中文摘要：

基于弹性力学和断裂力学的理论对裂纹的起裂准则、扩展长度进行了理论分析。使用扩展有限元方法建立裂纹岩体模型,针对单裂纹在渗流应力状态下的扩展规律进行了数值模拟,对渗流-应力耦合下的裂纹扩展规律进行了研究。

英文摘要：

Based on the theory of elastic mechanics and fracture mechanics, analyzed initiation fracture criterion and the extend length. Numerical simulation to expansion of the single crack under seepage stress state laws was built,which used the extended finite element method. The law of crack propagation under coupled seepage and stress was studied.