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采用离散元数值法研究断续节理扩展贯通机制对工程岩体的稳定性具有重要意义,为此引入应力强度因子,基于裂纹Ⅱ型断裂判据,提出了考虑岩桥渐进破坏特征的粘聚力弱化函数,将粘聚力弱化函数用FISH编程语言内嵌至UDEC中,并在变形块体内预设潜在节理面表征岩桥的破坏路径,按Mohr-Coulomb屈服准则进行节理扩展分析,实现了断续节理在不同压应力状态下的直剪试验模拟,且真实反映了断续节理中节理面开裂、贯通、扩展的全动态过程,数值仿真结果与已有的试验结果吻合较好,从而验证了该方法的正确有效性。
It is of great significance to study the stability of engineering rock mass by means of discrete element numerical method. The stress intensity factor is introduced for this purpose. Based on the criterion of crack type Ⅱ fracture, the cohesive force considering the gradual failure of rock mass is proposed Weakened function, the cohesion weakening function is embedded in the UDEC using FISH programming language, and the presupposed potential joint surface in the deformed block characterizes the failure path of the rock bridge. According to the Mohr-Coulomb yield criterion, The results show that this method can simulate the direct shear tests under different compressive stress conditions and reflect the full dynamic process of crack initiation, penetration and expansion of discontinuous joints. The numerical simulation is in good agreement with the existing experimental results. The correct validity.