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:1672643X(2023)02020206
Hydro-thermocoupledmodeldrivenbydoublegradients
forunsaturatedfrozensoil
LQingshuo,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 ,themoisturecontentpresentsanSshapeddistri
butionwiththedepthduringthefreezingprocess.Specifically ,extremevaluesofmoisturecontentat
-5,-10and-15℃ areatthedepthof0.30,0.55and0.70m,andthecorrespondingincrementof
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