泥岩弹塑性损伤本构模型及其参数辨识

以连续介质力学和不可逆热力学为基础，将损伤引入到修正的Mohr-Coulomb准则中，建立了泥岩弹塑性损伤本构模型反映泥岩软硬化行为，通过构建损伤势函数导出了泥岩的损伤演化方程，编制了泥岩弹塑性损伤本构模型及其参数反演程序。并根据非排水条件下泥岩三轴试验结果，采用多目标函数优化反分析法获得了泥岩本构模型参数。研究成果表明，所提出的弹塑性损伤本构模型能有效地描述泥岩在不同应力状态下的力学特性。

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.