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应用岩石破裂过程分析系统(RFPA2D)软件,考虑岩石的非均匀性,对含不同裂隙倾角和分布密度的试件在单轴压缩下的破坏模式进行研究,探索了不同裂隙倾角和分布密度对多裂隙类岩石材料断裂破坏模式的影响规律.数值分析与实验结果基本一致,试样破坏是一个由渐变到突变的过程,总体破坏过程可大致分为弹性变形阶段、裂纹萌生和稳定扩展阶段、裂纹不稳定扩展至失稳阶段3个阶段;声发射事件也可对应分为线性阶段、增长阶段、突变阶段3个阶段.对比不同试件组发现,含多预制裂隙体的裂纹贯通方式和整体破坏方式由裂隙倾角起主导影响作用;裂隙分布密度对裂隙体整体破坏形式的影响因裂隙倾角的差异而有所不同.
Using the software RFPA2D, taking into account the heterogeneity of rock, the failure modes under uniaxial compression of specimens with different crack dip angles and distribution densities were studied. The effects of different fracture angles and distribution densities on the fracture toughness The fracture analysis is consistent with the experimental results. The sample failure is a process of gradual change to sudden change. The overall failure process can be roughly divided into the elastic deformation stage, crack initiation and stable expansion stage, and the crack The instability extends to three stages of destabilization stage.The acoustic emission events can be correspondingly divided into three stages of linear stage, growth stage and abrupt stage.Comparing the different specimen groups, it is found that the crack propagation mode and the total damage The mode is dominated by the fissure angle; the influence of fissure distribution density on the overall failure mode of the fissure body is different due to the difference in fissure angle.