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                              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)


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