围岩结构面对巷道稳定性的影响分析  

Analysis on influence of surrounding rock structural plane on stability of roadway

作　　者：陈金宇[1,2] 

机构地区：[1]煤炭科学研究总院开采设计研究分院,北京市朝阳区100013 [2]天地科技股份有限公司开采设计事业部,北京市朝阳区100013

出　　处：《中国煤炭》2014年第9期52-54,80,共4页China Coal

摘　　要：巷道围岩结构面与主应力方向的夹角以及结构面的倾角是巷道开挖以后围岩破坏模式的关键影响因素。为了掌握结构面对围岩强度的影响规律,根据现场实际地质条件,采用数值模拟软件PFC2D对巷道围岩的结构面进行预设,从结构面与主应力的方向关系、层理的倾角等因素对巷道围岩的破坏模式的影响进行分析。结果表明垂直主应力占主导作用时,层理倾角达到30°时是巷道围岩发生整体失稳的临界点,得出了层理倾角达到巷道破坏的起始部位、转移路线以及重点破坏区域,以此为依据,现场施工取得良好效果。The angle between the structural plane of roadway surrounding rock and direction of main stress and the angle of structural plane are both the key influence factors of surrounding rock failure in tunneling.In order to grasp the influence law of structural plane on the strength of surrounding rock,based on the actual geological conditions,PFC2D numerical simulation soft-ware is used to preset the structural plane of the surrounding rock,and the influence of direction relation of structural plane and main stress and angle of bedding on the failure modes of roadway surrounding rock are analyzed.The results show that when the vertical main stress is dominant with bedding angle of 30°,the surrounding rock will be overall instable,and the starting position of the bedding angle reaching roadway failure,the transfer route and key damage areas are ob-tained,which are the basis for good results of the site construction.

关 键 词：巷道围岩 结构面层理 结构面节理 层理倾角 PFC2D数值模拟 

分 类 号：TD353[矿业工程—矿井建设]