孔、围压作用下断续单裂隙岩石破坏数值模拟

采用岩石破裂过程分析系统，研究了围压、孔压对含不同单裂隙分布脆性岩石的破坏影响规律，分析了岩样的裂纹扩展特征。结果表明：断续单裂隙的岩石力学性能显著低于完整岩样，但降低程度与裂隙参数密切相关，随着裂隙长度增加，岩石力学参数均呈降低趋势，而随着裂隙倾角的增加，峰值强度以及峰值应变均呈先减小后增加的趋势，且这种规律不受围压与孔压的影响；围压对岩石峰值强度有强化作用，但同等围压时，孔压对岩石峰值强度有弱化作用；裂隙长度越小或裂隙倾角越大的岩样，其裂纹扩展特征越不明显，且扩展过程受围压与孔压影响显著。研究结论对于认识具有断续节理裂隙岩体的变形破坏机理具有参考价值。

Numerical study on failure behavior of brittle rock with single interrupted fissure under confining and pore pressure

Numerical investigations were performed for brittle rock samples containing a single interrupted fissure under confining and pore pressure by a rock failure process analysis system.Based on the experimental results,the characteristics of crack propagation of the rock samples were obtained.The results show that mechanical parameters of the brittle rock are lower than intact rock samples and the lowering laws are closely related to fissure features.With the increase of fissure length,the mechanical parameters decrease,and with the increase of fissure angle,the peak strength and peak strain show a trend of decreasing and then increasing.The above relations are not influenced by confining and pore pressure.Confining pressure could increase the peak strength of rock,but the pore pressure has a contrary effect.When the fissure length is smaller or the fissure angle is larger,the crack propagation features tend to be inconspicuous,and the crack propagation is strongly influenced by confining and pore pressure.The research is helpful to understand the strength and deformation behavior of brittle rock containing a single interrupted fissure.