This study develops a micro-mechanics-based elastoplastic damage model within the framework of irreversible thermodynamics. In the model, damage is related to growth of micro-cracks, while plastic deformation is induced by frictional sliding along those cracks. The damage criterion and functions of thermodynamic force are used to describe the damage evolution of rocks and determine whether they are damaged. Time-dependent deformation of rock is also taken into account by considering subcritical growth of micro-cracks. For engineering application, the proposed model is implemented in the standard finite element code Abaqus as a user-defined material model (UMAT) by using a specific local integration algorithm. The accuracy of the proposed model is assessed by comparing numerical results with experimental data in conventional triaxial compression tests and triaxial creep tests. The proposed model is then used for simulating the displacement field, damage and plastic zones of the left bank high slope. The predicted results are in a good consistency with field monitored data.

这项研究在不可逆的热力学框架内建立了基于微力学的弹塑性损伤模型。在该模型中，损伤与微裂纹的增长有关，而塑性变形是由沿着这些裂纹的摩擦滑动引起的。用热力学力的破坏准则和函数来描述岩石的破坏演化并确定岩石是否被破坏。通过考虑微裂纹的亚临界增长，还可以考虑岩石随时间变化的变形。对于工程应用，建议的模型通过使用特定的局部集成算法在标准有限元代码Abaqus中实现为用户定义的材料模型（UMAT）。通过将数值结果与常规三轴压缩试验和三轴蠕变试验中的实验数据进行比较，可以评估所提出模型的准确性。然后将所提出的模型用于模拟左岸高边坡的位移场，损伤和塑性区。预测结果与现场监测数据具有很好的一致性。