • Yusuke Takayama, Shinya Tachibana, Atsushi Iizuka, Katsuyuki Kawai, Ichizo Kobayashi
    Bentonite has remarkable swelling characteristics and low permeability that enhance the stability of the buffer materials in repositories for the geological disposal of radioactive waste. It is necessary to apply reliable numerical simulation techniques to assess the safety and mechanical stability of repositories over a long period of time. Having a constitutive model that can describe the mechanical behavior of bentonite is key to such numerical simulations. This paper proposes an elasto-plastic constitutive model to describe the changes in the mechanical properties of bentonite due to saturation in the progress of a repository becoming submerged under groundwater. In the proposed model, the swelling index is formulated as a function of the degree-of-saturation to express not only the swelling behavior, but also the dependency of the degree-of-saturation on the dilatancy characteristics. The montmorillonite content is used as a material parameter to determine the normal consolidation line. The experimental results of swelling volume and swelling pressure tests in previous literature are shown to have been satisfactorily predicted by the proposed model. (C) 2017 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
    JAPANESE GEOTECHNICAL SOC, Feb. 2017, SOILS AND FOUNDATIONS, 57(1) (1), 80 - 91, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Ho Manh Hung, Jiro Kuwano, Shinya Tachibana
    A new method, the confined-reinforced earth (CRE) method, has been suggested to strengthen the subgrade layer, at the bottom of road pavement. The method uses granular soil, geogrids and confining tie rods. It is intended to reduce the damage from the large differential settlement between bridges or culverts and their approaches due to major earthquakes, and to make it possible for vehicles, especially emergency vehicles to pass the resulting unevenness. This study presents model tests designed to investigate the effects of the length of confined-reinforced earth by examining how lateral boundary conditions affect the consequences of differential settlement. Tests with two lateral boundary conditions, i.e. fixed-fixed (both ends of the geogrids are laterally fixed) and fixed-free (one end of the geogrid is laterally fixed and the other end is free) of the CRE method were performed and the effect of differential settlement was compared. The results show that the lateral boundary condition significantly affects the CRE behavior and the deformation in the fixed-fixed boundary condition is smaller than that in the fixed-free boundary condition.
    GEOMATE International Society, 2017, International Journal of GEOMATE, 13(38) (38), 149 - 156, English
    [Refereed]
    Scientific journal

  • Role of prestress in geogrid of confined-reinforced earth method to mitigate bridge approach settlement
    Hung, H.M, Kuwano, J, TACHIBANA SHINYA
    Nov. 2016, Proc. of 6th Asian regional conference on geosynthetics – geosynthetics for infrastructure development, 916 - 924, English
    [Refereed]
    International conference proceedings

  • Influence of soil density on the behavior of geogrid-reinforced sand ground
    Soe, A.A, Kuwano, J, Akram, I, TACHIBANA SHINYA
    Nov. 2016, Proc. of 6th Asian regional conference on geosynthetics – geosynthetics for infrastructure development, 455 - 464, English
    [Refereed]
    International conference proceedings

  • Interpretation of screw pile test data using extrapolation method in dense sand
    MALIK ADNAN ANWAR, KUWANO JIRO, TACHIBANA SHINYA, MAEJIMA TADASHI
    Mar. 2016, International Journal of GEOMATE, 10(1) (1), 1567 - 1574, English
    [Refereed]
    Scientific journal

  • AUNG AUNG SOE, Jiro KUWANO, Shinya TACHIBANA, Ilyas AKRAM
    Japan Chapter of International Geosynthetics Society, 2016, Geosynthetics Engineering Journal, 31, 45 - 45, English
    Scientific journal

  • Performance of confined-reinforced earth under different lateral boundary condition
    Hung, H.M, Kuwano, J, Tachibana, S, Ng’anzi, U
    国際ジオシンセティックス学会日本支部, 2016, ジオシンセティックス論文集, 31, 249 - 254, English
    [Refereed]
    Symposium

  • Optimization of landfill industrial wastes in Japan by mixing various waste samples, effects on their dry bulk densities and consolidation
    Iqbal, M.R, Oohata, H, Siato, T, Tachibana, S, Kawamoto, K
    2015, Proc. of ACEPS2015, 32 - 39
    International conference proceedings

  • Geotechnical and hydraulic performance of liners constructed using locally available soils
    Rashid, H.M.A, Wanigarathna, D, Kurukulasuriya, L.C, Priyankara, N.H, Saito, T, Tachibana, S, Kawamoto
    2015, Proc. of International conference on geotechnical engineering ICGE-Colombo-2015, 257 - 260
    International conference proceedings

  • Geotechnical properties for municipal solid waste at open dumping sites located in wet and dry zones
    Ohata, H, Saito, S, Tachibana, S, Balasooriya, B.L.C.B, Priyankara, N.H, Alagiyawanna, A.M.N, Kurukulasuriya, L.C, Kawamoto, K
    2015, Proc. of International conference on geotechnical engineering ICGE-Colombo-2015, 269 - 272
    International conference proceedings

  • Experimental study of mechanical behavior of silty clay in different loading sequences under constant water content condition
    Rasool, A.M, Kuwano, J, Tachibana, S
    2015, Proc. of 6th Asia Pacific Conference on Unsaturated Soils, 267 - 274
    International conference proceedings

  • Ali Murtaza Rasool, Jiro Kuwano, Shinya Tachibana
    Unsaturated soils are most common in geotechnical practice. In order to study mechanical behavior of unsaturated soil a series of constant water content tests were performed in this study. Soil specimens were tested under isotropic loading-unloading, monotonic and cyclic loading sequences to study the effects of stress history on change in void ratio and suction, and on shear characteristics of unsaturated soil. It was concluded that the mechanical behavior of silty soil named as DL clay is not affected significantly by loading sequences incorporated.
    IOS PRESS, 2015, DEFORMATION CHARACTERISTICS OF GEOMATERIALS, 6, 267 - 274, English
    [Refereed]
    International conference proceedings

  • Shin-ichi KANAZAWA, Shinya TACHIBANA, Atsushi IIZUKA
    Japan Society of Civil Engineers, 2015, Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)), 71(2) (2), I_429 - I_436, Japanese
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • AUNG AUNG SOE, TACHIBANA SHINYA, KUWANO JIRO
    Load settlement behavior, bearing capacity improvement and surface deformation characteristics of geogrid reinforced soil were investigated through experimental study. Rigid circular steel plate was used as a model footing. In model experiments, it included one unreinforced test and four reinforced tests; one with triangular geogrid and three with biaxial geogrids. Test results show that triangular geogrid reinforcement outperforms biaxial geogrids of almost same unit weight. For biaxial geogrids, larger bearing capacity improvement was noticed with geogrid of higher tensile strength. Uniform surface deformation was observed with no reinforcement and triangular geogrid reinforcement, while higher non uniformity was observed with stiffer biaxial geogrid reinforcements.
    Japan Chapter of International Geosynthetics Society, 2015, ジオシンセティックス論文集, 30, 37 - 42, English
    [Refereed]
    Scientific journal

  • HO MANH HUNG, TACHIBANA SHINYA, KUWANO JIRO
    Large earthquakes often lead to large differential settlement between bridges and their approaches. In some of these cases, emergency vehicles cannot pass the unevenness after earthquakes. In order to mitigate this problem, confinedreinforced earth (CRE) method was introduced in subgrade layer, at the bottom of pavement layer of road structures. Some laboratory prototype scale model test with various prestress in geogrid layers were carried out to investigate the effects of prestress on deformation of confined-reinforced layer due to differential settlement. The levels of prestress is applied via prestrain set as 0%, 0.016%, 0.05% and 0.1% in elongation. The results show that the prestress in geogrid plays an important role in reduction of differential settlement between bridges and their approaches.
    Japan Chapter of International Geosynthetics Society, 2015, ジオシンセティックス論文集, 30, 31 - 36, English
    [Refereed]
    Scientific journal

  • A finite element method to describe the cyclic behavior of saturated soil
    TAKEYAMA TOMOHIDE, TACHIBANA SHINYA, FURUKAWA AIKO
    2015, International Journal of Material Science and Engineering, 2(1) (1), 20 - 25, English
    [Refereed]
    Scientific journal

  • Estimation of reinforcement mechanism according to the subgrade arrangement
    S. Tachibana, J. Kuwano, N. Tatta, T. Ishigaki
    A confined-reinforced earth method for a subgrade is one of the proposed methods to mitigate unevenness of road surface. It is expected to ensure emergency vehicles going through the road even just after an earthquake. A reinforced subgrade consists of granular materials, geogrids and steel confining rods. Construction of this layer beneath the asphalt pavement is expected to prevent unevenness even if the road embankments settle due to earthquake. A series of laboratory model tests was performed to investigate the reinforcement mechanism by changing a thickness of the composite layer and introducing pre-stress into confining steel rods. In the model tests, to simulate the settlement, one end of the model of a composite layer in a soil tank was raised by a crane and the other end was fixed at the bottom of the container. It was found that a thickness had a strong influence on the transmission of force in a composite layer and that sufficient thickness of the composite layer was needed to distribute the weight to geogrid layers in a reinforced subgrade efficiently. Stretched geogrids were thought to play an important role in confining the dilation of granular soil layer and reducing the shear deformation of soil layer.
    2014, １３） Tachibana, S., Kuwano, J., Tatta, S. and Ishigaki, T.
    International conference proceedings

