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岩石单轴压缩变形试验是地下工程勘察中的基本力学试验。本文根据混合片麻岩单轴压缩变形试验的峰前应力—应变曲线,把其破坏过程分为裂纹闭合阶段、线弹性变形阶段、裂纹稳定扩展阶段和裂纹非稳定扩展阶段,并采用滑点回归分析技术得到了混合片麻岩各阶段裂纹临界应力值,即:裂纹闭合应力为23MPa,裂纹起裂应力为45MPa,裂纹损伤应力为86MPa,最后进行了单轴压缩下混合片麻岩脆性破坏过程细观模拟分析,为工程支护设计和围岩破坏机理分析提供参考。
Rock uniaxial compression deformation test is the basic mechanics test in underground engineering investigation. Based on the pre-peak stress-strain curve of the uniaxial compression deformation test of mixed gneiss, the failure process is divided into crack closure phase, linear elastic deformation phase, steady crack growth phase and crack non-steady expansion phase, and the slippage regression The analytical results show that the critical stress values of the cracks in all stages of the mixed gneiss are as follows: the crack closure stress is 23MPa, the crack initiation stress is 45MPa and the crack damage stress is 86MPa. Finally, the brittle failure of mixed gneiss under uniaxial compression Meso-simulation analysis provides a reference for engineering support design and analysis of surrounding rock failure mechanism.