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1、DYNAMICBEHAVIOROFPORTALPARTOFTRAFFICTUNNELINHIGH-INTENSITYEARTHQUAKEAREASHENYusheng1,2,GAOBo2,WANGZhengzheng2,WANGYingxue21PostdoctoralStationofMechanics,SouthwestJiaotongUniversity,Chengdu610031,China;email:sys1997@163.com.2SchoolofCivilEngineering,SouthwestJiaotongUniversity,Che
2、ngdu610031,China;Abstract:Alarge-scaleshakingtabletestisaccomplishedonthedynamicresponseandfailuremodesofthetunnel.Theresultisthatthelargestdynamicresponseoftunnelstructureappearsattheside-wallandtheshearorfracturingdamageappearsattheinvert,whichisbasicallythesamedamagestatewithtu
3、nnelengineeringin5.12WenChuanearthquake.Theinternalforcevalueoftunnelstructureminishandthenumbersofcracksreduceaftertheshockabsorptionlayerissetupinmodeltest,andoptimizethestressstateoftunnel.Thesurfacecracksoftunnelmodelappearfirstlyatbothspandrelsanddevelopdiagonallyatthetunnele
4、ntrance.Thecracksarise"X"-shapedistributiononthesurfaceofthemodelsoil.Therearealotofcircumferentialcracksattunnelportalundertheconditionofdynamicloads,andmostoflongitudinalcracksorobliquecrackscanterminatewhenextendingtothecircumferentialcracks.Sothatitisproposedthatthereshouldbed
5、esignedmoreshockabsorptionseamsinthevicinityoftunnelportalinordertobepropitioustodampingtheearthquakeenergy.Keywords:dynamicbehavior,shakingtabletest,high-intensityearthquakearea1IntroductionItisregrettablethatthepeople'slivesandpropertyhavesufferedgreatlossesduring"5•12"Wenchuane
6、arthquakeinSichuanprovince.Atthesametimetheciviltransportengineeringaredamagedtosomeextent,includingthetunnelengineering.Tunneldamagesurveyshowsthatthetunnelportalsectionisthemosteasilytodestroyandisthemostweakparts(Li,2006).Especiallyatthehigh-intensityearthquakearea,thestability
7、analysisofthetunnelentrance,portalandsideslopewillbefocusedoninthefieldoftheanti-seismic8CopyrightASCE2009InternationnalConferenceonTransportationEngineer2009(ICTE2009)technologyresearch.Themechanicalcharacteristicoftunnelliningisaconsiderablycomplexprocess,thegradeofsurroundingro
8、ckisvariousandthereareavarietyofn