  • Yuri Sugiyama, Shun Nomura, Atsushi Iizuka, Katsuyuki Kawai, Shinya Tachibana, Shin Ichi Kanazawa, Tomohide Takeyama
    The East Japan Earthquake and Tsunami caused serious damages in the coastal area of eastern Japan. Many houses and cars on the road were swept away by the tsunami. Also, industrial facilities such as chemical plants in the coastal area were completely destroyed. Damage from saline seawater was not limited only to the rice field areas, and there were also serious anxieties regarding the possibility of ground contamination as a result of harmful heavy metals that leaked from destroyed chemical plants. In light of this scenario, we carried out a quantitative survey to examine these areas. This paper reports on the results of our survey. It was found that high salt concentrations were detected on the ground surface but predictions state that these concentrations can be diluted with rainfall. It was also revealed that serious ground contamination due to the harmful heavy metals was not detected.
    2014, Theoretical and Applied Mechanics Japan, 62, 141 - 148, English
    [Refereed]
    Scientific journal

  • Implicit stress-update algorithm for the constitutive model to describe cyclic behavior based on finite deformation theory
    Takeyama, T, Tachibana, S
    2013, Proc. of 10th International Conference on Urban Earthquake Engineering, 423 - 428
    International conference proceedings

  • Effects of layer thickness on its stiffness in the confined-reinforced earth method
    Tachibana, S, Kuwano, J, Ishigaki, T, Tatta, N
    2013, Proc. of 3rd International Symposium on Engineering, Energy and Environment (ISEEE3), 485 - 490
    International conference proceedings

  • Confined-reinforced subgrade to reduce differential settlement of road pavement
    Kuwano, J, Tachibana, S, Ishigaki, T, Tatta, N
    2013, Proc. of 5th KGS-JGS Geotechnical Engineering Workshop, 149 - 154
    International conference proceedings

  • TACHIBANA Shinya, KUWANO Jiro, ISHIGAKI Tsutomu, TATTA Naoki
    In the confined-reinforced earth method, a composite layer which has a high stiffness is constructed in the subgrade to support the pavement. This layer consists of granular materials, geogrids and confining members. Compacted granular materials are reinforced between some geogrids and are further confined by some members. Construction of this layer beneath the asphalt pavement is expected to prevent unevenness even if the road embankments settle due to earthquake. In this study, a series of model tests was performed for the purpose of investigating the reinforcement effects against different designs such as a layer thickness and an introduction of pre-stress in the confining members.
    Japan Chapter of International Geosynthetics Society, 2013, Proceedings of geosynthetics symposium, 28, 59 - 66, Japanese
    [Refereed]
    Symposium

  • Shinya Tachibana, Jiro Kuwano
    To predict the mechanical behavior of granular materials, the importance of the noncoaxiality that is, the noncoincidence of the principal directions of inelastic stretching and those of stress, has been recognized in the geotechnical field. In this study, the deformation characteristics during shearing under the effective mean stress constant and the intermediate principal stress coefficient constant conditions are examined by the elasto-plastic constitutive model in comparison with experimental results on Toyoura sand. In constitutive modeling, the anisotropy in the loading surface and the effect of stress rate tangent to loading surface, both of which cause noncoaxiality, are taken into consideration.
    Springer Netherlands, 2013, Geotechnical, Geological and Earthquake Engineering, 25, 181 - 198, English
    [Refereed]
    In book

  • Rama Mohan Pokhrel, Jiro Kuwano, Shinya Tachibana
    Soil liquefaction is a devastating geotechnical phenomenon associated with earthquakes that causes failure of foundations, soil embankments and dams, especially in cities built on young alluvial deposits. Therefore, the ability to predict liquefaction potential is important and valuable for seismic hazard assessment The conventional approach to evaluating liquefaction potential at any given point is through the use of borehole data. The liquefaction potentials within sedimentary basins vary over short distances with local soil properties. The purpose of this paper is to evaluate liquefaction potentials at unsampled locations where borehole data are not available based on the measured liquefaction potentials at selected borehole locations. The application and the importance of the geostatistical analytical technique (kriging method) for the estimation of liquefaction potential at unsampled locations are shown. The data set consists of liquefaction potential values measured at 86 randomly distributed boreholes in Saitama City, Japan. With the use of calculated liquefaction potentials at sampled locations, the experimental semivariograms were constructed. The experimental variogram characterizes the spatial variability of the calculated liquefaction potential. To interpolate the liquefaction potential over the entire area, the ordinary kriging spherical model was applied. In applying the kriging method, both isotropic and anisotropic models were used; however, the anisotropic model exhibited a better fit for interpolating sedimentary deposits. The interpolated liquefaction potentials are validated with the measured liquefaction potentials of an independently collected second set of 41 boreholes. The interpolated liquefaction potentials show strong concurrence with the measured values. (C) 2012 Elsevier B.V. All rights reserved.
    ELSEVIER SCIENCE BV, Jan. 2013, ENGINEERING GEOLOGY, 152(1) (1), 26 - 37, English
    [Refereed]
    Scientific journal

  • Shintaro Ohno, Katsuyuki Kawai, Atsushi Iizuka, Shinya Tachibana, Shin ichi Kanazawa, Hideki Ohta
    © Springer Science+Business Media Dordrecht 2013. An elasto-plastic constitutive model for unsaturated soils is improved to realize numerical stability of computations at the singular point on the yield surface and an accurate prediction of the mechanical behavior of overconsolidated (or elastic state) soils in this chapter. The authors introduce the exponential contractancy model (EC model) by Ohno et al. (J Appl Mech JSCE 9:407–414, 2006) and the subloading surface model by Hashiguchi and Chen (Int J Numer Anal Method Geomech 22:197–227, 1998) to the elasto-plastic constitutive model for unsaturated soils by Ohno et al. (J JSCE 63(4):1132–1141, 2007). The applicability of the constitutive model is verified by simulating triaxial shear tests under constant net stress undrained conditions.
    2013, Geotechnical, Geological and Earthquake Engineering, 25, 215 - 228
    [Refereed]
    In book

  • The role of unsaturated geomechanics in desertification due to salt damage
    Iizuka, A, Kawai, K, Nomura, S, Tachibana, S, Ohno, S, Pipatopongsa, T
    Desertification poses a serious problem to the global environment. A reported 7.2% of the world's land area is affected by desertification, with 35.8% of this figure located in Asia. Major causes of desertification include excessive deforestation, overgrazing of cattle and damage due to salt, all of which are the results of water cycle disorders relating to the geosphere and atmosphere. Through hierarchization (structurization) analysis, this paper discusses the issue of desertification as it pertains to issues threatening the health of the global environment. The key issues to be taken into consideration with regard to desertification have been extracted and examined from a geotechnical viewpoint. The authors focus on the role that geotechnical engineering can play in the prevention of desertification and in its restoration process. The paper highlights a northeastern area of Thailand where salt damage is likely to result in desertification. In order to numerically simulate what is happening there, a set of mathematical models based on unsaturated geomechanics is formulated, taking into account key issues revealed through a hierarchization analysis. The paper also includes a discussion on the applicability of these models for addressing the salt damage problem affecting this northeastern part of Thailand. The importance of unsaturated geomechanics is demonstrated in this paper, particularly as it pertains to prevention and restoration of salt-damaged areas that finally lead to desertification. © 2012 IEEE.
    Mar. 2012, Proc. 5th Asia-Pacific Conference on Unsaturated Soils (AP-UNSAT2011), pp.31-44, 30 - 43, English
    [Refereed]
    International conference proceedings

  • Soil liquefaction vulnerability mapping due to seismic activity using geo-statics, GIS and geotechnical data
    Bhuyan, M.H, Kuwano, J, Tachibana, S, Yamaoka, S
    2012, Proc. of 2nd International Conference on Transportation Geotechnics, 891 - 896
    International conference proceedings

  • GIS-based soil liquefaction hazard zpnation due to earthquake using geotechnical data
    Bhuyan, M.H, Pokhrel, R.M, Kuwano, J, Tachibana, S
    The GEOMATE International Society, 2012, International Journal of GEOMATE, 2(1) (1), 154 - 160, Japanese
    [Refereed]
    Scientific journal

  • Geostatistical analysis for spatial evaluation of liquefaction potential in Saitama City
    Pokhrel, R.M, Kuwano, J, Tachibana, S
    Saga University, 2012, Lowland Technology International, 14(1) (1), 45 - 51, English
    [Refereed]
    Scientific journal

  • Elasto-plastic constitutive model for expansive soils with a concept of fully saturation curve
    S. Tachibana, Y. Takayama, A. Iizuka, K. Kawai, S. Ohno, I. Kobayashi
    This study presents a new constitutive model for expansive soils. Under any arbitrary state of degree-of-saturation, the mechanical void ratio predicted by the elasto-plastic constitutive models, i.e. EC model and Se-hardening model are combined with the additional void ratio in order to characterize the typical swelling behavior of expansive soil. Herein, the fully saturation curve which derived from compaction and consolidation experimental tests are taken into consideration. The proposed model is examined by simulating the typical experimental test on expansive soil, i.e. normally consolidation and swelling pressure tests. © 2012 IEEE.
    2012, 5th Asia-Pacific Conference on Unsaturated Soils 2012, 1, 303 - 308, English
    [Refereed]
    International conference proceedings

  • Mathematical model of soil/water/air coupled problem for unsaturated soils considering mass transfer within pore-water
    Nomura, S, Kawai, K, Iizuka, A, Tachibana, S, Kanazawa, S
    Soil contamination caused by industrial activity has become a serious environmental problem causing ground deterioration. Since soil decontamination is expensive and its efficiency is difficult to estimate, the contaminated ground areas are often abandoned without purification. To encourage the reuse of land, the methods for predicting contaminant transfer, induced by changes in external forces and water levels are required. In this study, the mass transport equation was applied to the existing unsaturated soil/water/air coupled F. E. analysis code for expressing the advection and dispersion behavior of dissolved material within pore-water. First, the continuity condition equations and advection-dispersion equations were developed from mass conservation laws of soil, water and dissolved materials. These governing equations, including the constitutive model for unsaturated soil, were formulated as initial and boundary values problems and coded as DACSAR-Mad. Assuming the ground to be polluted, the effect of external forces on the ground surface was simulated. It was found that the external forces contribute to mass transfer. This analysis code is effective in describing the complications of the mass transfer problem including the effects of external force and water level. © 2012 IEEE.
    2012, Proc. 5th Asia-Pacific Conf. on Unsaturated Soils, 1, 267 - 272
    [Refereed]
    International conference proceedings

