Computational Multiphase Geomechanics

Numerical methods are very powerful tools for use in geotechnical engineering, particularly in computational geotechnics. Interest is strong in the new field of multi-phase nature of geomaterials, and the area of computational geotechnics is expanding.

Alongside their companion volume Computational Modeling of Multiphase Geomaterials (CRC Press, 2012), Fusao Oka and Sayuri Kimoto cover recent progress in several key areas, such as air-water-soil mixture, cyclic constitutive models, anisotropic models, noncoaxial models, gradient models, compaction bands (a form of volumetric strain localization and strain localization under dynamic conditions), and the instability of unsaturated soils.

The text also includes applications of computational modeling to large-scale excavation of ground, liquefaction analysis of levees during earthquakes, methane hydrate development, and the characteristics of contamination using bentonite. The erosion of embankments due to seepage flow is also presented.

Contents

Preface xiii

Acknowledgment xvii

Authors xix

1. Fundamental equations of multiphase geomaterials 1

2. Constitutive models of geomaterials 37

3. Governing equations and finite element formulation

for large deformation of three-phase materials 147

4. Strain localization in geomaterials 163

5. Instability analysis of water infiltration into an unsaturated

elasto-viscoplastic material 201

6. Numerical simulation of rainfall infiltration on unsaturated soil slope 221

7. Dynamic analysis of a levee during earthquakes 235

8. Numerical analysis of excavation in soft ground 253

9. Elasto-viscoplastic constitutive modeling of the swelling process of
unsaturated clay 271

10. Numerical analysis of hydrate-bearing subsoil

during dissociation 291

11. A numerical model for the internal erosion

of geomaterials 319

Index 331

Fusao Oka is a professor emeritus of Kyoto University and president of the

LIQCA Liquefaction Geo Research Institute. Until 1997, he was a professor

in the Department of Civil and Earth Resources Engineering of Kyoto

University. He specializes in computational geomechanics with particular

regard to constitutive equations, consolidation, liquefaction, and strain

localization analyses. He organized several international conferences and

workshops, such as the Fourth International Workshop on Localization and

Bifurcation Theory for Soils and Rocks (1997), the ISSMGE International

Symposium on Deformation and Progressive Failure in Geomaterials (1997),

the International Symposium on Prediction and Simulation Methods for

Geohazard Mitigation (2009), and the 14th International Conference of

IACMAG (2014). He has published more than 300 papers on geomechanics

and is a co-author of Computational Modeling of Multiphase Geomaterials

(CRC Press, 2012).

Sayuri Kimoto had been working on geomechanics as an associate professor

at Kyoto University for years. She is presently a professor of Osaka Sangyo

University. She specializes in the elasto-viscoplastic constitutive equations

of soils and the numerical analysis of multiphase geomaterials, such as the

behavior analysis of seabed ground due to the production of methane gas.

She is a co-author of Computational Modeling of Multiphase Geomaterials

(CRC Press, 2012).