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                    Temperaturemonitoringandequivalenthomogeneitysimulationofintegrally - poured
                                 rock - filledconcretearchdam duringconstructionperiod

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                               XUXiaorong,YUShunyao,JINFeng,LIANGTing,LUOJian             5
                    (1.SchoolofWaterResourcesandHydropowerEngineering,NorthChinaElectricPowerUniversity,Beijing 102206,China;
                                 2.AstronauticsTimesFeihongTechnologyCompanyLimited,Beijing 100094,China;
                           3.StateKeyLaboratoryofHydroscienceandEngineering,TsinghuaUniversity,Beijing 100084,China;
                                4.YalongRiverHydropowerDevelopmentCompanyLimited,Chengdu 610051,China;
                         5.ZunyiSurveyandDesignInstituteofWaterConservancyandHydropowerCo.Ltd,Zunyi 563002,China)

                  Abstract:Theintegrally - pouredarchdamwithouttransversejointsisaninnovativeconstructiontechniquethathas
                  promotedtherapiddevelopmentofrock - filledconcrete(RFC)archdamsinrecentyears.Thedeterminationofthe
                  equivalentparametersforheterogeneousRFCisanurgentissuetobesolvedbeforeconductingtemperaturesimula
                  tionsoffull - scalearchdams.Inthisstudy ,basedontheFengguangarchdamproject,on - sitetemperaturemoni
                  toringexperimentswereconductedduringtheconstructionperiod ,toanalyzethetemperatureevolutionsoftherock
                  fillandself - compactingconcrete(SCC).Additionally,ahomogeneousRFCnumericalmodelwasproposedand
                  simulatedusingthefiniteelementmethod (FEM)tofurtherinvestigatethetemperaturebehaviors.Theexperimental
                  resultsshowedthatthepre - laidrockshavea“thermalinsulationeffect”onthepouredRFCbeneath.Afterpouring
                  ofthefreshSCC,asecondarytemperatureriseoccursinthelower - layerpouredRFC,buttheinfluencedepth
                  doesnotexceedthethicknessofeachlift.Inmildclimateregionsduringwinter,theestimatedplacementtempera
                  tureoftherockfillbodyisabout2.0to4.0℃ higherthanthedailyaverageairtemperature.Combiningtheon - site
                  findingswiththeFEM simulationresults,itwasobservedthattheearly - agetemperatureoftheRFCevolvesfroma
                  non - uniform fieldtoauniform field.OncetheSCCispoured ,itquicklyexchangesheatwiththesurrounding
                  rocks.Afterthehydrationreactionbegins ,therockfillcontinuouslyabsorbsheatfromtheSCC.Approximately48
                  hourslater,itreachesatemperaturepeak,andthetemperaturefieldsofthetwomaterialsapproachahomogeneous
                  distribution.ThehomogeneousRFCmodelwasgeneratedconsideringthestructuresoftheprecastconcreteblock
                  formworksontheupstream anddownstream surfaces ,aswellastheupstream SCCimpermeablelayer.TheFEM
                  numericalsimulationswerethenconductedbyconsideringequivalentparameters ,includingtheequivalentplace
                  menttemperature , weighted thermalconductivity, and equivalentadiabatic temperature rise.This model
                  accuratelysimulatedtheequivalenthomogeneousthermalfieldduringthehydrationandtemperaturedeclineprocess.
                  Overall ,thearchdam, withitsrelativelythinprofileandrapidheatdissipation, exhibitsalow measured
                  hydrationrise (onlyapproximately6℃ inwinter)owingtotheRFCdammingmaterial.Thisstronglysupportsthe
                  feasibilityoftheconstructiontechnologyforintegrally - pouredRFCarchdams.
                  Keywords:rock - filledconcrete;integrally - pouredarchdam;heterogeneousmaterial;thermalconduction;tem
                  peraturefieldsimulation


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