中文摘要：

在非连续变形分析方法中,可用虚节理表示岩石破坏过程中潜在的破坏路径,因此断续节理中节理面开裂、扩展、贯通过程认为是虚节理（岩桥）向实节理转化的过程,这一过程伴随着虚节理（岩桥）力学性质参数的弱化,且弱化程度受到虚节理向实节理转化程度的影响。因此,利用表征虚节理向实节理转化程度的虚节理连通率对虚节理力学性质参数的弱化规律进行研究,得出力学性质参数弱化函数;在此基础上对Jennings强度准则和最大抗拉强度准则进行处理,提出应用于非连续变形分析计算的断续节理强度形式;最后,将虚节理力学性质参数弱化规律和处理后的断续节理强度表达式运用于非连续变形分析计算程序中,实现对断续节理扩展过程的模拟算法。并通过剪切试验计算结果与室内试验结果的比较,验证该算法的正确性。

英文摘要：

Virtual joint is adopted in the discontinuous deformation analysis（DDA）,which can provide path for block failure and fracture development.Therefore,the failure process of jointed rock mass is a progress of initiation,extending and connecting of joints inside rock mass;and attenuation of virtual joint mechanical parameters represents the strength attenuation in the process of rock failure.The attenuation law of virtual joint mechanical parameters is studied by introducing the definition of virtual joint connectivity rate;and the attenuation formula of virtual joint mechanical parameters is established.According to the phenomenon of mechanical parameters attenuation in rock failure,the strength criterion（Jennings criterion and the maximum tensile strength criterion） for intermittent jointed rock masses are studied.Programming the attenuation law of virtual joint mechanical parameters and improved strength formula of intermittent joint into DDA to simulate the fracturing process of intermittent joint.At last,the method is validated by comparing the computation results with shear test results.