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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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