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1、第22卷第12期巖石力學與工程學報22(12)：1943～19522003年12月ChineseJournalofRockMechanicsandEngineeringDec，2003*巖質(zhì)邊坡破壞機制有限元數(shù)值模擬分析鄭穎人趙尚毅鄧衛(wèi)東(后勤工程學院土木工程系重慶400041)(交通部重慶公路科學研究所重慶400067)摘要巖質(zhì)邊坡的穩(wěn)定性主要由其結(jié)構(gòu)面控制，采用有限元強度折減法對巖質(zhì)邊坡破壞機制進行了數(shù)值模擬分析。計算表明，破壞“自然地”發(fā)生在巖體抗剪強度不能承受其受到的剪切應力的地帶。分析表明，根據(jù)塑性力學破壞原理，采用有限元強度折減法有助于對巖質(zhì)邊坡破壞機制的理
2、解。算例表明了此法的可行性。關(guān)鍵詞巖石力學，巖質(zhì)邊坡破壞機制，有限元強度折減法，數(shù)值模擬分類號P642.22，O242.21文獻標識碼A文章編號1000-6915(2003)12-1943-10NUMERICALSIMULATIONONFAILUREMECHANISMOFROCKSLOPEBYSTRENGTHREDUCTIONFEM112ZhengYingren，ZhaoShangyi，DengWeidong1(LogisticalEngineeringUniversity，Chongqing400041China)2(ChongqingHighwayScienceRe
3、searchInstitute，Chongqing400067China)AbstractThestabilityofrockslopeismainlydeterminedbyitsdiscontinuityandrockbridge.However，thefailuremechanismofdiscontinuityandrockbridgehasnotbeenstudiedcomprehensively.Inthispaper，thestabilityanalysisofjointedrockslopeiscarriedoutbyshearstrengthreduc
4、tionfiniteelementmethod.Theelastic-perfectlyplasticmaterialisadaptedinthefiniteelementmethod.Withthestrengthreduction，thenonlinearFEMmodelofjointedrockslopereachesinstability，andthenumericalnon-convergenceoccurssimultaneously.Thesafetyfactoristhenobtainedbystrengthreductionalgorithm.Atth
5、esametimethecriticalfailuresurfaceandoverallfailureprogressarefoundautomatically.Thenumericalconvergenceornon-convergenceisrelatedtotheyieldcriterion.Comparisonismadeofseveralyieldcriteriaincommonuse.TheMohr-Coulombcriterionisundoubtedlythebest-knowncriterion.Butitsyieldsurfaceisanirregu
6、larhexagonalconeinprincipalstressspace.Itbringsdifficultytonumericalanalysis.ForconveniencetheMohr-CoulombcriterionisreplacedbyMohr-Coulombequivalentareacircleyieldcriterion.Throughaseriesofcasestudies，itisfoundthatthesafetyfactorobtainedbystrengthreductionFEMwithMohr-Coulombequivalentar
7、eacirclecriterionisfairlyclosetotheresultoftraditionallimitequilibriummethod(Spencer’smethod).Theresultshowsthatthediscontinuitycoalescencepatternisinfluencedbyitsstrength，length，location，andobliquity.Thefailureoccurs'naturally'throughthezoneinwhichtheshearstrengthofrocki
