Page 130 - 2024年第55卷第1期
P. 130
[19] SONGC,FRANCISTL,WEIG.Adefinitionandevaluationprocedureofgeneralizedstressintensityfactorsat
cracksandmulti - materialwedges [J].EngineeringFractureMechanics,2010,77:2316 - 2336.
[20] SHIM,ZHONGH,OOIET,etal.Modellingofcrackpropagationofgravitydamsbyscaledboundarypolygons
andcohesivecrackmodel[J].InternationalJournalofFracture,2013,183(1):29 - 48.
[21] 钟红,暴艳利,林皋.基于多边形比例边界有限元的重力坝裂缝扩展过程模拟[J].水利学报,2014,45
(S1):30 - 37.
[22] LIYT,ZHONGH,PANGL,etal.Influenceofthewaterpressuredistributionalongcrackfacesonseismicfrac
turemodelingofadam- reservoir - foundationsystem[J].EngineeringAnalysiswithBoundaryElements,2019,
101(4):252 - 269.
[23] OOIET,SHIM,SONGC,etal.Dynamiccrackpropagationsimulationwithscaledboundarypolygonelements
andautomaticremeshingtechnique [J].EngineeringFractureMechanics,2013,106:1 - 21.
[24] FREUNDLB.DynamicFractureMechanics[M].Berlin:CambridgeUniversityPress,1998.
[25] ERDOGANF,SIH G.Onthecrackextensioninplatesunderplaneloadingandtransverseshear[J].Journalof
BasicEngineering ,1963,85:519 - 525.
[26] HALLJF.Thedynamicandearthquakebehaviourofconcretedams:reviewofexperimentalbehaviourandobser
vationalevidence [J].SoilDynamics& EarthquakeEngineering,1988,7(2):58 - 121.
[27] HARIRI - ARDEBILIM A,SEYED - KOLBADISM,KIANOUSHM R.FEM- basedparametricanalysisofatypi
calgravitydam consideringinputexcitationmechanism[J].SoilDynamicsandEarthquakeEngineering,2016,
84:22 - 43.
Dynamicfracturemodellingofconcretegravitydamsbypolygon
ScaledBoundaryFiniteElementMethodunderearthquake
1
2
1
2
JIANGXinxin,ZHONGHong,LIYuntu,NIUJingtai,
1
DENGZhiping,HUANGHongyuan 1
(1.NanchangInstituteofTechnology,Nanchang 330099,China;
2.StateKeyLaboratoryofSimulationandRegulationofWaterCycleinRiverBasin,ChinaInstituteof
WaterResourcesandHydropowerResearch ,Beijing 100038,China)
Abstract:Toinvestigatetheseismicfracturemechanism ofgravitydams,afullyautomateddynamicfracture
modelforgravitydamsisproposedbasedonlinearelasticfracturemechanicsandthePolygonScaledBoundaryFi
niteElementMethod(PolygonSBFEM).ThismodelinheritstheadvantagesofSBFEM intermsofhighaccuracy
andefficiencyinfractureanalysis.Itachievesthedeterminationofdynamicfractureparametersbyproposingatime -
domainmethodofgeneralizeddynamicstressintensityfactorsusingpolygonalscaledboundaryelements.Thenu
mericalmodelevaluatesthecrackstabilitybasedoncrackpropagationcriteria.Forthecracksreachingcritical
states ,thelocalremeshingalgorithmforpolygonsareutilizedtosimulatecrackpropagation.Additionally,ady
namiccontactsimulationalgorithmconsideringcrackopeningandclosurebehaviorisdevelopedtoefficientlyauto
matethecrackpropagation.TakingtheKoynagravitydamasacasestudy ,thecrackingprocessofthedamissim
ulated ,withtheinteractionbetweenthedamandreservoirunderearthquakebeingconsidered,andthecrackpro
fileofKoynadamispredictedandvalidated.Furthermore ,theinfluenceofparameterssuchasmeshdensityand
crackpropagationstepsizeinthemodelisinvestigated.Itisshownthatacoarsemeshcanresultinsatisfactoryre
sults ,andthreecrackpropagationstepsizesleadtoclosecrackprofilesoftheKoynadam.However,asthestep
sizeincreases ,thedamismorepronetoearlyfailure.Theresearchfindingspresentedaboveprovidepowerfultech
nicalmeansforthedynamicfractureanalysisofpracticalconcretedams.
Keywords:scaledboundaryfiniteelementmethod;dynamicfracturemodelling;polygonelement;concretegrav
itydam ;crackpropagation;localremeshing
(责任编辑:韩 昆)
— 1 2 5 —