Extended UH Model: Three-Dimensional Unified Hardening Model for Anisotropic Clays

AbstractExtended UH model is a three-dimensional elastoplastic constitutive model that builds on a modification of the UH model with a unified hardening parameter, to account for the effect of anisotropy and the influence of K0 consolidation on the stress-strain-strength behavior of clays. The combined effects of anisotropy and stress magnitude are considered through the minimum value of angles (α) made by the spatially mobilized planes (SMPs) and soil depositional plane. The original transformed stress tensor is revised by incorporating the anisotropic peak stress ratio Mα, which is defined as a function of α, with the stress tensor σij. The comparison with test results on San Francisco Bay Mud demonstrates the capability of the proposed anisotropic criterion. The UH model is extended to account for the combined effects of inherent anisotropy and K0 conditions on the stress-strain-strength response of anisotropic clays by incorporating the revised transformed stress tensor σij˜, the potential strength ra...

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