有限元强度折减法计算土坡稳定安全系数的研究

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1、C＼n*粪BP642自衄单位代码10618墨废交通戈謦硕士学位论文论女题目有限元强度折减法计算土坡稳定安全系数的研究．．．R．．．．．e．．．s．．e．．．a．．．．r．．chonCalculationofSoil-slopeSafetyF—a—ctor——by—StrengthReductionFiniteElementMethod导师姓g、职称申请学位门类々ng称：论文答辩RⅫ{位＆予单位；口院±姓g匿垂纠谢远光副教授工学道路与铁道工程2009年04月06日重庆交通大学菩辩蚕员会主席谭天贵*闻^．谭天贵2009年04月唐芬角巾对边坡的

2、影响较大；刚度参数E和V对边坡安全系数的影响较小，其影响甚至可以忽略不计，条件是土体弹性模量取值不能过小，若很小，很有可能导致部分土体变形过大而使有限元计算不收敛，最终对安全系数产生很大影响。工程经验表明若没有实际的测量数值，弹性模量E不宜小于1MPa。土体容重对边坡稳定性的利弊应根据具体的工程地质条件和边坡形状进行综合判断。关键字：土坡稳定性分析；有限元强度折减法；安全系数；ANSYSABSTRACTComparedwiththeconventionallimitequilibriummethodandthelimitanalytica

3、lmethod，thefiniteelementmethodbasedonshearstrengthreduction(SSR)techniquehasmanyevidentadvantagesinanalyzingthestabilityofslope．TheprimaryadvantageoftheShearstrengthreductionfmiteelementmethod(ssRFEMliSthatitCallobtainthemostdangerousslipsurfaceandthecorrespondingsafetyfa

4、ctorsoftheslopewithoutpredeterminingtheshapeandlocationoftheslipsurface，butonlybyreducingtheshearstrengthparametersoftherockandsoiloftheslopecontinuouslyuntiltheshearstressexceedstheshearstrengthandconsequentlyresultinthefailureoftheslope．Shearstrengthreductionfiniteeleme

5、ntmethodhastheadvantageofcombiningnumericaIanalysismethodwithtraditional1imitequilibriummethods．However,therearealSOmanyproblemsoftheSSRFEM．InordertosolveaboveproblemsanddeeplyinvestigatetheSSRFEM．thisthesismainlytakesthehomogeneoussoil—slopeascasestudies．andanalyzestheir

6、stabilitysafetyfactorsbymakinguseoftheSSIⅫEM．Someusefulconclusionsandimprovedmeasuresareasfollows：(1)Elastic．PerfectplasticmodelandNon．associatedflowruleCansatisfytheprecisionofslopeengineering．②Ⅲspaperproposesanewtransforillformulabetweenanydifferentyieldcriterionsbasedo

7、nDrucker-Prager(D．P)criterionsaccordingtotheirsemidiameterofprojectioncirclesonthe7cPlane．Theratioofthesemidiameteroftheprojectioncirclesonthe7【PlaneofdifferentD．Pyieldcriterionsisequaltotheratiooftheircorrespondingsafetyfactors．BecausetheratioiSonlyrelativetothefrictiona

8、ngleofthesoil，thisPaperliststhetransf01T11tablesaboutthefrequentlyusedfrictionanglesandtheircorr