軟巖隧道開挖與支護(hù)數(shù)值分析.pdf

1、大連理工大學(xué)碩士學(xué)位論文軟巖隧道開挖與支護(hù)數(shù)值分析姓名：俞琳申請學(xué)位級別：碩士專業(yè)：防災(zāi)減災(zāi)工程及防護(hù)工程指導(dǎo)教師：鄒德高20050617軟巖隧道開挖與支護(hù)數(shù)值分析NumericalAnalysisonTunnelExcavationandSupportinSoftIbckAbstractAtpresentfiniteelementmethod(FEM)isbecomingamajortoolfortheanalysisoftunnel

2、sManyresearchresultscanbefoundintheliteratures，however，theinterfacialpropertiesofrockmassandshoteretelininghavemerelybeenassumedinmostnumericalstudiesNotethatthetimedependentinterracialpropertiesarestillunknown；Atpresent

3、，empiricalmethodsaregenerallyappliedtocarryoutthesupportdesignofrocktunnels，itissimpleandcursoryandunscientificTheinfluenceofexcavatingstepandexcavatinglengthislessconsideredFewworkspayattentiontothetimeeffectSoitisneces

4、sarytostudyanddiscusstotunnelexcavationandliningulteriorlyAtfirst，aelastoplasticfiniteelementanalysismodelWaSappliedtosimulatetheconventionalprocedureoftunnelexcavationandliningwiththefiniteelementBystudyingtheeffectsoft

5、heparameteroflining，attentionsa塢paidtotheproblems，such髂differentcoefficientsoffriction，liningthickness，burieddepth，lateralpressurecoefficientandrockcharacterTheeffectsofthesefactorsontheaxialforce，bendingmomentanddisplac

6、ementofliningareconsideredThemechanicsofitsperformancearestudiedbyresearchingthedeformationofexcavation，theforceofliningandthedistributionofaxialforceSecondlytheinstallationtimeofliningareanalyzedThirdlytheinteractionbet

7、weenthesurroundingrockmassandsupportandasignificanttimedependentvariationisstudiedFourthlyaelastoplasticfmiteelementanalysismodelwasappliedtosimulatetheconventionalpmcedureoftunnelexcavationandliningThenumericalmodelling

8、consideredvariousfactorsincludingexcavatingsequences，excavatingstep，excavatinglengthFinallyapracticalprojectisstudiedbythefiniteelementanalysismethodandthecalculatedresultsarecomparedwitllthemeasuredresultsThemainresearc