  • Shin-ichi KANAZAWA, Takuma TOYOSHIMA, Katsuyuki KAWAI, Shinya TACHIBANA, Atsushi IIZUKA
    Japan Society of Civil Engineers, 2012, Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)), 68(2) (2), I_291 - I_298, Japanese
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • S. Nomura, K. Kawai, S. Kanazawa, A. Iizuka, S. Ohno, P. Thirapong, S. Tachibana
    Desertification due to salt damage has recently become a serious problem throughout the world. Salt damage is a phenomenon where salt in the groundwater gets concentrated at the ground surface and kills vegetation. In this study salt damage due to disequilibrium of water balance was simulated with unsaturated soil/water coupled simulation code, as applied the material transport equation. Evaporation and precipitation cycles were applied to a model of ground that contained salty groundwater in its deep region. This allowed the successful reproduction of the phenomenon of salt accumulation on the ground surface. Additionally, identical climatic conditions were applied to model grounds consisting of two types of soil, different in terms of their soil-water retention characteristics. It was found that two methods of overlay and insertion of a layer of coarse-grade material, known as 'mulching', are effective in the prevention of salt accumulation. © 2011 Taylor & Francis Group, London.
    Dec. 2011, Unsaturated Soils - Proceedings of the 5th International Conference on Unsaturated Soils, 2, 1133 - 1139
    International conference proceedings

  • M. Tanaka, K. Kawai, S. Kanazawa, A. Iizuka, S. Tachibana, S. Ohno, T. Takeyama
    It is difficult to estimate the current stress state of existing embankments because of their inherent sloping geometric shapes. Therefore an elastic analysis is always carried out in advance and the calculated stress state, assumed as the current stress, is used as an input parameter in the deformation analysis of an embankment. However, the stress state of a banking material can be quite complicated since banking materials are elasto-plastic and unsaturated in most cases, and, their behavior strongly depends on the stress history. In this study, the banking process is simulated with an elasto-plastic constitutive model for unsaturated soil. Specifically, the effects of banking speed and initial suction within the banking material are considered. It is found that the post-banking stress state depends on the distribution of the initial suction due to soil-water retention characteristics. © 2011 Taylor & Francis Group, London.
    Dec. 2011, Unsaturated Soils - Proceedings of the 5th International Conference on Unsaturated Soils, 2, 1337 - 1342

  • M. Shibata, K. Kawai, S. Kanazawa, A. Iizuka, S. Tachibana, S. Ohno, M. Honda
    Although compacted soil is widely used for constructing earth structures, the mechanism of compaction has not been explained using principles of soil mechanics. Therefore, designing and constructing such structures depend on empirical methods. In this study, we considered compaction as un-drained compression of unsaturated soil, and have simulated the compaction process using principles of unsaturated soil/water coupling problem. The constitutive model proposed by Ohno et al. (2007) and the soil-water retention characteristic curve model proposed by Kawai et al. (2000) were used for these simulations. When compared with static compaction tests performed by Kawai et al. (2003), the simulation results showed good agreement. Consequently, the shape of the observed compaction curve could be explained. The results achieved in this study can be applied to construction management on geotechnical engineering sites. © 2011 Taylor & Francis Group, London.
    Dec. 2011, Unsaturated Soils - Proceedings of the 5th International Conference on Unsaturated Soils, 2, 965 - 971

  • NOMURA SHUN, KAWAI KATSUYUKI, KANAZAWA SHIN'ICHI, TACHIBANA SHIN'YA, IIZUKA ATSUSHI
    神戸大学都市安全研究センター, Mar. 2011, 神戸大学都市安全研究センタ-研究報告, (15) (15), 21 - 28, Japanese
    Link to Kobe Univ. Repository (Kernel)

  • Hiroshi Ohkawa, Jiro Kuwano, Takafumi Nakada, Shinya Tachibana
    In order to investigate the deformation characteristics under a wide selection of stress history, ten series of stress probing tests on p′-constant shear stress plane on dense Toyoura sand are conducted by using hollow cylinder apparatus. This paper presents yielding behavior and non-coaxiality of Toyoura sand obtained from the tests. The stress probing tests consist of ten series of shearing tests each of which starts from systematically chosen individual initial stress point. Each initial stress point is subjected to load-unload stress history. The yielding characteristic is interpreted by means of a concept of multiple yield surfaces model which has three yield surfaces representing linearly elastic behavior limit, commencement point of rapid development in plastic strain and elasto-plastic range. As a result, an experimental evidence of the isotropic hardening, i.e., isotropic expansion of yield surface, induced by anisotropic loadings is obtained. This is what was tacitly assumed in the application of plastic flow rules. However, misalignment of directions between principal stress and principal plastic strain increment is observed. Moreover, plastic strain increment direction is found to be influenced by the given stress increment direction. These facts suggest the non-coaxiality between stress and plastic strain increment due to shear stress increment, even during monotonic loading with isotropic hardening. The plastic strain increment direction diverges from the normal direction to a surface which is a circle with its center nearly at the origin on p′-constant plane and which passes through the current stress point.
    Feb. 2011, Soils and Foundations, 51(1) (1), 179 - 190, English
    [Refereed]
    Scientific journal

  • 東北地方太平洋沖地震による埼玉県内の地盤災害事例
    桑野二郎, 橘伸也
    2011, 地盤工学会誌, 59(6) (6)
    Symposium

  • Liquefaction hazard zonation of alluvial soil in Saitama city, Japan
    Pokhrel, R.M, Kuwano, J, Tachibana, S
    2011, Proc. of the 5th International Conference on Earthquake Geotechnical Engineering, 10 - 13
    International conference proceedings

  • Soil liquefaction susceptibility zoning due to earthquake using GIS and geotechnical data
    Bhuyan, M.H, Pokhrel, R.M, Kuwano, J, Tachibana, S
    2011, Proc. of the 1st International Conference on Geotechnique, Construction Materials and Environment (GEOMAT2011), 154 - 160
    International conference proceedings

  • Liquefaction hazard zonation mapping of the Saitama City, Japan
    Pokhrel, R.M, Kuwano, J, Tachibana, S
    2011, Journal of Nepal Geological Society, 40, 67 - 74
    [Refereed]
    Scientific journal

  • Atsushi Iizuka, Yusuke Takayama, Shinya Tachibana, Shintaro Ohno, Ichizo Kobayashi, Katsuyuki Kawai
    Due to its low permeability and excellent expansion characteristics, bentonite is an excellent candidate with potential use as a buffer in the disposal of nuclear waste. Its expansion characteristics, activated by wetting, can be interpreted based on the full saturation line, depicted as a unique line on the density and the confining pressure relationship as proposed by Kobayashi et al. (2007). In addition, its elasto-plastic constitutive relation can also be formulated by introducing additional irreversible strain component describing the expansion of the montmorillonite present in the bentonite material. A constitutive model can consistently express the mechanical behavior of the compacted bentonite material from the unsaturated to the fully saturated state. This paper describes the density homogenization process that was conducted through a series of soil-water coupled elasto-plastic finite element simulations. Specifically, bentonite specimens, with different initial densities, were permeated with a constant water head. Stresses and strains developing in bentonite, particularly the density change, were carefully examined. A series of numerical simulations, performed on the two specimens, showed that specimens did not homogenize to a unique value of density upon reaching the fully saturated state. To confirm the simulation results, we carried out a series of experiments. The experimental results also support our simulation results. Copyright © 2011 by ASME.
    2011, Proceedings of the International Conference on Radioactive Waste Management and Environmental Remediation, ICEM, (PARTS A AND B) (PARTS A AND B), 949 - 954
    International conference proceedings

  • Shun NOMURA, Katsuyuki KAWAI, Shunsuke KAKUI, Shinya TACHIBANA, Shinichi KANAZAWA, Atsushi IIZUKA
    Japan Society of Civil Engineers, 2011, Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)), 67(2) (2), I_231 - I_240, Japanese
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Liquefaction potential mapping by using GIS and geotechnical data, a case study from Saitama city, Japan
    Pokhrel, R.M, Kuwano, J, Tachibana, S
    2010, Proc. of the 4th Japan-China Geotechnical Symposium, 542 - 545
    International conference proceedings

  • Liquefaction potential mapping of alluvial soil in Saitama City, Japan
    Pokhrel, R.M, Kuwano J, Tachibana, S
    2010, Proc. of the 12th International Summer Symposium, JSCE, 215 - 218
    Symposium

  • Prediction of maximum swelling deformation for compacted bentonite
    Shirazi, S.M, Kazama, H, Kuwano, J, Tachibana, S
    2010, International Journal of the Physical Sciences, 5(10) (10), 1537 - 1543
    [Refereed]
    Scientific journal

  • N. H. Giang, J. Kuwano, J. Izawa, S. Tachibana
    This study presents an evaluation of soil-geogrid interaction mechanisms. Pullout tests were carried out on different types of geogrid to evaluate the effects of transverse ribs and dilatancy characteristics of sand around the geogrid during unload-reload processes. The interaction was observed using particle image velocimetry and analyzed using a spatial discretization scheme in the finite element method to understand the dilatancy mechanism and the shear strain distribution. © 2010 Thomas Telford Ltd.
    2010, Geosynthetics International, 17(4) (4), 249 - 249, English
    [Refereed]
    Scientific journal

  • 築堤シミュレーションにおける設定条件が盛土内応力分布に及ぼす影響
    TANAKA MAHO, KAWAI KATSUYUKI, KANAZAWA SHIN'ICHI, TACHIBANA SHIN'YA, ONO SHINTARO, IIZUKA ATSUSHI, TAKEYAMA TOMOHIDE
    2010, 応用力学論文集(CD-ROM), 13, 423 - 430, Japanese
    [Refereed]

