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为了研究卸载条件下裂隙岩石破坏规律,以理想岩石中预制单裂隙角度为π/4试件的三轴压缩试验为基础,利用莫尔-库伦准则对岩石裂隙破坏过程进行理论分析,得出了理想条件下的单裂隙岩石破坏规律。结果表明,单裂隙岩石破坏分为3个阶段:卸载初期,岩石变形处于弹性阶段,岩石裂隙对于岩石强度影响相对较小;卸载中期,岩石裂隙进一步发生破坏,裂隙破坏以扩张为主,并且裂隙尖端处产生应力集中;卸载后期,岩石产生新裂隙,预制裂隙进一步发生破坏,直至岩石整体破坏。
In order to study the failure rule of rock under unloading condition, based on the triaxial compression test of prefabricated single crack angle π / 4 specimen in ideal rock and the Mohr-Coulomb criterion, the fracture failure process of rock is theoretically analyzed. The Cracking Law of Single Cracked Rock under Ideal Conditions. The results show that the failure of single-fractured rock is divided into three stages: the initial stage of unloading, the deformation of the rock is in the elastic stage, and the influence of the rock fracture on the rock strength is relatively small. In the middle stage of unloading, the rock fracture further breaks down and the fracture damage mainly expands, Stress concentration occurs at the tip; during late unloading, new cracks are generated in the rock and prefabricated cracks are further damaged until the rock is destroyed as a whole.