孤岛煤柱巷道围岩大变形破坏机理研究*张浩1,2，李英明1,2，陈天佑1,2（1.安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南232001;2.安徽理工大学矿业工程学院，安徽淮南232001）摘要：针对刘庄矿120502孤岛煤柱巷道回采期间出现的大变形破坏情况，通过现场监测、理论分析、数值模拟等方法研究巷道围岩塑性区发育特征，从塑性区的形成和演变过程阐释孤岛煤柱巷道大变形破坏机理。结果表明：巷道围岩塑性区发育形态受双向主应力比影响，当主应力比较大时，塑性区形态呈蝶形分布且成蝶前后对主应力比敏感程度不同；塑性区形态成蝶后蝶叶旋转角度与主应力方向相关；相对于普通工作面，孤岛工作面回采期间受采空区侧向及工作面超前应力集中的叠加影响，主应力比增大，在巷道周围形成高偏应力环境，且最大主应力向采空区一侧偏转，使蝶叶旋转至巷道顶底和两帮位置，造成巷道围岩大变形破坏。关键词：孤岛煤柱巷道；大变形；蝶形塑性区；叠加应力场；数值模拟中图分类号：TD313文献标志码：A文章编号：1008－8725（2023）03－033－05StudyonLargeDeformationFailureMechanismofSurroundingRockinIsolatedCoalPillarRoadwayZHANGHao1,2,LIYingming1,2,CHENTianyou1,2(1.StateKeyLaboratoryofDeepCoalMineMiningResponseandDisasterPreventionandControl，AnhuiUniversityofScienceandTechnology，Huainan232001，China；2.SchoolofMiningEngineering，AnhuiUniversityofScienceandTechnology，Huainan232001,China)Abstract：Inviewofthelargedeformationandfailureof120502isolatedcoalpillarroadwayinLiuzhuangmine,thedevelopmentcharacteristicsofplasticzoneofroadwaysurroundingrockarestudiedthroughon-sitemonitoring,theoreticalanalysisandnumericalsimulation,andthelargedeformationandfailuremechanismofisolatedcoalpillarroadwayisexplainedfromtheformationandevolutionprocessofplasticzone.Theresultsshowedthat:thedevelopmentshapeofplasticzoneofroadwaysurroundingrockisaffectedbytheratiooftwo-wayprincipalstress,whentheratioofprincipalstressislarge,theshapeofplasticzoneisbutterflydistribution,andthesensitivitytotheratioofprincipalstressisdifferentbeforeandafterbutterflyformation;therotationangleofbutterflyleafisrelatedtothedirectionofprincipalstress;comparedwiththeordinaryworkingface,du...
