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                               Studyonseismicsafetyevaluationindexofthehigharchdam:
                                            AcasestudyofBaihetanArchDam
                                                              1,2
                                                                          1
                                              1
                                      QINLijun,CHENJianyun ,XUQiang,LIJing         1
                              (1.SeismicInstituteofEngineering,DalianUniversityofTechnology,Dalian 116024,China;
                      2.StateKeyLaboratoryofCoastalandOffshoreEngineering,DalianUniversityofTechnology,Dalian 116024,China)

                  Abstract:Inordertostudythelocalstabilityofthemiddleandupperpartofthecrowncantileverunderearthquake
                  andputforwardreasonablelocalseismicsafetyevaluationindexes ,thispapertakesBaihetanArchDam asan
                  exampletoestablishathree - dimensionalfiniteelementmodelfornumericalsimulationcalculation.Takingthe
                  middleandupperpartofthecrowncantileverastheresearchobject ,andtakingtheanti - slidingsafetyfactorand
                  anti - slidingsafetyfactordurationbasedonthemonolithasthelocalsafetyevaluationindexes , thevariation
                  regularswiththepeakgroundacceleration(PGA)anddistributionregularsalongdamelevationofthetwoindexes
                  arestudied.Basedonthestatisticalresultsoftheproposedindexes,theweakpositioninthemiddleandupperpart
                  ofthecrowncantileverisdetermined.TheresultsshowthatwiththeincreaseofPGA,theheightofweakposition
                  inthecrowncantileverdecreasesgradually.WhenPGAislessthan0.8gandgreaterthanorequalto0.8g,the
                  weaksurfaceofthemiddleandupperpartofthecrowncantileveris0.79 - 0.83timesofdamheightand0.76 - 0.79
                  timesofdamheight ,respectively.Theresultsobtainedinthispaperaresimilartotheshakingtabletestresultsof
                  higharchdams ,andtheevaluationeffectoftheproposedindexesisgoodwhenappliedtothemiddleandupper
                  partofthecrowncantilever,whichcanprovidereferenceforlocatingtheweakpositionofhigharchdamanddam
                  safetymonitoringunderearthquake.
                  Keywords:higharchdam;crowncantilever;numericalsimulation;seismicsafetyevaluation

                                                                                    (责任编辑:韩 昆)

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