Stability analysis of underground surrounding rock mass based on block theory  

基于块体理论的地下围岩稳定性分析

作　　者：LIN Jian-yun ZUO Yu-jun WANG Jian ZHENG Lu-jing CHEN Bin SUN Wen-ji-bin LIU Hao 林健云;左宇军;王剑;郑禄璟;陈斌;孙文吉斌;刘镐(Mining College,Guizhou University,Guiyang 550025,China;School of Resource and Environmental Engineering,Guizhou University,Guiyang 550025,China;School of Resources and Safety Engineering,Central South University,Changsha 410083,China;Priority Research Centre for Geotechnical Science and Engineering,The University of Newcastle,Callaghan,NSW,2308,Australia)

机构地区：[1]Mining College,Guizhou University,Guiyang 550025,China [2]School of Resource and Environmental Engineering,Guizhou University,Guiyang 550025,China [3]School of Resources and Safety Engineering,Central South University,Changsha 410083,China [4]Priority Research Centre for Geotechnical Science and Engineering,The University of Newcastle,Callaghan,NSW,2308,Australia

出　　处：《Journal of Central South University》2020年第10期3040-3052,共13页中南大学学报（英文版）

基　　金：Projects(51964007,51774101)supported by the National Natural Science Foundation of China;Project(2016-4011)supported by the High-level Innovative Talents Training Project in Guizhou Province,China;Project(2019-5619)supported by the Guizhou Mining Power Disaster Early Warning and Control Technology Innovation Team,China。

摘　　要：Evaluation of the performance of existing support in underground tunnels is of great importance for production and interests.Based on field investigation,the shape and number of joints and fractures were investigated in the mining area.Then,the stability of each structural blocks is analyzed by 3D wedge stability analysis software(Unwedge).Moreover,a new analysis method based on critical block theory is applied to analyze the stability of excavated laneways in continuous and discontinuous rock and monitor the stress changes in a fractured tunnel rock mass.The test results indicate that the 3D wedge stability analysis software for underground excavation can evaluate deep tunnel support.Besides,there is no direct relation between the size of the block and the instability of the tunnel.The support method,on large and thick key blocks,needs to be improved.In a broken tunnel section,U-shaped steel support can effectively promote the stress state of the surrounding rock.By monitoring the surrounding rock,it is proven that the vibrating string anchor stress monitoring system is an efficient and real-time method for tunnel stability evaluation.在深部巷道支护中对现有支护的评价至关重要,对安全生产具有重要意义。通过现场布置与测量,对矿区的节理裂隙进行了调查,确定了岩体中节理的形态和数量。然后,利用三维楔块稳定分析软件(Unwedge)对地下开挖的各个结构面块体进行稳定性分析。应用关键块体理论对连续和不连续岩体中开挖巷道的稳定性进行了分析,并对裂隙围岩的应力变化进行了监测。结果表明:三维楔形体稳定性分析软件可以对深部巷道支护进行评价;块体大小与巷道失稳没有直接关系,大厚度关键块的支护方法有待改进;在巷道软弱破碎段,U型钢支护能有效改善围岩应力状态。通过对巷道围岩的监测,证明了振动弦锚应力监测系统是一种高效、实时的地下围岩稳定性评价方法。

关 键 词：block theory Unwedge analysis software stress monitoring system support evaluation 

分 类 号：TD353[矿业工程—矿井建设]