Constitutive modelling hydro-mechanical behavior of unsaturated loess with a loss of structure

抄録

This work develops a constitutive model for unsaturated nature loess considering the loss of structure upon wetting. the proposed model is an unsaturated kinematic hardening structure model (UKHSM) in the framework of Bishop's effective stress approach. The UKHSM is characterized by isotropic and kinematic hardening law in the bounding surface formulation, as earlier proposed by Muir et al. The UKHSM incorporates measuring structure degradation caused by moisture variation and describes the essential phenomena of pre-failure behavior of natural loess, including load&wetting induced collapse behaviors. CU, CD and CW triaxial tests on Henan loess have been modeled to validate good capability of the UKHSM.