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Numericalsimulationonanti - freezingandtemperaturecontrolofphasechange
materialinconstructionwithloose - coveringlayer
LIUDonghai,ZHENGHan,MAZiru,CHENHui
(StateKeyLaboratoryofHydraulicEngineeringIntelligentConstructionandOperation,TianjinUniversity,Tianjin 300350,China)
Abstract:Duringtheconstructionofembankmentandsubgradeundernegativetemperatureinwinter,thecom
pactionperformanceofthematerialswillbereducedduetoshort - termfreezingorfreezing - thaw ,whichwillleadto
frostheave,thawcollapse,crackingandotherdiseases.Theprocessofconventionalcoveringinsulationmeasure
iscomplex,whichmakesitdifficulttoachievecontinuousconstructioninnegativetemperature,andlikelytoex
tendtheconstructionperiod.Phasechangematerials(PCM)providepossibilitytoimprovethefrostresistanceand
ensuretheconstructiontimeinwinter.However ,thehighcontentofPCM affectsthemechanicalpropertiesofsoil.
Therefore,thepaperproposedacombinedanti - freezingandtemperaturecontrolmeasureofmixingPCM andloose -
covering.Usingtheoriginalupperloose - coveringprocessintheconstruction ,reducedthePCM contentandthe
constructioninterferenceasmuchaspossible,andsolvedthesurfaceanti - freezingproblem ofthesoilduringthe
negativetemperatureconstructionexposureperiod.First,afiniteelementnumericalmodelofconstructionphase
changeheattransferconsideringtheupperloose - coveringwasestablished,andthevalidityofthemodelwasveri
fied.Then ,theinfluenceofdifferentloose - coveringthicknessandPCM contentonthetemperaturecontroleffect
ofPCM inwinterconstructionwasquantitativelyanalyzed ,andtheestimationmethodofeffectiveconstructiontime
ofPCM wasproposed.Finally ,thesuggestionofanti - freezingandtemperaturecontrolmeasureswasgiven.The
2% PCM contentand9.6cmloose - coveringthicknesscanmeettherequirementsoftemperaturecontrol.Thisstudy
providesanewtechnicalwaytosolvetheanti - freezingandtemperaturecontrolproblemduringtheconstructionin
coldregionsinwinter.
Keywords:phasechangematerial - incorporatedclay(PCM - clay);anti - freezingandtemperaturecontrol;loose -
covering ;phasechangeheattransfer;numericalsimulation
(责任编辑:王 婧)
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