Page 26 - 2023年第54卷第12期
P. 26
[25] 姚可夫,田始光,漆一宁,等.高 海 拔 区 特 征 环 境 驱 动 下 混 凝 土 坝 服 役 性 能 研 究 进 展 [J].水 利 学 报,
2023,54(6):717 - 728.
[26] 林鹏,李明,刘科,等.低热水泥碾压混凝土坝适应性智能通水策略研究[J].水利学报,2022,53(9):
1028 - 1038.
[27] 林鹏,宁泽宇,李明,等.特高拱坝通水冷却管网智能联控原型试验研究[J].水利学报,2021,52(7):
819 - 828.
Temperaturemonitoringandequivalenthomogeneitysimulationofintegrally - poured
rock - filledconcretearchdam duringconstructionperiod
3
1
2
4
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
(责任编辑:韩 昆)
— 1 4 4 —
1