正交各向异性损伤材料的Mohr-Coulomb条件

提出了正交异性损伤修正的Mohr-Coulomb条件，从对含裂纹单元的细观分析入手，通过均匀化（Homogenization)处理，将损伤张量引入到Mohr-Coulomb条件中，推导出相应的计算公式，采用的损伤模型考虑了裂纹的闭合效应，得出了新条件在二维层状岩石体中的简单应用，按本文提出的损伤材料的Mohr-Coulomb条件，计算得到了层状节理岩体侧压力－剪切强度曲线，结果的非线性特性与文献中的试验结果吻合，说明传统的侧压力与剪切强度的关系（试验中所获得的剪切强度值只是与过程有关的参数c,而不是材料参数c^t)。

Mohr- Coulomb criteria associated with materials of orthotropic damage

Mohr- Coulomb criterion associated with materials of orthotropic damage is presented in this paper. Second order damage tensor is adopted and the effect of crack- closure is taken into account. Based on the micro- mechanical analysis of representative element consisting of cracks, the orthotropic damage tensor is introduced into the Mohr-Coulomb criterion through homogenization. Both the degradation of shear strength and degradation of friction angle caused by damage are included in this model. With the theory established in this paper, the nonlinear diagram of pressure vs shear strength is obtained, and then it is indicated that the shear strength reported in references is only c*, a value occurred in the loading process, but not ct, the expected material parameter.