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

《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》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

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-thawconditionsinthesurroundingrockwallofatunnelinpermafrostregionsAbstractBasedontheanalysesoffundamentalmeteorologicalandhydrologi

2、calconditionsatthesiteofatunnelinthecoldregions,acombinedconvection-conductionmodelforairflowinthetunnelandtemperaturefieldinthesurroundinghasbeenconstructed.Usingthemodel,theairtemperaturedistributionintheXiluoqiNo.2Tunnelhasbeensimulatednumerically.Thesimulatedresultsare

3、inagreementwiththedataobserved.Then,basedontheinsituconditionsofsirtemperature,atmosphericpressure,windforce,hydrogeologyandengineeringgeology,theair-temperaturerelationshipbetweenthetemperatureonthesurfaceofthetunnelwallandtheairtemperatureattheentryandexitofthetunnelhasb

4、eenobtained,andthefreeze-thawconditionsattheDabanshanTunnelwhichisnowunderconstructionispredicted.Keywords:tunnelincoldregions,convectiveheatexchangeandconduction,freeze-thaw.Anumberofhighwayandrailwaytunnelshavebeenconstructedinthepermafrostregionsandtheirneighboringareas

5、inChina.Sincethehydrologicalandthermalconditionschangedafteratunnelwasexcavated，thesurroundingwallrockmaterialsoftenfroze,thefrostheavingcauseddamagetothelinerlayersandseepingwaterfrozeintoicediamonds，whichseriouslyinterferedwiththecommunicationandtransportation.Similarpro

6、blemsofthefreezingdamageinthetunnelsalsoappearedinothercountrieslikeRussia,NorwayandJapan.Henceitisurgenttopredictthefreeze-thawconditionsinthesurroundingrockmaterialsandprovideabasisforthedesign，constructionandmaintenanceofnewtunnelsincoldregions.Manytunnels，constructedin

7、coldregionsortheirneighboringareas，passthroughthepartbeneaththepermafrostbase.Afteratunnelisexcavated，theoriginalthermodynamicallyconditionsinthesurroundingsareandthawdestroyedandreplacedmainlybytheairconnectionswithouttheheatradiation,theconditionsdeterminedprincipallybyt

8、hetemperatureandvelocityofairflowinthetunnel，thecoefficientsofconvectiveheattransferonthe