Page 196 - 《水资源与水工程学报》2024年第2期
P. 196

!35 "!2 #                         & ' ( ) & * + , -                               Vol.35No.2
               2024 $ 4 %               JournalofWaterResources&WaterEngineering                 Apr.,2024

            DOI:10.11705/j.issn.1672-643X.2024.02.22


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                 >FGHI:U452.1 2   JK<LM:A    JNOI:1672643X(2024)02019209
                     Optimaldesignofthermalinsulationlayerthicknessinpermafrost
                                tunnelbasedonhydrothermalcouplingmodel

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                                                                                              2
                                                           2
                                        1
                          GUOShuodong,WANGXiaochuan,ZHANGYaoyang,CHENZemeng
                             (1.SchoolofCivilEngineering,HenanPolytechnicUniversity,Jiaozuo454000,China;
                              2.CCCC-SHECFourthHighwayEngineeringCo.,Ltd.,Luoyang471000,China)
                 Abstract:Tomaintainthesurroundingrockinafrozenstate,permafrosttunnelsoftenincorporateanin
                 sulationlayerwithinthetunnelliningstructuretopreventfreeze-thawdamage.Thethicknessofthein
                 sulationlayerisacriticalparameteraffectingthestabilityandeconomicviabilityofpermafrosttunnel
                 structures.Addressingthisconcern,wedevelopedahydrothermalcouplingmodelthattakesseepageand
                 ice-waterphasetransitionintoaccout.ThismodelwasintegratedintoCOMSOLMultiphysicsforpracti
                 calapplication.FocusingonatunnellocatedinQinghaiProvince ,weconductedanoptimizationstudyof
                 theinsulationlayerthicknessatthetunnelentrancesection.Thefindingsrevealedthatthetunnelarch
                 positionwasidentifiedastheunfavorablepositionfortheoptimizationdesign,andthehighesttemperature
                 withinthetunnelexcavationoccurredonMay23ofthefirstyear ,whichwasdeemedunfavorableforthe
                 optimizationdesign.Moreover ,thehighesttemperatureattheunfavorablepositiondecreasedwiththein
                 creaseoftheinsulationlayerthickness ,andthroughafittingformula,theoptimalinsulationlayerthick
                 nesswascalculatedtobe7.2cm.Underthisoptimalthickness,thetemperatureofthesurroundingrock
                 behindthetunnelliningcanremainbelow0℃,effectivelypreventingfreeze-thawdamage.Inthede
                 signofthetunnel’sinsulationstructure,aninsulationlayerthicknessof7.2cmcanenhancethestability
                 ofthesurroundingrocktunnelstructure.
                 Keywords:tunnelinsulationlayerthickness;permafrost;hydrothermalcouplingmodel;temperature
                 field ;numericalsimulation

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