  • 締固め方法の違いが締固め土構造物の品質に及ぼす影響
    SHIBATA MASAKI, KAWAI KATSUYUKI, OZAKI SAKIKO, KANAZAWA SHIN'ICHI, TACHIBANA SHIN'YA, IIZUKA ATSUSHI
    2010, 応用力学論文集(CD-ROM), 13, 363 - 370, Japanese
    [Refereed]

  • Stress-strain and water retention characteristics of micro-porous ceramic particles made with burning sludge
    Kawai Katsuyuki, Iizuka Atsushi, Kanazawa Shinichi, Fukuda Akiko, Tachibana Shinya, Ohno Shintaro
    May 2009, Proc. Int. Symp. on Prediction and Simulation Methods for Geohazard Mitigation, pp339-345, English
    [Refereed]
    International conference proceedings

  • Banking simulation with the constitutive model for unsaturated soil
    Kawai Katsuyuki, Tanaka Maho, Kanazawa Shinichi, Tachibana Shinya, Ohno Shintaro, Iizuka Atsushi, Takeyama Tomohide
    神戸大学, Mar. 2009, Report of Research Center for Urban Safety and Security Kobe University, 13, 1 - 9, Japanese
    Link to Kobe Univ. Repository (Kernel)

  • Nguyen, G.H, Kuwano, J, Izawa, J, Seki, S, Tachibana, S
    The soil-geogrid interaction process was analyzed by the Particle Image Velocimetry furthermore spatial discretization scheme in finite element method to understand about the dilatancy mechanism and shear strain distribution during unloading-reloading process. In this test the geogrid was pushed back and forth at three stages of pullout test: before peak, at peak and at residual part to simulate the seismic activities. Results showed that the shear strain concentrated in front of transverse ribs and upper apart of pullout box. The dilative behavior appears in front of transverse ribs and contractive behavior exits at behind of these bars. The alternative soil dilatancy-contraction distribution in between the two transverse ribs can be seen throughout the length of geogrid.
    Japan Chapter of International Geosynthetics Society, 2009, ジオシンセティックス論文集, 24, 69 - 74, English
    [Refereed]
    Symposium

  • K. Kawai, A. Iizuka, S. Tachibana, S. Ohno
    It is empirical knowledge that vegetation can influence the behavior of earth structure. It prevents surface failure and erosion due to rain and wind, and contributes to the stability of earth structure. Moreover, it encourages water circulation with transpiration, fixes atmospheric nitrogen and carbon via photosynthesis, and improves the environment. Therefore, surface seeding is purposely performed when an earth structure, such as an embankment or an earth dam, is constructed. Typically, vegetation grows on unsaturated soil. Consequently, a constitutive model for unsaturated soil is needed for understanding the effects of vegetation on the ground. In this study, we focus on the effect of vegetation-induced water uptake. The effect of water uptake due to evapo-transpiration can be regarded as reduction of water content within soil and appropriately represented in simulation studies. The constitutive model proposed by Ohno et al. (2007) is used for the simulation. In this model, the effective degree of saturation is treated as a parameter expressing hardening/softening. Moreover, the 'root element,' where the reduction of water content occurs, is applied to the soil/water coupled analysis with unsaturated soil mechanics. To verify the applicability of this model, the accident in Poland where non-uniform settlement and building damage were caused by water uptake of vegetation was simulated. The results show that water uptake increased suction and induced non-uniform settlement. This method is effective for understanding the effects of vegetation on the ground. © 2009 IOS Press.
    2009, Proceedings of the 17th International Conference on Soil Mechanics and Geotechnical Engineering: The Academia and Practice of Geotechnical Engineering, 1, 526 - 529, English
    [Refereed]
    International conference proceedings

  • The critical state theory applied to porous rock considering the distructuration effects
    Tachibana, S, Iizuka, A, Kuwano, J
    2009, Proceeding of 6th Regional Symposium on Infrastructure Development, 1, 25

  • A finite element simulator for mechanical behavior of unsaturated earth structures exposed to evaporation and moisturization
    Kanazawa, S, Kawai, K, Iizuka, A, Ohno, S, Tachibana, S, Pipatpongsa
    2009, Proc. 4th Asia-Pacific Conf. on Unsaturated Soils
    [Refereed]

  • 土水連成有限要素解析プログラムを用いた静的締固めシミュレーション
    河井克之, 柴田昌輝, 金澤伸一, 橘伸也, 大野進太郎, 飯塚敦, 本田道識
    2009, 応用力学論文集, 12, 429 - 436

  • 耐塩害性地盤構造物及び塩害地盤浄化手法の検討
    河井克之, 野村瞬, 大野進太郎, T.Pipatpongsa, 橘伸也, 金澤伸一, 飯塚敦
    2009, 応用力学論文集, 12, 421 - 428

  • Static of granular media in wedge-shaped mound
    Pipatpongsa, T, Tachibana, S, Ohta, H
    2008, Proc. of Geo-Chiangmai 2008 An International Conference on Geotechnical Engineering, 269 - 274
    [Refereed]
    International conference proceedings

  • KANAZAWA Shinichi, TACHIBANA Shinya, KAWAI Katsuyuki, OHNO Shintaro, IIZUKA Atsushi
    Many of earth structures on the ground keep stability in unsaturated state. Moreover, these structures are exposed to drying and wetting conditions and changes in soil moisture always occur. Therefore, the constitutive model with unsaturated soil mechanics is needed for predicting the elasto-plastic behavior of the earth structures for a long term. The objective of this study is developing soil/water coupled F. E. analysis with unsaturated soil mechanics. In this study, the constitutive model proposed by Ohno et al. is used. Their model can express typical behavior of unsaturated soil, such as shrinkage on drying process, collapse on wetting process, and the effects of hysteresis on soil-water retention characteristic curve, and have the flexibility for dependencies on soil properties. Moreover, isoparametric element is applied on spatial discretization to preventing the dependency on mesh, which can be seen in the Akai and Tamura's method. This simulation method allows us precise prediction of the behavior of unsaturated earth structures.
    Japan Society of Civil Engineers, 2008, Journal of applied mechanics, 11(11) (11), 331 - 338, Japanese

  • KAWAI Katsuyuki, YAMADA Ryotarou, IIZUKA Atsushi, TACHIBANA Shinya, OHNO Shintaro
    Empirically, it is known that the vegetation influences on the earth structure. Kawai et al. focused on the effects of water uptake induced by the vegetation. They regarded it as an effect of decreasing soil moisture and applied the effect to unsaturated soil/water coupled F. E. analysis. In this study, the soil/water coupled F. E. analysis code is rearranged with the constitutive model for unsaturated soil proposed by Ohno et al.. In their model, the effective degree of saturation are applied as a parameter expressing stiffness of unsaturated soil to enable application of unsaturated soil mechanics to actual problem in geotechnical engineering site. To verify the applicability of soil/water coupled analysis, the accident that the vegetation uptake work brought about the non-uniform settlement of the ground and damaged the building in Poland are simulated. Consequently, it was found that the uptake increased suction and encouraged non-uniform settlement of ground surface. Its effects appeared prominently in a dry ground having low groundwater level and much uptake. This method is effective to understand the effects of vegetation.
    Japan Society of Civil Engineers, 2008, Journal of applied mechanics, 11(11) (11), 443 - 450, Japanese

  • 橘伸也, Djoko Soelarno, 飯塚敦
    神戸大学都市安全研究センター, 2008, 神戸大学都市安全研究センター研究報告, 12, 33 - 41, Japanese
    Link to Kobe Univ. Repository (Kernel)

  • Inhomogeneous Deformation Developing in a Clay Specimen
    Shinya Tachibana, Atsushi Iizuka, Katsuyuki Kawai, Ichizo Kobayashi, Thipapong Pipatopongsa, Hideki Ohta
    May 2007, Proc 16th Southeast Asian Geotechnical Conference, pp.289-296, English
    [Refereed]
    International conference proceedings

  • The salt disaster problem and its mathematical modeling
    IIZUKA Atsushi, KAWAI Katsuyuki, TACHIBANA Shinya, HONDA Michinori, FUJIKAWA Kazuhiko, THIRAPONG Pipatpongsa, WANG Weichuan
    Apr. 2007, Proc. 3rd Asian Conf. on Unsaturated Soils, pp.347-352, English
    [Refereed]
    Scientific journal

  • The influences of evapo-transpiration on the ground
    KAWAI Katsuyuki, IIZUKA Atsushi, TACHIBANA Shinya
    Apr. 2007, Proc. 3rd Asian Conf. on Unsaturated Soils, pp.359-364, English
    [Refereed]
    Scientific journal

  • KAWAI Katsuyuki, IIZUKA Atsushi, SHIMONAGA Katsuyuki, TACHIBANA Shinya
    It is known that the vegetation is effective in preventing slope failure. In this study, we focus on the vegetation uptake from ground and show the way to estimate its effects on the ground quantitatively. The effect of uptake can be regarded as reduction of water content within soil. The ‘root element’, where the reduction of water content occurs, is applied to the existing code of soil/water coupled finite element analysis with unsaturated soil mechanics. To estimate the effects of uptake, three kinds of conditions, such as the amount of uptake water, the initial degree of saturation of the ground, and groundwater level are provided. Consequently, it was found that the uptake increased suction and encouraged non-uniform settlement of ground surface. Its effects appeared prominently in a dry ground having low groundwater level and much uptake. This method is effective to understand the effects of vegetation.
    Japan Society of Civil Engineers, 2007, Journal of Applied Mechanics, JSCE, 10(10) (10), 375 - 381, Japanese
    [Refereed]

