Parameter identification of new elastoplastic damage constitutive model for claystone

In order to depict the hardening and softening behaviours of clay, a new elastoplastic damage model with Mohr-Coulomb criterion is presented in the framework of the irreversible thermodynamics and nonlinear continuum mechanics. Furthermore, damage evolution equation is suggested based on the defined damage potential. Based on the developed numerical code, parameters for Boom clay elastoplastic damage model are obtained according to undrained triaxial consolidation tests by back analysis. The numerical simulation under various stress states shows that the proposed model is able to effectively depict the main features of mechanical behaviors of Boom clay.