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1、重慶交通大學土木工程專業(yè)（隧道與城市軌道交通工程方向）畢業(yè)設計外文翻譯Aconvection-conductionmodelforanalysisofthefreeze-thawconditionsinthesurroundingrockwallofatunnelinpermafrostregionsAbstractBasedontheanalysesoffundamentalmeteorologicalandhydrogeologicalconditionsatthesiteofatunnelinthecoldregions,acombined
2、convection-conductionmodelforairflowinthetunnelandtemperaturefieldinthesurroundinghasbeenconstructed.Usingthemodel,theairtemperaturedistributionintheXiluoqiNo.2Tunnelhasbeensimulatednumerically.Thesimulatedresultsareinagreementwiththedataobserved.Then,basedontheinsituconditio
3、nsofsirtemperature,atmosphericpressure,windforce,hydrogeologyandengineeringgeology,theair-temperaturerelationshipbetweenthetemperatureonthesurfaceofthetunnelwallandtheairtemperatureattheentryandexitofthetunnelhasbeenobtained,andthefreeze-thawconditionsattheDabanshanTunnelwhic
4、hisnowunderconstructionispredicted.Keywords:tunnelincoldregions,convectiveheatexchangeandconduction,freeze-thaw.AnumberofhighwayandrailwaytunnelshavebeenconstructedinthepermafrostregionsandtheirneighboringareasinChina.Sincethehydrologicalandthermalconditionschangedafteratunne
5、lwasexcavated，thesurroundingwallrockmaterialsoftenfroze,thefrostheavingcauseddamagetothelinerlayersandseepingwaterfrozeintoicediamonds，whichseriouslyinterferedwiththecommunicationandtransportation.Similarproblemsofthefreezingdamageinthetunnels20重慶交通大學土木工程專業(yè)（隧道與城市軌道交通工程方向）畢業(yè)設計
6、外文翻譯alsoappearedinothercountrieslikeRussia,NorwayandJapan.Henceitisurgenttopredictthefreeze-thawconditionsinthesurroundingrockmaterialsandprovideabasisforthedesign，constructionandmaintenanceofnewtunnelsincoldregions.Manytunnels，constructedincoldregionsortheirneighbouringareas
7、，passthroughthepartbeneaththepermafrostbase.Afteratunnelisexcavated，theoriginalthermodynamicalconditionsinthesurroundingsareandthawdestroyedandreplacedmainlybytheairconnectionswithouttheheatradiation,theconditionsdeterminedprincipallybythetemperatureandvelocityofairflowinthet
8、unnel，thecoefficientsofconvectiveheattransferonthetunnelwall，andtheg
