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1、FLAC/FLAC3DShortCourseItascaSoftwareTrainingCourseTongjiUniversityShanghai,ChinaOctober27-31,2008PeterCundall,YanhuiHan&RogerHartItascaConsultingGroup,Inc.TrainingScheduleOctober28,2008(morning)09:00-10:15Totalandeffectivestressanalysis,groundwatermodeling–Effective-stressapproachversusto
2、tal-stressapproachforundrainedanalysis10:15–10:30Break10:30-12:00Dynamicanalysis–Dynamicmodelingadviseandconsiderations:–Loadingandboundaryconditions–Materialresponseanddamping–Liquefactionmodels–Dynamicresponsesimulationofpile-supportedwharfsubjectedtoearthquakeloadingModelingApproachesf
3、orUndrainedAnalysisProblemcontextTheresponseofasoilshouldbeassessedforthespecifiedloadingcondition.Ingranularsoils,whenfulldrainageoccursevenastheloadisapplied,acoupledanalysisisusuallyrequired,especiallywhenplasticityisinvolved.Incontrast,foraclaymaterial,thetimerequiredfordissipationofe
4、xcessporepressuresdevelopedbyapplicationoftheloadmaybesolongthatundrainedconditionsmayexistnotonlyduring,butforalongtimeafter,loading.Inthistimescale,theinfluenceoffluidflowonthesystemresponsemaybeneglected.Ifthefluidisstiffcomparedtotheclaymaterial(Kw>>>K+(4/3)G,whereKandGaredrainedmoduli),
5、thegenerationofporepressuresundervolumetricstrainmaystronglyinfluencethesoilbehavior.Inthissituation,anundrainedanalysiscanbeapplied.ModelingapproachesforundrainedanalysesEffective-stressapproach–1.Thegroundwaterconfiguration(CONFIGgw)isadoptedwithano-flowcondition.2.Arealisticbulkmodulusisa
6、ssignedforthefluid.3.Drydensity,drainedbulkandshearelasticmoduliareprescribed.4.IfaMohr-Coulombmaterialisassumed:drainedcohesionandfrictionangleareusedintheinput.Thefluidisusuallymuchstifferthanthesoilandnumericalconvergencewillbeslow:-usefastflowlogicwithFLAC-thisfeaturewillsoonbeavailab
7、leforFLAC3DIftheprimaryemphasisisonthedeterminationoffailure,andassumingaMohr-Coulombmaterialwithnodilation,anotherapproachmaybeconsideredinFLAC:Total-stressapproach–1.Theproblemisanalyzedwithouttakingthefluidexplicitlyintoaccount.2.Wenowspecifyawetdensityandundraine
