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1、重慶交通大學(xué)土木工程專業(yè)（隧道與城市軌道交通工程方向）畢業(yè)設(shè)計(jì)外文翻譯1Aconvectionconductionconvectionconductionmodelmodelffanalysisanalysisofofthethefreezefreezethawthawconditionsconditionsininthethesurroundingsurroundingrockrockwallwallofofatunneltunnel

2、ininpermafrostpermafrostregionsregionsAbstractAbstractBasedontheanalysesoffundamentalmeteologicalhydrogeologicalconditionsatthesiteofatunnelinthecoldregionsacombinedconvectionconductionmodelfairflowinthetunneltemperature

3、fieldinthesurroundinghasbeenconstructed.UsingthemodeltheairtemperaturedistributionintheXiluoqiNo.2Tunnelhasbeensimulatednumerically.Thesimulatedresultsareinagreementwiththedataobserved.Thenbasedontheinsituconditionsofsir

4、temperatureatmosphericpressurewindfcehydrogeologyengineeringgeologytheairtemperaturerelationshipbetweenthetemperatureonthesurfaceofthetunnelwalltheairtemperatureattheentryexitofthetunnelhasbeenobtainedthefreezethawcondit

5、ionsattheDabanshanTunnelwhichisnowunderconstructionispredicted.Keywds:tunnelincoldregionsconvectiveheatexchangeconductionfreezethaw.Anumberofhighwayrailwaytunnelshavebeenconstructedinthepermafrostregionstheirneighbingare

6、asinChina.Sincethehydrologicalthermalconditionschangedafteratunnelwasexcavated，thesurroundingwallrockmaterialsoftenfrozethefrostheavingcauseddamagetothelinerlayersseepingwaterfrozeintoicediamonds，whichseriouslyinterfered

7、withthe重慶交通大學(xué)土木工程專業(yè)（隧道與城市軌道交通工程方向）畢業(yè)設(shè)計(jì)外文翻譯3model，simulatethefreezethawconditionsofthesurroundingrockmaterialbasedontheinsituconditionsofairtemperature，atmosphericpressure，windfceattheentryexitofthetunnel，theconditionsofh

8、ydrogeologyengineeringgeology.MathematicalmodelIndertoconstructanappropriatemodelweneedtheinsitufundamentalconditionsasabasis.HereweusetheconditionsatthesceneoftheDabanshanTunnel.TheDabanshanTunnelislototedonthehighwayfr

9、omXiningtoZhangyesouthoftheDatongRiveratanelevationof3754.783801.23mwithalengthof1530manalignmentfromsouthwesttontheast.Thetunnelrunsfromthesouthwesttothentheast.Sincethemonthlyaverageairtemperatureisbeneath0`Cfeightmont

10、hsatthetunnelsiteeachyeartheconstructionwouldlastfseveralyears，thesurroundingrockmaterialswouldbecomecoolerduringtheconstruction.Weconcludethatafterexcavationthepatternofairflowwoulddependmainlyonthedominantwindspeedatth

11、eentryexit，theeffectsofthetemperaturedifferencebetweentheinsideoutsideofthetunnelwouldbeverysmall.Sincethedominantwinddirectionisntheastatthetunnelsiteinwintertheairflowinthetunnelwouldgofromtheexittotheentry.Eventhought

12、hedominantwindtrendissoutheastlyinsummerconsideringthepressuredifferencethetemperaturedifferencethetopographyoftheentryexit，theairflowinthetunnelwouldalsobefromtheexittoentry.Additionally，sincethewindspeedatthetunnelsite

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