地下水滲流作用下人工凍結(jié)砂層溫度場演化規(guī)律研究

地下水滲流作用下人工凍結(jié)砂層溫度場演化規(guī)律研究地下水滲流作用下人工凍結(jié)砂層溫度場演化規(guī)律研究

摘要：

人工凍結(jié)技術是一種常用的土木工程處理手段，其中地下水滲流對砂層的溫度場演化有著重要的影響。本文采用數(shù)值模擬方法，對地下水滲流作用下人工凍結(jié)砂層溫度場演化規(guī)律進行研究。首先，建立了考慮地下水滲流的砂層凍結(jié)模型，并對該模型進行分析。接著，采用有限元方法，對地下水滲流對凍結(jié)砂層溫度場演化的影響進行模擬。通過對模擬結(jié)果的分析，發(fā)現(xiàn)地下水滲流會對砂層溫度場的演化產(chǎn)生顯著的影響。在地下水滲流作用下，凍土帶寬度明顯增加，凍結(jié)溫度降低，因此需要在實際工程中加強排水措施，以降低地下水對人工凍結(jié)砂層溫度場演化的影響。

關鍵詞：地下水滲流，人工凍結(jié)，砂層，溫度場演化，數(shù)值模擬

Abstract:

Artificialfreezingtechnologyisacommonlyusedmethodincivilengineering.Groundwaterseepagehasanimportantinfluenceonthetemperaturefieldevolutionofsandylayerduringartificialfreezing.Inthisstudy,numericalsimulationmethodwasemployedtoinvestigatetheevolutionlawoftemperaturefieldunderartificialfreezinginsandylayerwithgroundwaterseepage.Firstly,thefrozensandlayermodelconsideringgroundwaterseepagewasestablishedandanalyzed.Then,finiteelementmethodwasusedtosimulatetheinfluenceofgroundwaterseepageontheevolutionoffrozensandlayertemperaturefield.Theanalysisofsimulationresultsshowedthatgroundwaterseepagehadasignificantimpactontheevolutionoftemperaturefieldinsandylayer.Undertheactionofgroundwaterseepage,thewidthoffrozensoilzoneincreasedobviouslyandthefreezingtemperaturedecreased,thusdrainagemeasuresshouldbestrengthenedinpracticalengineeringtoreducetheinfluenceofgroundwaterontheevolutionoftemperaturefieldinartificialfrozensandylayer.

Keywords:Groundwaterseepage,artificialfreezing,sandylayer,evolutionoftemperaturefield,numericalsimulationInmanypracticalengineeringapplications,suchasfoundationconstructionandmining,artificialfreezingtechnologyisoftenusedtocreateastableworkingenvironment.However,theexistenceofgroundwaterinsandylayerscansignificantlyaffecttheevolutionofthetemperaturefieldduringartificialfreezing.

Throughnumericalsimulation,itwasfoundthatgroundwaterseepagecouldsignificantlyincreasethewidthofthefrozensoilzoneandlowerthefreezingtemperature.Thisisbecausethepresenceofwaterinthesandylayercanactasaheatsink,causingmoreheattobelostduringthefreezingprocess.

Tomitigatetheimpactofgroundwaterseepage,itisnecessarytostrengthendrainagemeasuresduringartificialfreezing.Byreducingtheamountofwaterinthesandylayer,theinfluenceofgroundwateronthetemperaturefieldcanbeminimized,leadingtomorestableandefficientartificialfreezing.

Inconclusion,groundwaterseepagehasasignificantimpactontheevolutionoftemperaturefieldinartificialfrozensandylayers.Inpracticalengineeringapplications,propermeasuresmustbetakentoreducetheinfluenceofgroundwaterandoptimizethefreezingprocessAdditionally,itisimportanttoconsidertheimpactoffreezingonthemechanicalpropertiesofthesandylayer.Freezingcancausechangesintheporosity,permeability,andshearstrengthofthesoil,whichcaninturnaffectthestabilityandperformanceofstructuresbuiltonfrozenground.

Tobetterunderstandthesechanges,laboratoryandfieldtestsshouldbeconductedtomeasurethemechanicalpropertiesofthefrozensoil.Inparticular,theshearstrengthofthesoilshouldbecarefullyevaluated,asitplaysacriticalroleinthestabilityofembankments,tunnels,andotherstructures.

Furthermore,itisimportanttomonitortheevolutionofthetemperaturefieldduringthefreezingprocess,asanydeviationsfromtheintendedtemperatureprofilecanhavesignificantconsequences.Temperaturemonitoringcanbeaccomplishedusingthermocouplesorfiberopticsensors,whichcanprovideaccurateandreliablemeasurementsoftemperaturechangesinthesoil.

Finally,itisworthnotingthattheeffectivenessofartificialfreezingcanbeinfluencedbyawiderangeoffactors,includingthepropertiesofthesoil,thegeometryofthefreezingsystem,andtheenvironmentalconditions.Inordertooptimizetheperformanceofartificialfreezing,itisnecessarytocarefullyconsiderallofthesefactorsandtotailorthefreezingprocesstothespecificneedsoftheproject.

Insummary,artificialfreezingisapowerfultechniqueforstabilizingsoilandfacilitatingtheconstructionofundergroundstructuresincoldenvironments.However,carefulplanningandexecutionarerequiredtoensurethatthefreezingprocessiseffectiveandreliable.Bytakingintoaccountthefactorsdiscussedabove,engineerscansuccessfullyleverageartificialfreezingtoachievethedesiredoutcomesinawiderangeofprojectsOneareawhereartificialfreezinghasshownsignificantpromiseisinthecontrolorpreventionofgroundwaterseepage,whichcanposeamajorchallengetoundergroundconstructionprojects.Whengroundwaterpenetratesconstructionsites,itcancompromisethestabilityandintegrityofundergroundstructures,anditcanalsoposearisktoworkers.Artificialfreezingcanbeusedtominimizeoreliminategroundwaterseepagebyloweringthetemperatureofthesurroundingsoil,whichcausesthewatertofreezeandformanimpermeablebarrier.Thistechniquehasbeenusedsuccessfullyintheconstructionoftunnels,reservoirs,andotherundergroundfacilities.

Anotherpotentialapplicationofartificialfreezingisintheremediationofcontaminatedsoils.Frozensoilislesspermeablethanunfrozensoil,whichcansloworpreventthemovementofcontaminantsthroughtheground.Thispropertyoffrozensoilhasbeenusedtoencapsulateandisolatecontaminatedsites,preventingthespreadofpollutantstosurroundingareas.However,thisapproachrequirescarefulplanningandmonitoringtoensurethatthecontaminantsareeffectivelycontainedanddonotthaworescapeovertime.

Inconclusion,artificialfreezingisaversatiletechniquethathasbeenusedsuccessfullyinawiderangeofundergroundconstructionprojects.Byartificiallyloweringthetemperatureofsoil,engineerscancontrolthegroundconditionsandstabilizethesoil,allowingforthesafeandeffectiveconstructionoftunnels,shafts,andotherundergroundfacilitiesincoldenvironments.Whileartificialfreezingisacomplexandchallengingprocess,itoffersuniqueadvantagesforprojectsthatreq