Mechanism of dilatancy localization of clayey soils under shearing

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Localized deformation appearing in geo-materials has attracted many researchers with expecting the rational explanation of phenomena such as progressive failure and size effect of footing on bearing capacity. In the engineering practice, the specification of strength parameters in an important task in the design work of soil structure. the specimen in the laboratory tests is intended and generally assumed to represent a single point in the in-situ soil medium. However, since the uniformity of stress/strain distribution within the specimen is hardly achieved during shearing, the strength parameters thus obtained cannot be essentially regarded as material properties. In this research project, the mathematical formulation of initial-boundary value problem for soil mass was presented and the finite element code was developed considering pore water migration in the soil media. After examining the numerical stability of the finite element scheme, the triaxial compression shear test of a clay specimen is simulated under the plane strain condition. It is revealed that the shear band observed as the strain localization in clay specimen always develops with dilation, which can be called the localization of dilatancy. Moreover is examined the applicability of such non-linear soil/water coupled formulation in the engineering practice in this study. Particularly, the geosynthetic-reinforced soil structures were considered and their reinforcement mechanism was examined.