外文翻译--严寒地区隧道围岩冻融状况分析的导热与对流换热模型

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1、毕业设计外文翻译题目严寒地区隧道围岩冻融状况分析的导热与对流换热模型姓名陶正国学号0910611115所在学院土木工程与建筑学院专业班级09路桥1班指导教师范瑛日期2013年3月25日Aconvection-conductionmodelforanalysisofthefreeze-thawconditionsinthesurroundingrockwallofatunnelinpermafrostregionsAbstractBasedontheanalysesoffundamentalmeteorologi

2、calandhydrologicalconditionsatthesiteofatunnelinthecoldregions,acombinedconvection-conductionmodelforairflowinthetunnelandtemperaturefieldinthesurroundinghasbeenconstructed.Usingthemodel,theairtemperaturedistributionintheXiluoqiNo.2Tunnelhasbeensimulatednume

3、rically.Thesimulatedresultsareinagreementwiththedataobserved.Then,basedontheinsituconditionsofsirtemperature,atmosphericpressure,windforce,hydrogeologyandengineeringgeology,theair-temperaturerelationshipbetweenthetemperatureonthesurfaceofthetunnelwallandthea

4、irtemperatureattheentryandexitofthetunnelhasbeenobtained,andthefreeze-thawconditionsattheDabanshanTunnelwhichisnowunderconstructionispredicted.Keywords:tunnelincoldregions,convectiveheatexchangeandconduction,freeze-thaw.Anumberofhighwayandrailwaytunnelshaveb

5、eenconstructedinthepermafrostregionsandtheirneighboringareasinChina.Sincethehydrologicalandthermalconditionschangedafteratunnelwasexcavated，thesurroundingwallrockmaterialsoftenfroze,thefrostheavingcauseddamagetothelinerlayersandseepingwaterfrozeintoicediamon

6、ds，whichseriouslyinterferedwiththecommunicationandtransportation.SimilarproblemsofthefreezingdamageinthetunnelsalsoappearedinothercountrieslikeRussia,NorwayandJapan.Henceitisurgenttopredictthefreeze-thawconditionsinthesurroundingrockmaterialsandprovideabasis

7、forthedesign，constructionandmaintenanceofnewtunnelsincoldregions.Manytunnels，constructedincoldregionsortheirneighboringareas，passthroughthepartbeneaththepermafrostbase.Afteratunnelisexcavated，theoriginalthermodynamicallyconditionsinthesurroundingsareandthawd

8、estroyedandreplacedmainlybytheairconnectionswithouttheheatradiation,theconditionsdeterminedprincipallybythetemperatureandvelocityofairflowinthetunnel，thecoefficientsofconvectiveheattransferonthe