A5006650840- Geotechnical Engineering and Soil Mechanics
- Geotechnical Engineering and Underground Structures
- Geotechnical Engineering and Soil Stabilization
- Rock Mechanics and Modeling
- Grouting, Rheology, and Soil Mechanics
- Soil and Unsaturated Flow
- Geotechnical and Geomechanical Engineering
- Landslides and related hazards
- Dam Engineering and Safety
- Drilling and Well Engineering
- Methane Hydrates and Related Phenomena
- CO2 Sequestration and Geologic Interactions
- Seismic Imaging and Inversion Techniques
- Hydraulic Fracturing and Reservoir Analysis
- Nonlocal and gradient elasticity in micro/nano structures
- Fluid Dynamics Simulations and Interactions
- Climate change and permafrost
- Elasticity and Material Modeling
- Arctic and Antarctic ice dynamics
- Geotechnical Engineering and Analysis
- Numerical methods in engineering
- Seismic Waves and Analysis
- Earthquake and Tsunami Effects
- Earthquake and Disaster Impact Studies
- Cryospheric studies and observations
Kyoto University
2012-2023
Japan Society for the Promotion of Science
2016
Nikken Sekkei (Japan)
2016
Kyoto Katsura Hospital
2007-2013
Marymount University
1994-2013
Meijo University
2010
Korea Institute of Civil Engineering and Building Technology
2006
Japan Society of Civil Engineers
1980-2000
Gifu University
1990-1999
Japan Society
1992-1998
A cyclic elasto-plastic constitutive model based on a non-linear kinematic hardening rule for sand is proposed. Three points are incorporated into the model: new flow rule, cumulative strain-dependent characteristic of plastic shear modulus and fading memory initial anisotropy model. In order to verify its effectiveness, proposed was evaluated by means results series hollow-cylinder torsional tests with without an stress after isotropic anisotropic consolidation. The liquefaction strength...
Instability is usually considered as a problem of shear failure. Unstable behavior also observed during the consolidation process, whereby stress paths depart from failure line. In present study, an elasto-viscoplastic constitutive model extended to describe instability both around state, and away The connected structural degradation, formulated shrinkage overconsolidation boundary surface static yield in model. One-dimensional process clay has been simulated study effect degradation on...
Due to the 2011 off Pacific Coast of Tohoku Earthquake, which had a magnitude 9.0, many soil-made infrastructures, such as river dikes, road embankments, railway foundations and coastal were damaged. The dikes their related structures damaged at 2115 sites throughout Kanto areas, including Iwate, Miyagi, Fukushima, Ibaraki Saitama Prefectures, well Tokyo Metropolitan District. In first part present paper, main patterns embankments are presented reviewed based on in situ research by authors,...
Methane hydrates (MHs) have been recognized as an important material for use a new energy resource. Recently, not only MHs, but also carbon dioxide (CO2-hydrates), attracting attention from the viewpoint of CO2 storage in form CO2-hydrates. It is essential, therefore, to investigate mechanical behaviour gas hydrate-bearing sediments order achieve safe MH extraction and ensure long-term stability CO2-hydrate-storaged submarine sediments. In gain further knowledge CO2-hydrate-bearing...
A cyclic elastoviscoplastic constitutive model for clayey soils is proposed based on the nonlinear kinematic hardening rules and considering structural degradation. The performance of verified through undrained triaxial test simulation soft clay samples under monotonic loading conditions compression test. simulated results are compared with experimental data stress-strain relations stress paths. have shown a good agreement data, which indicates capability to reproduce behavior soils.
Summary Strain localization has been the subject of extensive theoretical and numerical studies over last four decades. The static dynamic strain in both dry water‐saturated geomaterials widely investigated numerically. However, on unsaturated have insufficient. This paper presents a computational model for nonlinear analysis multiphase geomaterials. discretization governing equations is achieved using finite element method deformation regime with updated Lagrangian description. An...
Abstract Dense sands, overconsolidated clays and soft rocks exhibit strain‐hardening strain‐softening behaviour in a certain range of confining pressure. The aim the present paper is to construct constitutive model rock that can describe not only behaviour, but also behaviour. An elasto‐plastic for derived by introducing stress history tensor preliminary idea was first reported reference, conference 16 . This complete version theory with interpretations experimental validations evaluated...
The results of an investigation soil liquefaction caused by the 1995 Hyogoken-Nambu earthquake are described. Massive and extensive occurred in coastal areas reclaimed land, old river beds, Holocene deposits from ponds. A man-made island weathered granite, or "Masado, " was also seriously damaged liquefaction. maximum distance epicenter to liquefied sites approximately 90 km. Several characteristics formation, strong motions recorded on Port Island, damage structures this discussed.
Abstract A two‐dimensional consolidation analysis of clay deposits was made with an elasto‐viscoplastic constitutive model and Biot's theory. One‐ problems were analysed numerically by the finite element difference methods. Results show that proposed method can describe effect sample thickness aging on phenomena. The behaviour a foundation during construction embankments also simulated.
Abstract It is well known that highly porous rocks under relatively high confining pressure succumb to volumetric compression with the emergence of so‐called compaction bands. These normally occur as perpendicular or very slightly inclined deformation bands respect direction most compressive principal stress. An experimental study diatomaceous mudstone, a structured and soft rock, was conducted demonstrate existence in laboratory tests. In these tests, local strain field on specimen's face...