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1、某露天煤矿边坡失稳失稳破坏模式与稳定性分析黄明利，管晓明（北京交通大学土木建筑工程学院，北京100044）摘要：针对某露天矿边坡工程，介绍了工作帮和非工作帮边坡工程背景和滑坡现状，结合地形与地貌、工程地质和水文地质条件，分析了影响边坡稳定的主要因素及破坏模式。结果表明：持续的降雨和大规模露天开采是滑坡的外在因素，不利的地貌特征、岩土体的自身性质较差及软弱层构造是其内在因素，滑坡破坏模式表现为顺层滑坡、圆弧滑坡、圆弧-顺层滑坡和崩塌4种形式。运用基于有限单元法的MIDASGTS软件构建了边坡三维地质模型，采用强度折减法计算了稳定系数，进行了稳定性分析和评价，并采用毕肖普法对几种工程性质较差
2、的土层进行了边坡台阶高度参数的优化分析。结果表明：工作帮坡顶砂土位移较大，上部3个台阶均可能发生局部滑坡，稳定系数为1.4125，表明边坡整体保持稳定；非工作帮坡脚的高岭土层位移较大，滑坡结构面类型为高岭土层，加之地表重物堆载加剧滑动，稳定系数为0.8625，表明边坡已经发生失稳破坏。泥岩1和泥岩2在开挖高度为6米时可基本保持稳定；而砂土和粘性土层建议在低于6米台阶高的情况下进行开挖；粉砂岩1在台阶高为8米时都将保持稳定。关健词：露天矿边坡；影响因素；破坏模式；稳定性分析；台阶参数优化中图分类号：TD824文献标识码：AStudyAnalysisonofinstabilityandfai
3、luremodeandstabilityofanopen-pitmineslopeandsensitivityofrockmassparametersHUANGMing-li，GUANXiao-ming(SchoolofCivilEngineering,，BeijingJiaotongUniversity,，Beijing100044,，China)Abstract:Foranopenpitslopeengineering,describestheworktohelpandworktohelpnon-landslideslopeengineeringbackgroundandstatus
4、,combinedwiththeterrainandtopography,engineeringgeologyandhydrogeologicalconditions,analysisofthemainfactorsaffectingslopestabilityandfailuremode.Theresultsshowthat:Continuousrainfallandlarge-scaleopen-pitminingistoslidetheexternalfactors,unfavorabletopographyfeatures,thenatureofrockandsoilofthei
5、rownpoorandweaklayerstructureistheinternalfactors,landslidedamagealongthelandslidemodelperformance,roundlandslidearc,arc-beddinglandslidesandavalanchesfourkindsofforms.UsebasedonthefiniteelementmethodMIDASGTSsoftwarebuildthree-dimensionalgeologicalmodeloftheslope,calculatedusingastablestrengthred
6、uctionfactorforthestabilityanalysisandevaluation,andtheBishopmethodofusingseveralengineeringpropertiesofsoilwerelessSlopestepheightparameteroptimizationanalysis.Theresultsshowedthat:worktohelpoffsetthelargersandhill,thetopthreestepsarepossiblelocallandslides,stabilityfactorof1.4125,indicatingthat
7、theoverallslopestability;non-workingtohelpthelargerslopeofthekaolinlayerdisplacement,landslidesurfacestructuretypeofkaolinlayers,coupledwithincreasedslidingsurfaceheaploadweight,stabilityfactorof0.8625,indicatingthatth
