This paper addresses a physical damage model and continuum damage-based fracture simulation procedure for simulating crack initiation, growth and cracks coalescence of quasi-brittle geomaterials. The model is proposed by using the principle of minimum dissipative energy combining with Drucker-Prager criterion, in which every parameter of the damage model has clear physical meaning. The procedure coupled with the damage model can be used to simulate competitive fracture process based on finite element method, which is implemented by using the secondary developing tool of ANSYS software. Two benchmark tests of the two pre-cracked rock-like disk specimens were carried. The predicted crack growth paths matched well with the corresponding experimental results. Thus the fracture simulation of dog-bone specimens with different sizes were carried to consider the scale effect, which support the effectiveness and ability of the developed procedure and damage model.

本文提出了一种物理损伤模型和基于连续损伤的断裂模拟程序，用于模拟准脆性地质材料的裂纹萌生、扩展和裂纹合并。该模型是利用耗散能最小原理结合Drucker-Prager准则提出的，损伤模型的每个参数都有明确的物理意义。该程序与损伤模型相结合，可用于基于有限元法的竞争性断裂过程模拟，利用ANSYS软件的二次开发工具实现。对两个预开裂的类岩石圆盘试样进行了两次基准测试。预测的裂纹扩展路径与相应的实验结果匹配良好。