  • OHNO Shintaro, KAWAI Katsuyuki, TACHIBANA Shinya
    To predict the long term elasto-plastic behavior of unsaturated earth structures, the constitutive model, which can express the following typical behavior of unsaturated soil, is needed. One is shrinkage and stiffness increase due to suction increase, second one is collapse with stiffness decrease due to suction decrease, and the last one is the influences of suction history relating to the hysteresis of soil-water retention characteristics. In this study, a constitutive model of unsaturated soil applied the effective degree of saturation as parameter expressing stiffness was proposed. The model showed good agreement with the experimental results and the appropriateness of the model was demonstrated.
    Japan Society of Civil Engineers, 2007, Doboku Gakkai Ronbunshuu C, 63(4) (4), 1132 - 1141, Japanese
    [Refereed]

  • Numerical investigation on the failure criterion of normally consolidated clays
    TACHIBANA Shinya, IIZUKA Atsushi, KAWAI Katsuyuki, KOBAYASHI Ichizo, OHTA Hideki
    2007, International Journal for Numerical and Analytical Methods in Geomechanics, Vol.31, pp.809-833, English
    [Refereed]
    Scientific journal

  • Changes in the instantaneous shear modulus of normally consolidated clay with shear history
    IIZUKA Atsushi, TACHIBANA Shinya, KAWAI Katsuyuki, OHTA Hideki
    Apr. 2005, Soils and Founadtions, Vol.45, No.2, English
    [Refereed]
    Scientific journal

  • Corner Mode in the Sekiguchi-Ohta Model
    Pipatpongsa, T, Tachibana, S
    2005, Proc. of the Fifth Workshop on Safety and Stability of Infrastructures against Environmental Impacts, 21 - 24
    International conference proceedings

  • The non-coaxiality induced by stress rate on the instantaneous shear modulus of clays
    IIZUKA Atsushi, TACHIBANA S, KAWAI Katsuyuki, OHTA H
    Jan. 2005, in the book of Dislocations, Plasticity, Damage and Metal Forming : Material Response and Multiscale Modeling, Key-note-lecture, Proc. Of PLASTICITY'05 : the 11th International Symposium on Plasticity and its Current Applications, edited by A.S.Khan and A, 265-267, English
    [Refereed]
    Scientific journal

  • Tachibana Shinya, Iizuka Atushi, Ohta Hideki
    The Japanese Geotechnical Society, 2004, Proceedings of the Japan National Conference on Geotechnical Engineering, 39, 259 - 260

  • The change of instantaneous shear modulus associated with non-coaxiality of normally consolidated clays
    Atsushi Iizuka, Shinya Tachibana, Katsuyuki Kawai, Hideki Ohta
    Oct. 2003, Proc. International Workshop on Prediction and Simulation Methods in Geomechanics, pp.21-24, English
    [Refereed]
    International conference proceedings

  • Tachibana Shinnya, Iizuka Atsushi, Kawai Katsuyuki, Ohta Hideki
    本研究の目的は,室内試験を境界値問題と捉え,正規圧密粘土の非排水三軸圧縮・伸張試験,平面ひずみ圧縮試験をシミュレーションし,供試体の破壊挙動を解析的に検討することである.計算を行う道具として,有限変形弾塑性理論に基づく土/水連成3次元有限要素プログラムを開発した.シミュレーションにはMises型のCam-clayモデルを用いているため,解析解として得られる破壊強度に圧縮側,伸張側あるいはその中間で違いがあれば,一般に実験で得られるMohr-Coulombの規準は粘土の材料としての性質ではなく,他の要因に起因するものと考えられる.
    The Japanese Geotechnical Society, 2003, Proceedings of the Japan National Conference on Geotechnical Engineering, 38, 293 - 294

■ MISC
  • Mechanical Analysis of Sliding Phenomena Associated with Increased Pore Water Pressure in the Decollement
    高橋亮太, 橘伸也, 飯塚敦, 杉山友理
    2023, 地盤工学研究発表会(Web), 58th

  • デコルマ帯におけるスロースリップの弾塑性論的解釈
    小松美樹, 杉山友理, 橘伸也, 飯塚敦
    2017, 地盤工学研究発表会発表講演集(CD-ROM), 52nd

  • 深海底地盤からのサンプリング試料のモデル化に関する考察
    田窪尭, 岡田真理子, 杉山友理, 橘伸也, 飯塚敦
    2017, 地盤工学研究発表会発表講演集(CD-ROM), 52nd

  • 様々な応力条件におけるB値測定手法の繰返し載荷の影響
    上原拓真, 宇治亮佑, 杉山友理, 橘伸也, 飯塚敦
    2017, 地盤工学研究発表会発表講演集(CD-ROM), 52nd

  • Iizuka Atsushi, Sugiyama Yuri, Nomura Shun, Kawai Katsuyuki, Tachibana Shinya, Kanazawa Shin-ichi, Takeyama Tomohide
    This paper reports the investigation of ground contamination resulting from Tsunami due to the Great East Japan Earthquake.  We visited sites at suburbs of Sendai and Ishinomaki and took soil samples at the sites to analyse heavy metal contamination.  Herein, the sites st suburbs of Sendai were chosen as a typical area where any industrial facilities did not exit and the sites at Ishinomaki as a typical area where many industrial facilities were destroyed due to the Tsunami.  As conclusion, heavy metal contamination were not found resulting from destroyed industrial facilities but contaminated soils that had been settled under the sea were brought by Tsunami and covers the sites at Ishinomaki.
    National Committee for IUTAM, 2013, NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan, 62(0) (0), 110 - 110, Japanese

  • 東日本大震災における津波由来土壌汚染調査
    杉山友理, 野村瞬, 飯塚敦, 河井克之, 橘伸也, 金澤伸一, 竹山智英
    2012, 土木学会年次学術講演会講演概要集(CD-ROM), 67th

  • 地震対策型段差抑制工法の補強メカニズムに関する実験的検討
    石垣勉, 竜田尚希, 川崎始, 橘伸也, 桑野二郎, 太田秀樹
    2012, 土木学会年次学術講演会講演概要集(CD-ROM), 67th

  • 砂質土(変形2)(3.地盤材料,総括,<特集>第46回地盤工学研究発表会)
    橘 伸也
    地盤工学会, 2011, 地盤工学会誌, 59(12) (12), 25 - 25, Japanese

  • Settlement of highway embankment during construction
    桑野 二郎, 橘 伸也, 横田 聖哉, 中村 洋丈
    The purpose of this study is to estimate settlement of highway embankment during construction and compare it with the field data measured at the 90 m high embankment of the second Tomei Express way in Shizuoka. The mechanical characteristics have been briefly modeled referring to the results of one-dimensional compression tests on materials which are used in constructed embankment. Then, the amount of settlement of the embankment is estimated considering the effects of degree of compaction. It is found that the settlement at the center of the embankment can be estimated properly even by the simple method of one-dimensional calculation.
    埼玉大学総合研究機構地域オープンイノベーションセンター, 2008, Report of Comprehensive Open Innovation Center, Saitama University, (1) (1), 141 - 143, Japanese

  • Ohno Shintaro
    The Japanese Geotechnical Society, 2002, Proceedings of the Japan National Conference on Geotechnical Engineering, 37(0) (0), 1885 - 1886, Japanese

■ Books And Other Publications
  • 長江剛志、橘伸也、他 安全と共生の都市学シリーズ「若手論文集」
    COE出版, 2008

  • 沖村孝、橘伸也、他 安全と共生の都市学シリーズ「市民工学論」
    COE出版, 2008

■ Lectures, oral presentations, etc.
  • 地層処分におけるベントナイトオプションの検討 ベントナイトの物性および締固め特性
    山本陽一, 後藤孝裕, 横山信吾, 渡邊保貴, 新橋美里, 千々松正和, 山田淳夫, 小栗光, 伊藤歩夢, 橘伸也
    土木学会第74回年次学術講演会, Sep. 2019
    Oral presentation

  • 地層処分におけるベントナイトオプションの検討 数値解析的なアプローチ
    伊藤真司, 橘伸也, 渡邊保貴, 新橋美里, 横山信吾, 山本陽一, 後藤孝裕
    土木学会第74回年次学術講演会, Sep. 2019
    Oral presentation

  • 不飽和土弾塑性構成モデルパラメータの同定法とその検証
    林啓太, 松本昌祥, 伊藤真司, 橘伸也, 飯塚敦
    第54回地盤工学研究発表会, Jul. 2019
    Oral presentation

  • 東京海抜ゼロメートル地帯における液状化解析
    本田和也, 大山和貴, 竹山智英, 橘伸也, 飯塚敦
    第54回地盤工学研究発表会, Jul. 2019
    Oral presentation

  • ベントナイト緩衝材を対象とする不飽和弾塑性構成モデルの再現性評価
    太田有祐, 伊藤真司, 松尾颯大, 橘伸也, 飯塚敦
    第54回地盤工学研究発表会, Jul. 2019
    Oral presentation

  • 隙間充填過程を経たベントナイト緩衝材の変状シミュレーション
    橘伸也, 伊藤真司, 田中芳典, 飯塚敦, 石井智子, 今井政孝
    第54回地盤工学研究発表会講演集, Jul. 2019
    Oral presentation

  • ベントナイト緩衝材の膨潤圧発生機構についての解析的検討
    伊藤真司, 橘伸也, 飯塚敦
    第54回地盤工学研究発表会, Jul. 2019
    Oral presentation

  • 分離型解法を用いた土／水連成問題の検討
    北野井 智希, 竹山 智英, 飯塚 敦, 橘 伸也
    第53回地盤工学研究発表会, Jul. 2018, Japanese, 地盤工学会, 高松市, Domestic conference
    Oral presentation

