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StudyondiscreteelementsimulationofRCClayeredcompactionand
meso - mechanism ofconstruction - inducedinterfaces
LIUDonghai,MAZiru,SUNLongfei
(StateKeyLaboratoryofHydraulicEngineeringIntelligentConstructionandOperation,TianjinUniversity,Tianjin 300350,China)
Abstract:Theuniquelayeredcompactionprocessofalargeworkingareadeterminesthatthequalityofbondingbe
tweenlayersiskeytoensuringtheoperationsafetyofroller - compactedconcrete(RCC)dam.RevealingtheRCC
construction - inducedinterfacesmechanismfromtheperspectiveofconstructioncontrolandadjustingthecompaction
parameterscaneffectivelyensuretheconstructionquality.First ,thecompactionsettlementlaw,compactionde
gree ,andshearstrengthofRCCduringlayeredcompactionprocessweretested,providingabasisfordiscreteele
mentsimulation.Then ,thediscreteelementmodelsofRCCdouble - layercompactionandsheartestwereestab
lishedandverified.Finally ,theaggregateembeddingvaluewhichcharacterizesthejointsbondingqualitywasde
fined ,andthemeso - mechanismofRCCconstruction - inducedinterfaceswasanalyzedfromtheaspectsofporosity,
aggregateembedding, andjointsstressdistributionandshearstrength.Theresultsshow thattheincreaseof
excitingforceandthedecreaseofrollingspeedandliftthicknessarebeneficialtoimprovethejointsbondingquali
ty,andtheliftthicknessisthemostsensitivefactoraffectingthequality.Thisstudyprovidesatheoreticalsupport
forcontrollingthejointsbondingqualityduringRCCconstruction.
Keywords:roller - compactedconcretedam;construction - inducedinterfaces;meso - mechanism;jointsbonding
quality ;compactionparameters;discreteelementsimulation;compactiontest
(责任编辑:韩 昆)
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