工作面前方顶板渐进破坏的断裂力学分析  

Fracture Mechanics Analysis of Progressive Failure in Roof Ahead of Working Face

作　　者：左建平[1,2] 孙运江[1] 王金涛[1] 姜广辉[1] 陈岩[1] 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]中国矿业大学煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《煤矿开采》2016年第3期7-10,共4页Coal Mining Technology

基　　金：国家自然科学基金(51374215;11572343);霍英东教育基金会第十四届高等院校青年教师基金应用课题(142018);高等学校学科创新引智111计划(B14006);北京市科委重大科技成果转化落地培育项目(Z151100002815004)联合资助项目

摘　　要：对中兴煤矿3211工作面前方顶板20m深度范围内的岩层运动进行了现场钻孔实测,分析发现各岩层呈现出上下波动的运动特征。各测点振动幅度越靠近工作面就越大,由此提出了工作面前方顶板渐进运动破断机理,并对岩体内微裂纹渐进扩展演化机理进行了细观断裂力学分析。研究表明,超前影响远离工作面区段,围压较高,岩层内部微裂纹发生自相似扩展;靠近工作面区段,围压较低,岩层内部微裂纹发生弯折扩展,最终裂纹发生失稳。According borehole testing of roof strata movement in the depth range about 20m ahead of 3211 working face in Zhongxing coal mine, the movement features of up and down flow characters appeared in all rock layers, vibration amplitude increased with dis- tance that testing points to working face decreased, progressive movement failure principle of roof ahead of working face was put forward and then micro fracture mechanics analysis was applied on development and evolution mechanism of micro cracks in the inner rocks. The results showed that confining pressure was high and micro cracks inner rock extended self-similarity in the zone that ad- vanced influence aloof from working face, but as confining pressure was small, then cracks bending development appeared in the rock inside, instability appeared in the zone at the end, where closed to working face.

关 键 词：工作面前方顶板 渐进破坏 微裂纹扩展 断裂力学 

分 类 号：TD327[矿业工程—矿井建设]