ANISOTROPY OF CLAYS BASED ON BOUNDING SURFACE MODEL

Abstract eng:
This paper presents an improved soil model based on anisotropic critical state theory and bounding surface plasticity. The anisotropic critical state theory of Dafalias was extended into three-dimensional stress space. In additional to the isotropic hardening rule, an anisotropic (rotational.) and a distortional hardening rule were incorporated into the bounding surface formulation. An anisotropic tensor and its development with the stress system and volumetric strain rate were introduced to function as the anisotropic rule. The projection center that is used to map the actual stress point to the imaginary stress point was specified along an axis that represents the initial anisotropic state in the stress space. The model requires 11 material parameters and was validated against the isotropic and anisotropic undrained triaxial test results of Kaolin clay. The effects of anisotropy in compression and extension modes were well described by proposed model.

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