土木外文翻译原文和译文

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1、重庆交通大学土木工程专业（隧道与城市轨道交通工程方向）毕业设计外文翻译　　Aconvection-conductionmodelforanalysisofthefreeze-thaw　conditionsinthesurroundingrockwallofa　　tunnelinpermafrostregions　　　　　　　Abstract　　Basedontheanalysesoffundamentalmeteorologicalandhydrogeologicalconditionsatthesiteofatunnelint

2、hecoldregions,acombinedconvection-conductionmodelforairflowinthetunnelandtemperaturefieldinthesurroundinghasbeenconstructed.Usingthemodel,theairtemperaturedistributionintheXiluoqiNo.2Tunnelhasbeensimulatednumerically.Thesimulatedresultsareinagreementwiththedataobserv

3、ed.Then,basedontheinsituconditionsofsirtemperature,atmosphericpressure,windforce,hydrogeologyandengineeringgeology,theair-temperaturerelationshipbetweenthetemperatureonthesurfaceofthetunnelwallandtheairtemperatureattheentryandexitofthetunnelhasbeenobtained,andthefree

4、ze-thawconditionsattheDabanshanTunnelwhichisnowunderconstructionispredicted.　Keywords:tunnelincoldregions,convectiveheatexchangeandconduction,freeze-thaw.　　　AnumberofhighwayandrailwaytunnelshavebeenconstructedinthepermafrostregionsandtheirneighboringareasinChina.Sinc

5、ethehydrologicalandthermalconditionschangedafteratunnelwasexcavated，thesurroundingwallrockmaterialsoftenfroze,thefrostheavingcauseddamagetothelinerlayersandseepingwaterfrozeintoicediamonds，whichseriouslyinterferedwiththecommunicationandtransportation.Similarproblemso

6、fthefreezingdamageinthetunnels21　　　　　重庆交通大学土木工程专业（隧道与城市轨道交通工程方向）毕业设计外文翻译　　alsoappearedinothercountrieslikeRussia,NorwayandJapan.Henceitisurgenttopredictthefreeze-thawconditionsinthesurroundingrockmaterialsandprovideabasisforthedesign，constructionandmaintenanceofnewtu

7、nnelsincoldregions.　　　Manytunnels，constructedincoldregionsortheirneighbouringareas，passthroughthepartbeneaththepermafrostbase.Afteratunnelisexcavated，theoriginalthermodynamicalconditionsinthesurroundingsareandthawdestroyedandreplacedmainlybytheairconnectionswithoutth

8、eheatradiation,theconditionsdeterminedprincipallybythetemperatureandvelocityofairflowinthetunnel，thecoefficientsofconvectiveheattra