Page 206 - 《水资源与水工程学报》2023年第2期
P. 206

!34 ; ! 2 "                       > ? @ A > B C D E                               Vol.34No.2
               2023 < 4 =               JournalofWaterResources&WaterEngineering                 Apr.,2023

            DOI:10.11705/j.issn.1672-643X.2023.02.26


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                 GHIJK:P642.1;TV213.4   LMNOP:A    LQRK:1672643X(2023)02020206
                         Hydro-thermocoupledmodeldrivenbydoublegradients
                                             forunsaturatedfrozensoil


                                        LQingshuo,ZHANGZhihong,DAIFuchu
            (KeyLaboratoryofUrbanSecurityandDisasterEngineering,MinistryofEducation,BeijingUniversityofTechnology,Beijing100124,China)
                 Abstract:ThegeologicaldisastersinthepermafrostregionsofTibetPlateauarecloselyrelatedtothewa
                 terredistributioncausedbythefreezingandthawingoffrozensoils ,whichistheresultofcomplex
                 hydro-thermocoupledprocessintrinsically.Thecurrenthydro-thermocoupledmodelsoffrozensoilare
                 mainlydesignedtodescribethewatermigrationprocessdrivenbythegradientofunfrozenmoisturecon
                 tent ,yettheeffectoftemperaturegradientonthecouplingprocessisrarelyconsidered.Basedonthe
                 classicalheattransferequationandseepagetheoryofunsaturatedsoil ,ahydro-thermocoupledmodel
                 drivenbydoublegradientsforunsaturatedfrozensoilwasestablished ,inwhichthecombinedinfluenceof
                 unfrozenwatercontentgradientandtemperaturegradientwasconsidered.Then,theproposedmodelwas
                 verifiedbyexperimentalresults ,afterwhichaseriesofnumericalsimulationswerecarriedoutonthe
                 hydro-thermoresponseofthesoilunderthreeenvironmentaltemperatures, -5, -10and -15℃.
                 Theresultsshowthatthedrivingeffectoftemperaturegradientonwatermigrationinthefreezingprocess
                 cannotbeignored.Duringthefreezingprocess ,thefreezingrategraduallyslowsdownduetothelatent
                 heatreleasedbythephasechangeofice-water.Thelocationofwateraccumulationisatthefrozenfront
                 formedatthebeginningoffreezingprocess.Furthermore ,thelowertheoutsidetemperature,thegreater
                 theinternalandexternaltemperaturedifference ,thedeeperthelocationwherewateraccumulates,and
                 thegreatertheamountofwatermigration.Inaddition ,themoisturecontentpresentsanSshapeddistri
                 butionwiththedepthduringthefreezingprocess.Specifically ,extremevaluesofmoisturecontentat
                 -5,-10and-15℃ areatthedepthof0.30,0.55and0.70m,andthecorrespondingincrementof

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