Focus
Mechanical and hydro-mechanical behaviors of fractured rock masses
When discussing the construction and the maintenance of tunnels and underground caverns and the slope stability, the mechanical and hydro-mechanical behaviors of fractured rock masses should be clarified. The mechanical and hydro mechanical behaviors of fractured rock masses are strongly affected by those of the rock joints and/or fractures. Through experimental works on single joints and/or fractures, the mechanical and hydro-mechanical behaviors of single joints are studied.
Related publications
- Kikumoto, M., Vu, P. Q. N., Yasuhara, H. and Kishida, K.: Constitutive model for soft rocks considering structural healing and decay, Computer and Geotechnics, 91, pp. 93, 103, 2017.
- Kiyoshi KISHIDA, Naoya TSUDA, Takao YANO, Hideaki YASUHARA: ：Experimental study on shear strength recovery of single rock joint under thermal conditions，Japanese Geotechnical Journal，11(1), 11-20, 2016.
- Kishida, K., Sawada, A., Yasuhara, H. Hosoda, T.: Estimation of fracture flow considering the inhomogeneous strcture of single rock fractures, Soils and Foundations, 53(1), 105-116, 2013.
Analysis on discontinuous rock by microfocus X-ray CT
Advanced approach for geological isolation of by-products after energy generation
When considering the geological isolation of high-level radioactive waste and CO2 geological storage, the integration of various types of information through geomechanics, rock mechanics, fluid mechanics, thermal dynamics, and geochemistry is required. The mechanical and hydro-mechanical properties of jointed rock masses are clarified through an advanced approach and fundamental experiments with iPSACC (interface for Pressure Solution Analysis under Coupled Conditions) coupling the thermal (T), hydro-mechanical (H), mechanical (M), and chemical (C) properties is developed.
Related publications
- Sho OGATA, Hideaki YASUHARA, Kiyoshi KISHIDA: Coupled THMC Simulator Incorporating Pressure Solution with Dual Porosity Model and Its Application to Long-term Flow Simulation of Fractured Rocks, Journal of the Society of Materials Science, Japan, Vol.67, No.3 pp. 310 – 317, 2018-03.
- Yasuhara, H., Kinoshita, N., Lee, D. S., Choi, J., Kishida, K.: Evaluation of mechanical and hydraulci propeties in sandstone induced by simulated mineral trapping of CO2 geo-sequestration, International Journal of Greengouse Gas Control, 56, 155 - 164, 2017.
- Yasuhara, H., Kinoshita, N., Ogata, S., Cheon, D.S., Kishida, K.: Copuled thermo-hydro-mechanical-chemical modeling by incorporating pressure solution for estimating the evolution of rock permeability, IJRMMS, 86, 104 - 114, 2016.
Time history of pore diameter due to pressure solution
Design, construction, and maintenance of geo-infrastructures and rock infrastructures
The effective design, safety construction, and smart maintenance of geo-infrastructures and rock infrastructures are studied here. For examples, when shallow overburden tunnel is to be excavated in an urban area, the auxiliary method that will be applied should be considered. When an area is to be excavated in deep underground, seepage and the huge earth pressure that will be encountered should be considered. For slope stability, the remote sensing system that actively uses InSAR and ICT is introduced.
Related publications
- Kai KONISHI, Yasuo SAWAMURA, Kiyoshi KISHIDA, Makoto KIMURA: EXPERIMENTAL STUDY ON THE INFLUENCE OF GROUND PRE-IMPROVEMENT ON SEISMIC BEHAVIOR OF SHALLOW OVERBURDEN TUNNEL, Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering), 75(2), pp. 184-197, 2019.
- Cui, Y., Kishida, K., Kimura, M.: Prevention of the ground subsidence by using the foot reinforcement side pile during the shallow overburden tunnel excavation in unconsolidated ground，Tunnelling and Underground Space Technology，63, pp. 194-204, 2017.
- Hideki SODA, Junji ISHIGURO, Koichiro OTAGAKI, Kiyoshi KISHIDA: Empirical Evaluation on Seepage of Fill-Dams Using Reservoir Water Level and Rainfall, Journal of Japan Society of Dam Engineers, 27(1), pp. 5 -15, 2017.
Excavation analysis on vertical shaft Pre-improving ground for shallow overburden tunnel
Clarification of seismic performance of reinforced earth wall and precast arch culvert
In order to realize the labor saving of the earthworks, the reinforced earth wall and the precast arch culvert have been positively applied in the domestic road structures. Through the dynamic centrifuge tests and the numerical analyses, these unknown seismic behaviors due to dynamic soil structure interaction are being investigated. Based on these approaches, we aim to clarify the seismic performance.
Related publications
- Sawamura, Y., Shibata, T., Kimura, M.: Mechanical role of reinforcement in seismic behavior of steel-strip reinforced earth wall，Soil and Foundations，59(3), pp. 710-725, 2019.
- Yuusuke MIYAZAKI, Yasuo SAWAMURA, Kiyoshi KISHIDA, Makoto KIMURA: DYNAMIC CENTRIFUGE MODEL TESTS ON SEISMIC PERFORMANCE IN CULVERT LONGITUDINAL DIRECTION OF HINGE-TYPE ARCH CULVERTS DUE TO PATTERNS OF EMBANKMENT SHAPE, Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering), 73(4), pp. 429-441, 2017.
- Yasuo SAWAMURA, Hiroyuki ISHIHARA, Kiyoshi KISHIDA, Makoto KIMURA: INVESTIGATION OF ASEISMIC DESIGN METHOD OF THREE-HINGE PRECAST ARCH CULVERT BASED ON SHAKING TABLE TEST AND NUMERICAL ANALYSIS, Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering), Vol.73, No.1, pp.1-10, 2017.
Investigations by geotechnical centrifuge and 3D FEM