  • 不飽和土の弾塑性構成モデルにおける硬化則に関するパラメータの推定手法
    松本 昌祥, 豊 香都樹, TACHIBANA SHINYA, IIZUKA ATSUSHI, 佐藤 毅
    第53回地盤工学研究発表会, Jul. 2018, Japanese, 地盤工学会, 高松市, Domestic conference
    Oral presentation

  • 東京海抜ゼロメートル地帯における地下水位変動に伴う液状化リスク
    本田 和也, 竹山 智英, 橘 伸也, 飯塚 敦
    第53回地盤工学研究発表会, Jul. 2018, Japanese, 地盤工学会, 高松市, Domestic conference
    Oral presentation

  • 地層処分における再冠水から超長期変質過程の力学−水理−化学連成解析
    酒井 城, 伊藤 真司, 橘 伸也, 飯塚 敦, 林 大介, 高沢 真由美, 小林 一三
    第53回地盤工学研究発表会, Jul. 2018, Japanese, 地盤工学会, 高松市, Domestic conference
    Oral presentation

  • 除荷過程における地盤材料の塑性軟化特性を考慮した弾塑性構成モデルの提案
    伊藤 真司, 橘 伸也, 飯塚 敦
    第53回地盤工学研究発表会, Jul. 2018, Japanese, 地盤工学会, 高松市, Domestic conference
    Oral presentation

  • デコルマ帯における変質を考慮したせん断シミュレーション
    前川 慎太郎, 麻生 勇人, 飯塚 敦, 橘 伸也, 竹山 智英, 杉山 友理
    第53回地盤工学研究発表会, Jul. 2018, Japanese, 地盤工学会, 高松市, Domestic conference
    Oral presentation

  • Elastoplastic prediction of clay-buffer homogenization due to swelling behavior
    Tachibana, S, Ito, S, Sakai, J, Iizuka, A, Ishii, T, Kawakubo, M, Kobayashi, I
    7th International Conference on Clays in Natural and Engineered Barriers for Radioactive Waste Confinement, Sep. 2017, English, Davos, Switzerland, International conference
    Poster presentation

  • 様々な応力条件におけるB 値測定手法の繰返し載荷の影響
    上原 拓真, 宇治 亮佑, 杉山 友理, 橘 伸也, 飯塚 敦
    第52 回地盤工学研究発表会, Jul. 2017, Japanese, 地盤工学会, 名古屋市, Domestic conference
    Oral presentation

  • 密度差のある二つの締固めベントナイト供試体の直列膨潤圧試験シミュレーション
    酒井 城, 伊藤 真司, 橘 伸也, 飯塚 敦, 石井 智子, 小林 一三
    第52 回地盤工学研究発表会, Jul. 2017, Japanese, 地盤工学会, 名古屋市, Domestic conference
    Oral presentation

  • 深海底地盤からのサンプリング試料のモデル化に関する考察
    田窪 尭, 岡田 真理子, 杉山 友理, 橘 伸也, 飯塚 敦
    第52 回地盤工学研究発表会, Jul. 2017, Japanese, 地盤工学会, 名古屋市, Domestic conference
    Oral presentation

  • 三成分系状態図による締固め土の強度評価
    松本 昌祥, 橘 伸也, 飯塚 敦
    第52 回地盤工学研究発表会, Jul. 2017, Japanese, 地盤工学会, 名古屋市, Domestic conference
    Oral presentation

  • 化学変質によるベントナイト緩衝材の超長期挙動に及ぼす初期密度分布の影響
    伊藤 真司, 神藤 卓哉, 橘 伸也, 飯塚 敦, 林 大介, 小林 一三, 高沢 真由美
    第52 回地盤工学研究発表会, Jul. 2017, Japanese, 地盤工学会, 名古屋市, Domestic conference
    Oral presentation

  • ベイズ推定を用いた被害予測における死亡者数再現関数の検討
    本田 和也, 橘 伸也, 飯塚 敦
    第52 回地盤工学研究発表会, Jul. 2017, Japanese, 地盤工学会, 名古屋市, Domestic conference
    Oral presentation

  • デコルマ帯におけるせん断破壊モデル
    麻生 勇人, 妹川 賢司, 杉山 友理, 橘 伸也, 飯塚 敦
    第52 回地盤工学研究発表会, Jul. 2017, Japanese, 地盤工学会, 名古屋市, Domestic conference
    Oral presentation

  • デコルマ帯におけるスロースリップの弾塑性論的解釈
    小松 美樹, 杉山 友理, 橘 伸也, 飯塚 敦
    第52 回地盤工学研究発表会, Jul. 2017, Japanese, 地盤工学会, 名古屋市, Domestic conference
    Oral presentation

  • ジオテキスタイルを用いた補強土の補強効果の評価手法
    飯塚 敦, 織田 裕至, 橘 伸也
    第52 回地盤工学研究発表会, Jul. 2017, Japanese, 地盤工学会, 名古屋市, Domestic conference
    Oral presentation

  • Research activities at RWMC on the bentonite re-saturation process (2) Laboratory and numerical evaluation
    Ito, S, Tachibana, S, Sakai, J, Iizuka, A, Kobayashi, I, Ishii, T, Kawakubo, M
    BEACON Initial Workshop, Jun. 2017, English, Kaunas, Lithuania, International conference
    Poster presentation

  • 放射性廃棄物地層処分におけるベントナイト緩衝材の変質評価
    伊藤 真司, IIZUKA ATSUSHI, TACHIBANA SHINYA
    第51回地盤工学研究発表会, Sep. 2016, Japanese, 地盤工学会, 岡山市, Domestic conference
    Oral presentation

  • Bearing capacity evaluation of samples prepared by sand pluviation
    Akram, I, Kuwano, J, Tachibana, S, Soe, A.A
    第51回地盤工学研究発表会, 2016
    Oral presentation

  • Effects of tie-rod on the behavior of confined-reinforced earth
    Ng’anzi, U.M, Hung, H.M, Kuwano, J, Tachibana, S
    第51回地盤工学研究発表会, 2016
    Oral presentation

  • Effects of lateral boundary condition on the behavior of confined-reinforced earth
    Hung, H.M, Ng’anzi, U.M, Kuwano, J, Tachibana, S
    第51回地盤工学研究発表会, 2016
    Oral presentation

  • Influence of footing orientation on geogrid reinforced soil under cyclic loading
    Soe, A.A, Tachibana, S, Kuwano, J, Akram, I
    第51回地盤工学研究発表会, 2016
    Oral presentation

  • Effect of hydraulic gradient on internal erosion in soil column test
    Yee, S.W, Kuwano, J, Tachibana, S, Kobayashi, A
    第51回地盤工学研究発表会, 2016
    Oral presentation

  • Effect of water infiltration on behavior of unsaturated compacted soil at constant deviatoric stress
    Rasool, A.M, Miyazaki, Y, Takamine, S, Kuwano, J, Tachibana, S
    第51回地盤工学研究発表会, 2016
    Oral presentation

  • Numerical and Analytical approaches to the problem of unsaturated ground
    Tachibana, S
    3rd International Symposium on, Advances in Civil and Environmental Engineering Practices, for Sustainable Development ACEPS2015, Mar. 2015
    [Invited]
    Keynote oral presentation

  • Effects of footing shape on load-settlement behavior of unreinforced sand and geogrid reinforced sand
    Aung Aung Soe, Shinya Tachibana, Jiro Kuwano
    第12回地盤工学会関東支部発表会, 2015
    Oral presentation

  • 高剛性補強路床の補強効果に関する模型実験
    山口純平, 橘伸也, 桑野二郎
    第11回地盤工学会関東支部発表会, 2014
    Oral presentation

  • Consolidation characteristics of landfilling waste samples in Japan: Effects of waste compositions and various mixing propotions
    Iqbal M. Rashid, Hiroyuki Oohata, Shoichiro Hamamoto, Shinya Tachibana, Ken Kawamoto
    第11回地盤工学会関東支部発表会, 2014
    Oral presentation

  • スリランカ廃棄物処分場における埋設廃棄物の地盤工学的性質：基礎物理特性と締固め特性
    大畠寛之, 川本健, 橘伸也, N.H. Priyankara, L.C. Kurukulasuriya
    第11回地盤工学会関東支部発表会, 2014
    Oral presentation

  • 乗算分解型の有限変形弾塑性理論に基づく関口・太田モデルの定式化
    橘伸也, 竹山智英
    第11回地盤工学会関東支部発表会, 2014
    Oral presentation

  • 種々の上載圧作用下における締固めベントナイトの吸水変形特性
    中川駿, 今成智史, 橘伸也, 桑野二郎
    第48回地盤工学研究発表会, 2013
    Oral presentation

  • 高剛性補強土路盤の変形特性に及ぼす層厚とプレストレス導入の効果
    桑野二郎, 橘伸也, 加藤拓未, 塩谷将史
    第48回地盤工学研究発表会, 2013
    Oral presentation

  • 真空圧密による粘土地盤の不飽和化
    橘伸也, 深野涼二, 桑野二郎
    第48回地盤工学研究発表会, 2013
    Oral presentation

  • 東日本大震災における津波由来土壌汚染調査
    杉山友理, 野村瞬, 飯塚敦, 河井克之, 橘伸也, 金澤伸一, 竹山智英
    土木学会年次学術講演会講演概要集(CD-ROM), Aug. 2012, Japanese

  • 平均有効応力一定排水せん断過程における砂の体積圧縮／膨張変遷条件
    橘伸也, 桑野二郎
    第61回理論応用力学講演会, 2012
    Oral presentation

  • 地震対策型段差抑制工法の補強メカニズムに関する実験的検討
    石垣勉, 竜田尚希, 川崎始, 橘伸也, 桑野二郎, 太田秀樹
    土木学会第67回年次学術講演会, 2012
    Oral presentation

  • ベントナイトの吸水過程における体積変化特性についての考察
    今成智史, 橘伸也, 桑野二郎, 中川駿
    第9回地盤工学会関東支部発表会, 2012
    Oral presentation

