煤矿安全2017，Vol.48Issue(3)：64-66,3.DOI:10.13347/j.cnki.mkaq.2017.03.017
卸载条件下单裂隙岩石的破坏规律
Broken Rule of Single Cracked Rock Under Unloading Condition
摘要
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.关键词
卸载/莫尔库伦准则/预制单裂隙/岩石破坏规律/煤壁片帮/巷道支护Key words
unloading/Mohr-Coulomb criterion/precast single crack/rock failure rule/rib spalling/roadway support分类
矿业与冶金引用本文复制引用
李兆欣,蒋威..卸载条件下单裂隙岩石的破坏规律[J].煤矿安全,2017,48(3):64-66,3.基金项目
国家重点基础研究发展计划(973计划)资助项目(2013CB227903) （973计划）
国家自然科学基金青年基金资助项目(51574244) （51574244）
