卸载条件下单裂隙岩石的破坏规律
Broken Rule of Single Cracked Rock Under Unloading Condition
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摘要: 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。Abstract: In order to study the failure rule of cracked rock under the unloading condition, on the basis of triaxial compression test using ideal rock with precast single crack whose angle is π/4, we use Mohr - Coulomb criterion to analyze the failure process of cracked rock, and obtain the broken rule of single cracked rock by calculation in the ideal condition. According to the calculation, the broken process is divided into three stages. In the beginning of unloading, rock deformation is the elastic deformation, so the rock strength is little affected by the cracked; in the middle of unloading, the crack is further broken and crack damage is given priority to expansion, and the stress concentration is emerged at crack tip; in the end, the new crack is produced in rock and the precast single crack is further broken until the rock can not afford the stress.
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Keywords:
- unloading /
- Mohr - Coulomb criterion /
- precast single crack /
- rock failure rule /
- rib spalling /
- roadway support
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