第46卷第6期2023年6月重庆大学学报JournalofChongqingUniversityVol.46No.6Jun.2023采动和降雨影响下含深大裂隙岩溶山体破坏机制刘新荣1a,1b,1c，冉乔1a,1b，熊飞1a,1b，李滨2，杨忠平1a,1b,1c（1.重庆大学a.土木工程学院；b.煤矿灾害动力学与控制国家重点实验室；c.库区环境地质灾害防治国家地方联合工程研究中心，重庆400045；2.中国地质科学院地质力学研究所，北京100081）摘要：为阐明采动和降雨入渗条件下含深大裂隙岩溶山体变形和破坏规律，以贵州省纳雍县普洒滑坡为例，通过块体离散元数值分析，探讨煤层开挖扰动和降雨入渗作用下含深大裂隙岩溶山体失稳破坏机制。结果表明，随着M10和M14煤层开采，山体上覆岩层向采空区方向下移，新生裂隙向坡表发育。工作面上覆岩层裂隙带高度随采空区范围的增大而增加，M10和M14开采结束后，裂隙带分别发育至30倍和40倍采高，坡顶深大岩溶裂隙向坡下扩展。降雨入渗后，上覆岩层裂隙带与深大岩溶裂隙贯通，在孔隙水压力作用下深大岩溶裂隙向坡表扩展形成贯通滑动面，岩溶坡体发生崩滑破坏。研究发现，地下采动是普洒老鹰岩山体变形破坏的控制因素，后续降雨是山体失稳的主要诱发因素。关键词：岩溶斜坡；裂隙；地下开采；降雨；离散元中图分类号：P954文献标志码：A文章编号：1000-582X(2023)06-001-13FailuremechanismofkarstmountainwithdeepandlargefissuresundertheinfluenceofminingandrainfallLIUXinrong1a,1b,1c,RANQiao1a,1b,XIONGFei1a,1b,LIBin2,YANGZhongping1a,1b,1c(1a.SchoolofCivilEngineering;1b.StateKeyLaboratoryofCoalMineDisasterDynamicsandControl;1c.NationalJointEngineeringResearchCenterofGeohazardsPreventionintheReservoirAreas,ChongqingUniversity,Chongqing400045,P.R.China;2.InstituteofGeomechanics,ChineseAcademyofGeologicalSciences,Beijing100081,China)Abstract:Toclarifythedeformationandfailurelawofkarstmountainwithdeepandlargefissuresundertheactionofminingandrainfall,bytakingthePusalandslideinNayongCountyofGuizhouProvinceasanexample,theinstabilityandfailuremechanismsofkarstmountainwithdeepandlargefissuresundertheactionofminingandrainfallwerediscussedthroughblockdiscreteelementnumericalanalysis.Theresultsshowthattheoverlyingstrataofthemountainmoveddowntothemined-outareawiththeminingofcoalseamsM10andM14,andnewfraclu...
