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Engineeringcharacteristicsandtemperaturecontrolofphasechange
materialandgravelmixedsoilforcorewallanti - freezing
LIUDonghai,DAIHuaijian,ZHENGHan
(StateKeyLaboratoryofHydraulicEngineeringSimulationandSafety,TianjinUniversity,Tianjin 300350,China)
Abstract:Core - wallconstructionofagravellysoilrockfilldamincoldregionusuallyfacesthefreeze - thawchal
lenge.Incurrentpractice ,itiscommontocoversoilwiththermalinsulationmaterialtopreventcorewallfrom
freezing.However,thereleaseandreclaim processofthermalinsulationmaterialeasilyinterferethecore - wall
compactionprocess ,whichwouldreducetheeffectiveconstructiontime.Basedontheheatstorage?releaseproperty
ofphasechangematerial (PCM),thispaperdevelopedaphasechangematerialincorporatedintogravellysoil
(PCM- GS)toimprovetheanti - freezingperformanceinacoldperiod.Theengineeringcharacteristicsandanti -
freezingperformanceofPCM- GSwasanalyzedthroughpermeability ,unconfinedcompression,triaxialcompres
sion ,hotdiskandtemperaturecontroltests.Theresultsindicatethattheunconfinedcompressivestrength,shear
strengthandimpermeabilityofPCM- GSaresignificantlyhigherthanthoseofthegravellysoilwithoutPCM.The
thermalconductivityandspecificheatofPCM- GSdecreasewithPCM content.Accordingtothetemperature
controltest ,afiniteelementsimulationmodelofheattransferwithPCM- GSwasverifiedundercore - wallconstruc
tionconditions.Theanti - freezingperformanceofPCM- GSduringwinterconstructionwasanalyzedunderdifferent
ambientairtemperatures(minimumtemperaturesare- 5℃,- 8℃ and- 10℃,respectively).Thesimulation
resultshowsthatthePCM- GSat6% PCM contentisabletopreventsoilfromfreezingwhentheminimumambient
temperatureis - 5℃.ThecombinationofincreasingtheinitialtemperatureofPCM - GSandcoveringanupperlayer
assuresthecontinuouscore - wallconstructionwithhighefficiencywhenminimum ambienttemperatureis- 10℃.
ComparedwithgravellysoilwithoutPCM,thePCM- GSextendtheconstructiontimeforcore - wallcompactionin
winter ,whichoffersapotentialalternativetoimprovetheanti - freezingperformanceofPCM - GSduringwintercon
struction.
Keywords:corerockfilldam;constructionincoldregion;phasechangematerialandgravelmixedsoil;engi
neeringcharacteristics;anti - freezingandtemperaturecontrol
(责任编辑:李 娜)
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