地下水滲流作用下雙管凍結(jié)試驗(yàn)及凍結(jié)管優(yōu)化布置摘要

本文介紹了地下水滲流作用下雙管凍結(jié)試驗(yàn)及凍結(jié)管優(yōu)化布置的研究。首先根據(jù)豐水期與枯水期不同情況下地下水位的變化，設(shè)計(jì)出不同的凍結(jié)管布置方案，并對(duì)不同方案加以對(duì)比分析。接著，對(duì)兩條管道進(jìn)行了雙管同步凍結(jié)試驗(yàn)，通過(guò)實(shí)驗(yàn)得到了溫度場(chǎng)和應(yīng)力場(chǎng)數(shù)據(jù)。最后，利用FLAC3D有限元軟件進(jìn)行數(shù)值模擬，對(duì)實(shí)驗(yàn)結(jié)果得到了驗(yàn)證。實(shí)驗(yàn)和模擬結(jié)果表明，在地下水滲流作用下，優(yōu)化的雙管凍結(jié)試驗(yàn)布置方案可以有效地提高管道的支護(hù)力，降低凍皮，保證安全施工。

關(guān)鍵詞：雙管凍結(jié)試驗(yàn)；地下水滲流；溫度場(chǎng)；應(yīng)力場(chǎng)；優(yōu)化布置

Abstract

Thispaperintroducesthestudyofdouble-pipefreezingtestandoptimizedpipearrangementundertheeffectsofgroundwaterseepage.Firstly,accordingtothedifferentwaterlevelchangesduringthefloodseasonanddryseason,differentfreezingpipelayoutschemesweredesignedandcompared.Then,twopipelineswerefrozensynchronouslyinthedouble-pipefreezingtest.Thetemperaturefieldandstressfielddatawereobtainedthroughexperiments.Finally,theFLAC3Dfiniteelementsoftwarewasusedfornumericalsimulationtoverifytheexperimentalresults.Theexperimentalandsimulationresultsshowthat,undertheeffectsofgroundwaterseepage,theoptimizeddouble-pipefreezingtestarrangementcaneffectivelyimprovethesupportforceofthepipeline,reducethefrozenlayer,andensuresafeconstruction.

Keywords:double-pipefreezingtest;groundwaterseepage;temperaturefield;stressfield;optimizedarrangemenInrecentyears,theconstructionofundergroundpipelineshasfacednumerouschallengesduetogeologicalandgeotechnicalissues,whichcancausesoildeformation,collapse,andinstability.Therefore,itisimportanttoensurethestabilityandsafetyofundergroundpipelinesduringconstruction.Thedouble-pipefreezingtestisawidelyusedmethodforpipelinesupportandstabilization.However,theeffectsofgroundwaterseepageonthefreezingprocessandthestabilityofpipelineshavenotbeenfullyinvestigated.

Toaddressthisissue,thisstudyproposedanoptimizeddouble-pipefreezingtestarrangementtoimprovethesupportforceofthepipelineandensuresafeconstructionundertheeffectsofgroundwaterseepage.Firstly,alaboratoryexperimentwasconductedtoinvestigatethetemperatureandstressfieldsofthefreezingprocess.Theresultsshowedthatthetemperaturefieldwasaffectedbythegroundwaterseepage,andthestressfieldexhibitedanunevendistributionunderdifferentseepageconditions.

Secondly,anumericalsimulationwasconductedusingFLAC3Dfiniteelementsoftwaretoverifytheexperimentalresults.Thesimulationresultsshowedthattheoptimizeddouble-pipefreezingtestarrangementeffectivelyimprovedthesupportforceofthepipeline,reducedthefrozenlayer,andensuredsafeconstruction.

Insummary,theproposedoptimizeddouble-pipefreezingtestarrangementissuitableforensuringthestabilityandsafetyofundergroundpipelinesduringconstructionundertheeffectsofgroundwaterseepage.ThefindingsofthisstudyprovideimportantguidanceforthedesignandconstructionofundergroundpipelinesMoreover,thisstudyprovidesasignificantcontributiontothefieldofcivilandconstructionengineering,particularlyinundergroundpipelinedesignandconstruction.Thesefindingscanbeextendedtovariousotherapplications,suchasoilandgaspipelines,sewagepipelines,andwatersupplypipelines,tonameafew.Byadoptingthisoptimizeddouble-pipefreezingtestarrangement,engineersandcontractorscanfacilitatebetterpipelinesupport,minimizeconstructionrisks,andreducedowntimeduringconstruction.

Itisworthmentioningthattheproposedoptimizeddouble-pipefreezingtestarrangementisacost-effectivesolutiontoensurepipelinestabilityandsafetyduringconstruction.Thismethoddoesnotrequireanyexpensiveequipmentorextensivefieldwork.Therefore,itcanbeadoptedinpipelineconstructionprojectsofdifferentscalesandforvariousapplications,providingareliableandpracticalmethodologyforpipelineconstruction.

Inconclusion,theoptimizeddouble-pipefreezingtestarrangementproposedinthisstudyeffectivelyimprovespipelinesupportandreducesthefrozenlayerduringconstruction,ensuringpipelinestabilityandsafetyundertheeffectsofgroundwaterseepage.Thefindingsreportedinthisstudycanguidethedesignandconstructionofundergroundpipelinesandprovideacost-effectivesolutionforpipelineconstruction.Theresultsofthisresearchcanalsohelptheconstructionindustrytominimizeconstructionrisks,reducedowntime,andensuresafeandreliablepipelineoperationOverall,thefindingsofthisstudydemonstratethepotentialbenefitsofusinggeosyntheticclayliners(GCLs)asabarriersystemforburiedpipelines.GCLshavebeenshowntoeffectivelyreducethehydraulicconductivityofsoil,therebyminimizingthepotentialforgroundwaterseepageintopipelines.Inaddition,theuseofGCLscanhelptoreducetheamountofconstructionmaterialsneededforpipelineconstruction,whichcanleadtosignificantcostsavings.

However,itisimportanttonotethattheeffectivenessofGCLsasabarriersystemdependsonseveralfactors,includingthetypeofsoil,thedepthofburial,andthelocationofthepipeline.Therefore,carefulconsiderationofthesefactorsisnecessarybeforedecidingtouseGCLsasabarriersystem.

Furthermore,itisimportanttostresstheimportanceofproperconstructiontechniquesforensuringpipelinestabilityandsafety.Thisincludesproperinstallationofsupportstructuresandtheuseofappropriateconstructionmaterials.Additionally,regularmaintenanceandmonitoringofpipelinesisnecessarytoensurecontinuedsafeoperation.

Inconclusion,theuseofgeosyntheticclaylinersasabarriersystemforburiedpipelineshasthepotentialtoprovidesignificantbenefitsintermsofreducinggroundwaterseepageandminimizingconstructioncosts.However,properconsiderationofsite-specificfactorsandimplementationofappropriateconstructionandmainten