欢迎来到天天文库
浏览记录
ID:26609441
大小:3.85 MB
页数:91页
时间:2018-11-27
《fredlund边坡稳定未来讲义(精品)》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、WhatistheFutureforSlopeStabilityAnalysis?(AreWeApproachingtheLimitsofLimitEquilibriumAnalyses?)Dr.DelwynG.FredlundUniversityofSaskatchewan,CanadaSecondSymposiumandShortCourseonUnsaturatedSoilsandEnvironmentalGeotechnicsBudapest,HungaryNovember4-5,2003IntroductionLimitE
2、quilibriummethodsofsliceshavebeen“Good”forthegeotechnicalengineeringprofessionsincethemethodshaveproducedfinancialbenefitEngineersareoftensurprisedattheresultstheyareabletoobtainfromLimitEquilibriummethodsSoWhyChange?ThereareFundamentalLimitationswithLimitEquilibriumMe
3、thodsofSlices??TheboundariesforaFREEBODYDIAGRAMarenotknown-TheSHAPEfortheslipsurfacemustbeassumedTheLOCATIONofthecriticalslipsurfacemustbefoundbyTRIALandERRORSHAPEandLOCATIONarethedrivingforceforaparadigmshiftObjectivesofthisPresentation:Toshowthegradualchangethatiseme
4、rginginthewaythatslopestabilityanalysescanbeundertakenToillustratethebenefitsassociatedwithimprovedproceduresfortheassessmentofstressesinaslopeOutlineofPresentationProvideabriefSummaryofcommonLimitEquilibriummethodsalongwiththeirlimitations(2-D&3-D)TaketheFIRSTstepforw
5、ardthroughuseofanindependentstressanalysisTaketheSECONDstepforwardthroughuseofOptimizationTechniquesIsaLimitEquilibriumAnalysisanUpperBoundorLowerBoundSolution?LimitEquilibriumMethodsprimarilysatisfytherequirementsofanupperboundtypeofsolutionReason:theshapeofslipsurfac
6、eisselectedbytheanalystandtherebyadisplacementboundaryconditionisimposedLimitEquilibriumandFiniteElementBasedMethodsofAnalysesWWWWWWWWNLimitEquilibriumMethodofAnalysisSm=tadldlsndlFiniteElementBasedMethodofAnalysisldtadlQUESTION:HowcantheNormalStressatthebaseofaslicebe
7、mostaccuratelycomputed?ConsidertheFreeBodyDiagramsusedtocalculatetheNormalStress?AssumptionforallLimitEquilibriumAnalysisSoilsbehaveasMohr-Coulombmaterials(i.e.,friction,f',andcohesion,c')Factorofsafety,Fs,forthecohesivecomponentisequaltothefactorofsafetyforthefriction
8、alcomponentFactorofsafetyisthesameforallslices()[]msnsSFuFc=-+bfsb'tan'SummaryofAvailableEquationsAssociatedwithaLimi
此文档下载收益归作者所有