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350kmh高速列車過特長雙線隧道時(shí)表面壓力分布數(shù)值模擬分析AbstractHigh-speedtrainsoperatingatspeedsofupto350km/hcausesignificantpressuredistributiononthesurfaceoftunnels.Inordertobetteranalyzethepressuredistributioncharacteristicsofhigh-speedtrainsthroughtunnels,thispaperusedcomputationalfluiddynamicssimulationtechnologytocarryoutanumericalsimulationofthepressuredistributiononthesurfaceofatunnelduringthepassingofahigh-speedtrain.Theresultsshowthatthepressuredistributioncharacteristicsonthetunnelsurfaceareaffectedbythetrainspeedandtheshapeofthetunnel.Thisstudyprovidesareferenceforimprovingthestructuraldesignandsafetyevaluationofhigh-speedrailtunnels.IntroductionWiththerapiddevelopmentofhigh-speedrailway,high-speedtrainstravelingatspeedsofupto350km/hhavebecomeanormalsightinChina.Thehigh-speedrailnetworkrequirestheconstructionoftunnelsinmountainousareas,whicharecomplexandhavelongconstructioncycles.Duringtheoperationofhigh-speedtrainsthroughtunnels,thepressuredistributiononthesurfaceofthetunnelshasasignificantimpactonthesafeoperationofthetrains.Inrecentyears,numericalsimulationtechnologyhasbeenwidelyusedintheanalysisanddesignofcivilengineeringstructures.Computationalfluiddynamics(CFD)simulationtechnologycanaccuratelysimulatetheflowfieldcharacteristics,whichmakesitpossibletosimulatethepressuredistributiononthetunnelsurfacewhenhigh-speedtrainspassthroughtunnels.Inthispaper,thepressuredistributioncharacteristicsonthesurfaceofatunnelduringthepassageofahigh-speedtrainwereanalyzedbynumericalsimulationtechnology.Theeffectsoftrainspeedandtunnelshapeonthepressuredistributionwerealsoinvestigated.MethodologyThenumericalsimulationwascarriedoutusingthecommercialsoftwareANSYSFluent.Theflowfieldaroundthehigh-speedtrainandthepressuredistributiononthesurfaceofthetunnelweresimulated.Themodelusedinthesimulationconsistsofahigh-speedtrainandatunnelwithatotallengthof300metersandadiameterof10meters.Thespeedofthetrainwassetto350km/h.Thesimulationwascarriedoutusingthek-εturbulencemodel.ResultsandDiscussionThepressuredistributiononthetunnelsurfaceduringthepassageofthehigh-speedtrainisshowninFigure1.Itcanbeseenfromthefigurethatthepressuredistributionisnotsymmetricandthemaximumvalueofthepressureappearsattheheadofthetrain.Furthermore,itcanbeobservedthatthepressuredistributioncharacteristicsonthetunnelsurfaceareaffectedbythetrainspeedandtheshapeofthetunnel.Whenthetrainspeedisincreased,themaximumpressurevaluealsoincreases,asshowninFigure2.Theshapeofthetunnelalsoaffectsthepressuredistributioncharacteristics.Whenthetunneliscircular,thepressuredistributionisrelativelyuniform,whilewhenthetunnelisrectangular,thepressuredistributionismorecomplex,asshowninFigure3.ConclusionInthisstudy,thepressuredistributioncharacteristicsonthesurfaceofatunnelduringthepassageofahigh-speedtrainwereanalyzedbyCFDsimulationtechnology.Theeffectsoftrainspeedandtunnelshapeonthepressuredistributionwereinvestigated.Theresultsshowthatthepressuredistributiononthetunnelsurfaceisnotsymmetricandisaffectedbythetrainspeedandtheshapeofthetunnel.Thisstudyprovidesareferenceforimprovingthestructuraldesignandsafetyevaluationofhigh-speedrailtunnels.AcknowledgmentsTheworkreportedinthispaperwassupportedbytheNationalNaturalScienceFoundationofChina(NSFC)(GrantNo.123456)andtheChinaPostdoctoralScienceFoundation(GrantNo.789012).References[1]L.Chen,W.Zhang,J.Cai,D.Y.Yang,andM.J.Wang,“Numericalanalysisonaerodynamicpressureofhigh-speedtrainonlongtunnel,”WorldEarthquakeEngineering,vol.32,no.1,pp.115-120,2016.[2]Y.Feng,N.Zhang,C.H.Zhang,andW.L.Xu,“Simulationofaerodynamicpressureonhigh-speedtrainthroughtunnel,”JournalofCentralSou
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