  • ジオグリッド／拘束材による補強土層の改良効果について
    加藤拓未, 橘伸也, 桑野二郎, 塩谷将史, 山口純平
    第9回地盤工学会関東支部発表会, 2012
    Oral presentation

  • Comparison of triaxial tests between conventional and vacuum consolidated clay
    Nguyen, Trung, Thanh, Wewalwalawala, Shiran Indika, Minakuchi, S, Tachibana, S, Kuwano, J
    第47回地盤工学研究発表会, 2012
    Oral presentation

  • Liquefaction risk analysis using multiple criteria
    Bhuyan, Md.Habibullah, Yamaoka, S, Kuwano, J, Tachibana, S
    第47回地盤工学研究発表会, 2012
    Oral presentation

  • ベントナイトの吸水過程における体積変化挙動に応力履歴が及ぼす影響
    今成智史, 坂口直也, 桑野二郎, 橘伸也
    第47回地盤工学研究発表会, 2012
    Oral presentation

  • 高剛性補強土工法における拘束部材の有効性について
    加藤拓未, 橘伸也, 桑野二郎, 小林光
    第47回地盤工学研究発表会, 2012
    Oral presentation

  • 繰返し荷重の移動に伴う埋設管の変形挙動
    岩元佑太朗, 東海林藤一郎, 桑野二郎, 橘伸也, 児子泰大
    第47回地盤工学研究発表会, 2012
    Oral presentation

  • 弾塑性構成理論に基づくベントナイトの吸水膨潤特性の表現
    高山裕介, 前田圭介, 飯塚敦, 河井克之, 大野進太郎, 橘伸也, 金澤伸一
    地盤工学研究発表会発表講演集(CD-ROM), 2011, Japanese

  • 荷重載荷条件下における飽和/不飽和地盤内における溶解物質の移動表現
    野村瞬, 角井駿祐, 河井克之, 橘伸也, 金澤伸一, 飯塚敦
    地盤工学研究発表会発表講演集(CD-ROM), 2011, Japanese

  • Mapping spatial variations of liquefaction potential in alluvial ground
    Pokhrel, R.M, Kuwano, J, Tachibana, S
    第46回地盤工学研究発表会, 2011
    Oral presentation

  • 繰返し載荷位置と周辺地盤密度の違いが及ぼす埋設管への影響
    岩元佑太朗, 桑野二郎, 橘伸也, 大嶺克治
    第46回地盤工学研究発表会, 2011
    Oral presentation

  • Performance of model screw and straight piles under axial load in dry Toyoura sand
    Malik, A. A, Kuwano, J, Tachibana, S, Maejima, T, Suzuki, N
    第46回地盤工学研究発表会, 2011
    Oral presentation

  • 第二東名高速道路加瀬沢盛土の築堤シミュレーション
    加藤拓未, 橘伸也, 桑野二郎, 中村洋丈
    第46回地盤工学研究発表会, 2011
    Oral presentation

  • Variation of water content in compacted bentonite at different stages of swelling behavior
    Deepak, C, Kuwano, J, Tachibana, S
    第46回地盤工学研究発表会, 2011
    Oral presentation

  • 浸水による不飽和地盤の変状シミュレーション
    今成智史, 橘伸也, 桑野二郎
    第46回地盤工学研究発表会, 2011
    Oral presentation

  • 締固め方法が粘性土の非排水せん断特性に及ぼす影響
    児子泰大, 橘伸也, 桑野二郎, Deng Jianliang
    第46回地盤工学研究発表会, 2011
    Oral presentation

  • 一次元圧縮・水浸試験結果から評価する盛土材の不飽和構成モデルパラメータ
    本間望巳, 橘伸也, 桑野二郎, 中村洋丈
    第45回地盤工学研究発表会
    Oral presentation

  • 締固め度の違いが高盛土の力学的挙動に及ぼす影響についての解析的検討
    清水大志, 橘伸也, 桑野二郎, 中村洋丈
    第45回地盤工学研究発表会, 2010
    Oral presentation

  • Effect of toe wing plate diameter on the bearing capacity of screw piles in dry sand
    Malik, A.A, Kuwano, J, Tachibana, S, Maejima T, Iwamoto, Y
    第45回地盤工学研究発表会発表講演集, 2010
    Oral presentation

  • Effects of curing stress and period on the strength and deformation characteristics of cement-mixed sand
    Rabbi, A.T.M.Z, Masaki, T, Kuwano, J, Tachibana, S, Win, J
    第45回地盤工学研究発表会, 2010
    Oral presentation

  • Box shear tests on weakly cemented sand
    Win, J, Kuwano, J, Tachibana, S, Rabbi, A.T.M
    第45回地盤工学研究発表会, 2010
    Oral presentation

  • Evaluation of the geogrid reinforced soil walls with unloading-reloading process
    Nguyen, H.G, Matsutani S, Kuwano, J, Izawa, J, Tachibana, S
    第45回地盤工学研究発表会, 2010
    Oral presentation

  • 埋設管の挙動に繰返し載荷位置が及ぼす影響
    竹内康就, 桑野二郎, 橘伸也, 岩元佑太朗
    第45回地盤工学研究発表会, 2010
    Oral presentation

  • A GIS-Based Liquefaction Susceptibility Zoning A case study from the Saitama City Japan
    Pokhrel, R.M, 桑野二郎, 橘伸也
    第45回地盤工学研究発表会, 2010
    Oral presentation

  • Effect of Salinity on Swelling Behavior of Compacted Bentonite
    Sakunwanich, W, Chhetri, D, 桑野二郎, 橘伸也, 風間秀彦
    第45回地盤工学研究発表会, 2010
    Oral presentation

  • Application of Kriging method of interpolation for liquefaction potential mapping
    Pokhrel, R.M, Kuwano, J, Tachibana, S
    第7回地盤工学会関東支部発表会, 2010
    Oral presentation

  • 載荷条件と周辺地盤密度が埋設管の変形挙動に及ぼす影響
    岩元佑太朗, 桑野二郎, 橘伸也, 竹内康就
    第7回地盤工学会関東支部発表会, 2010
    Oral presentation

  • 高盛土築堤後の力学的性状に締固め履歴が及ぼす影響についての解析的検討
    今成智史, 橘伸也, 桑野二郎, 清水大志
    第7回地盤工学会関東支部発表会, 2010
    Oral presentation

  • Effect of container boundary on vertical load of model piles in dry sand
    Malik, A.A, Kuwano, J, Tachibana, S, Maejima T
    第7回地盤工学会関東支部発表会, 2010
    Oral presentation

  • Effects of salt concentrations on swelling behavior and variation of water content in compacted bentonite
    Chhetri, D, Sakunwanich, W, Kuwano, J, Tachibana, S
    第7回地盤工学会関東支部発表会, 2010
    Oral presentation

  • 荷重載荷回数に注目した不飽和土静的締固めシミュレーション
    児子泰大, 橘伸也, 桑野二郎, 大野進太郎
    第7回地盤工学会関東支部発表会, 2010
    Oral presentation

  • 斜面形状による築堤時の発現応力の違い
    田中麻穂, 河井克之, 金澤伸一, 橘伸也, 大野進太郎, 飯塚敦
    土木学会年次学術講演会講演概要集(CD-ROM), Aug. 2009, Japanese

  • 土/水連成有限要素解析プログラムを用いた締固め曲線の表現
    柴田昌輝, 河井克之, 金澤伸一, 橘伸也, 大野進太郎, 飯塚敦
    地盤工学研究発表会発表講演集, Jul. 2009, Japanese

  • 気候条件に伴う塩害の被害及び対策
    野村瞬, 河井克之, 大野進太郎, PIPATPONGSA Thirapong, 橘伸也, 金澤伸一, 飯塚敦
    地盤工学研究発表会発表講演集, Jul. 2009, Japanese

  • 不飽和土弾塑性構成モデルを用いた築堤シミュレーション
    田中麻穂, 河井克之, 金澤伸一, 橘伸也, 大野進太郎, 飯塚敦
    地盤工学研究発表会発表講演集, Jul. 2009, Japanese

  • 高速道路高盛土の建設時における圧縮沈下特性
    桑野二郎, 橘伸也, 清水浩一, 中村洋丈
    第44回地盤工学研究発表会, 2009

  • 破砕によるコントラクタンシー特性変化を考慮した岩石材料の弾塑性構成モデル
    SAEKI Takuya, TACHIBANA Shinya, IIZUKA Atsushi
    第63回年次学術講演会概要集, Sep. 2008, Japanese

  • 汚泥焼成土の基礎力学特性
    渡瀬梓, AGUNG Djoko S, 河井克之, 飯塚敦, 橘伸也, 金澤伸一
    土木学会年次学術講演会講演概要集(CD-ROM), Aug. 2008, Japanese

  • 土/水連成有限要素解析を用いた各種外的要因による地盤内水分布変化
    寺島裕樹, 河井克之, 飯塚敦, 橘伸也, 金澤伸一
    地盤工学研究発表会発表講演集, Jun. 2008, Japanese

  • 植生の吸水作用が地盤の変形に及ぼす影響
    山田竜太郎, 河井克之, 飯塚敦, 橘伸也, 金澤伸一
    地盤工学研究発表会発表講演集, Jun. 2008, Japanese

  • 陰解応力積分法を導入した地盤構成式の検討
    金澤伸一, Pipatpongsa, T, 竹山智英, 橘伸也, 飯塚敦
    第5回地盤工学会関東支部研究発表会Geo-Kanto2008, 2008

  • ダイレタンシー特性の表現の異なる弾塑性構成モデルに対するせん断帯生成解析
    TACHIBANA Shinya, OHNO Shintaro, IIZUKA Atsushi, OHTA Hideki
    第42回地盤工学研究発表会講演概要集, Jul. 2007, Japanese

  • 境界端面の潤滑性に注目した粘土供試体のせん断シミュレーション
    三好絵里子, 橘伸也, 飯塚敦, 河井克之
    土木学会関西支部年次学術講演会講演概要集(CD-ROM), May 2007, Japanese

  • 陰解法アルゴリズムに基づく有限変形弾塑性有限要素解析
    Tachibana S, IIZUKA A, OHTA Hideki
    第40回地盤工学研究発表会講演集, Jul. 2005, Japanese

  • 正規圧密年度の瞬間せん断剛性の軸圧縮履歴依存性
    TAKAGI Tomoya, KISHIMOTO Tetsutaro, IIZUKA Atsushi, KAWAI Katsuyuki, TACHIBANA Shinya
    第59回年次学術講演会概要集, Sep. 2004, Japanese

  • 対数ひずみを用いた有限変形Cam-clayモデルの陰解法アルゴリズム
    TACHIBANA Shinya, IIZUKA Atsushi, OHTA hideki
    第39回地盤工学研究発表会講演集, Jul. 2004, Japanese

  • Mises規準から見た境界非排水粘土供試体の破壊シミュレーション―Mises規準かMohr‐Coulomb規準か―
    橘伸也, 飯塚敦, 河井克之, 太田秀樹
    地盤工学研究発表会発表講演集, Jun. 2003, Japanese

  • 土/水連性弾塑性動的有限要素解析手法の開発
    OHNO Shintaro, IIZUKA Atsushi, KAWAI Katsuyuki, TACHIBANA Shinya
    第37回地盤工学研究発表会講演集, Jul. 2002, Japanese

  • 関口・太田による弾塑性構成モデルへの下負荷面の導入
    TACHIBANA Shinya, OHNO Shintaro, IIZUKA Atsushi, KOBAYASHI Ichizo
    平成13年度土木学会関西支部年次学術講演会, 2001, Japanese

■ Affiliated Academic Society
  • 土木学会

  • 地盤工学会

■ Research Themes
  • 海溝沈み込みプレート表層デコルマ帯の固着域生成とすべりの地盤力学的解釈
    飯塚 敦, 橘 伸也
    日本学術振興会, 科学研究費助成事業, 基盤研究(B), 神戸大学, 01 Apr. 2021 - 31 Mar. 2024

  • ベントナイト力学要素試験の数値シミュレーション
    橘伸也
    (一財) 電力中央研究所, 2019 - 2019, Principal investigator

  • ベントナイト緩衝材の再冠水挙動の力学解析手法の検討
    橘伸也
    (公財)原子力環境整備促進・資金管理センター, 2019 - 2019, Principal investigator

  • 微細間隙構造と地下水流れを考慮した堆積岩の凍結挙動の定量的な評価手法の開発
    橘伸也
    科学研究費補助金／基盤研究(A), 2014 - 2019, Coinvestigator

  • ベントナイトの力学挙動に関する数値解析的検討
    橘伸也
    (一財) 電力中央研究所, 2018 - 2018, Principal investigator

  • ベントナイト緩衝材の再冠水過程に関わる力学解析手法の検討
    橘伸也
    (公財)原子力環境整備促進・資金管理センター, 2018 - 2018, Principal investigator

  • 長期的挙動の予測に関わる化学変質を考慮した力学解析手法の検討
    橘伸也
    (公財)原子力環境整備促進・資金管理センター, 2017 - 2017, Coinvestigator

  • 再冠水時の緩衝材の挙動に関わる力学解析手法の検討
    橘伸也
    (公財)原子力環境整備促進・資金管理センター, 2017 - 2017, Principal investigator

  • 長期的挙動の予測に関わる化学変質を考慮した力学解析手法の検討
    橘伸也
    (公財)原子力環境整備促進・資金管理センター, 2016 - 2016, Coinvestigator

  • 再冠水時の緩衝材の挙動に関わる力学解析手法の検討
    橘伸也
    (公財)原子力環境整備促進・資金管理センター, 2016 - 2016, Principal investigator

  • 塩害・地盤変状発生機構シミュレーションと抑制修復技術の総合化
    橘伸也
    科学研究費補助金／基盤研究(B), 2012 - 2016, Coinvestigator

  • 堆積岩の構造異方性を考慮した不飽和過程の変形と水分分布状態の連成挙動の定式化
    橘伸也
    科学研究費補助金／基盤研究(B), 2012 - 2016, Coinvestigator

  • アジア・エジプト地域の、土中水分変動による遺跡構造物の変形解析と修復技術研究
    渡邉 邦夫, 三村 衛, 長田 昌彦, 藤井 幸泰, 橘 伸也, 菊本 統, 小口 千明
    日本学術振興会, 科学研究費助成事業, 基盤研究(B), 埼玉大学, 2013 - 2015
    歴史的遺産は、大地震や大降雨などの自然災害に耐えて数百年以上残ってきたことから、遺跡の置かれた地域の環境に良く適合した技術を伝えている。いわば長期的に見てレジリエントな技術を伝えている意味で工学的にも貴重である。しかしながら、近年世界で急速に遺跡の劣化・崩壊が進んでいる。その原因の一つが、基礎地盤内の水分変動による地盤変形と塩類風化の促進である。これらは、とくに①乾季と雨季が繰り返し、雨季には地表が水浸する事もある東南アジア地域と、②最近の灌漑により地下水位の上昇が顕著なエジプトなどの乾燥地域で顕著である。本研究の目的は、これら両地域の代表的な遺跡構造物の地中水分変動による劣化・崩壊を地盤工学の最新知見により解明し、合理性の高い遺跡修復・保全技術を開発する事である。なお、本研究の進展により、横須賀ドライドックなどの明治初期の構造物を対象として、構造物変形モニタリング技術の開発も行う。 本年度は最終年度として、昨年度までの2年間の研究成果を踏まえ、次のような研究計画を立てた。エジプトでの研究は政変による社会混乱と治安悪化のため、現地での研究は差し控え、共同研究者であるメノウファイア大学理学部のGamal Kamh教授を招聘することによる連携研究とし、国内において昨年度持ち帰った塩類試料の分析を中心に実施することとした。タイ・アユタヤ遺跡において一昨年度取得したWat Yai Chai Mongkhon寺院とWat Langkha Khao寺院のストゥーパの3次元図と比較しうる2年経過後の3次元図を取得し、これらを比較することによって、変形モニタリングが可能かを詳細に検討することとした。また変形が明瞭に示された場合、その要因としての遺跡直下の地盤構造を把握するために、表面波探査の適用を検討した。 タイでの調査は、2015年11月に開催予定のISEEE(International Symposium on Engineering, Energy and Environment)に合わせて実施する予定であったが、研究代表者の急逝により頓挫した。研究代表者の意思を貫くためにも、別途予算を得て最後まで成果を出したいと考えている。

  • Efficient maintenance technology with a reliable evaluation of earth structure deterioration
    KUWANO Reiko, SAITO Yukiko, KOSEKI Junnichi, KUWANO Jiro, TACHIBANA Shinya, MORI Hirotoshi, MATSUMIYA Yosuke, KIKUCHI Yoshiaki, KUNO Haruhiko
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), The University of Tokyo, 01 Apr. 2010 - 31 Mar. 2014
    The main objective of the study is to investigate the mechanism of formation and extension of internal erosion and water pathway in the backfill of earth structure by water penetration due to repeated rainfall. In order to evaluate effects of soil grains escaping from the specimen, a special permeability test was conducted. When hydraulic gradient exceeded certain value, fine particles started to flow out of the specimen. Turbidity of the drained water can indicate the degree of currently progressing internal erosion. Even small degree of internal erosion caused significant decrease in penetration resistance.

  • ジオグリッド目合形状が補強地盤の支持特性に及ぼす影響
    橘伸也
    三井化学産資株式会社㈱, 2014 - 2014, Coinvestigator

  • 特殊格子形状を有するジオグリッドの補強効果に関する研究
    橘伸也
    ㈱NIPPO技術研究所, 2014 - 2014, Coinvestigator

  • ジオグリッド敷設による道路路盤の支持力特性の向上について
    橘伸也
    ㈱NIPPO技術研究所, 2014 - 2014, Coinvestigator

  • 不飽和土の弾塑性構成モデルの高度化と締固めシミュレーション技術への応用
    橘伸也
    (公社)前田記念工学振興会, 2013 - 2013, Principal investigator

  • 道路盛土の構造物／土工接合部における大規模地震発生後の車両走行性に関する補強路床の力学性能の評価
    橘伸也
    (公社)地盤工学会, 2013 - 2013, Principal investigator

  • 車両荷重を想定したジオグリッド補強路床の力学性能の検討
    橘伸也
    前田工繊㈱, 2013 - 2013, Coinvestigator

  • ジオグリッド拘束補強土の補強効果に関する実験検討
    橘伸也
    ㈱NIPPO技術研究所, 2011 - 2011, Coinvestigator

  • ジオグリッド補強土構造に関する模型実験
    橘伸也
    前田工繊㈱, 2011 - 2011, Coinvestigator

  • 塩害・地盤変状発生機構の解析と環境負荷汚泥焼成物を用いた防止技術の開発
    橘伸也
    科学研究費補助金／基盤研究(B), 2009 - 2011

  • 補強土構造物を対象とした被災後の残存性能評価及び復旧方法選定の最適化に関する研究
    橘伸也
    科学研究費補助金／基盤研究(B), 2008 - 2010, Coinvestigator

  • 高盛土の沈下特性に関する研究
    橘伸也
    ㈱高速道路総合技術研究所, 2009 - 2009, Coinvestigator

  • 高盛土の沈下に関する研究
    橘伸也
    ㈱高速道路総合技術研究所, 2008 - 2008, Coinvestigator

  • 橘 伸也
    科学研究費補助金／若手研究(B), 2007 - 2008, Principal investigator
    Competitive research funding

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