Page 97 - 2022年第53卷第12期
P. 97
Reliabilityanalysismethodofgravitydam basedonprobability - fuzzy - interval
hybridmodelandimprovedbranchandboundmethod
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WEIBowen,ZHANGSheng,YUANDongyang,XUFugang 1
(1.SchoolofInfrastructureEngineering,NanchangUniversity,Nanchang 330031,China;
2.CollegeofWaterConservancyandHydropowerEngineering,HohaiUniversity,Nanjing 210098,China)
Abstract:Usingthetraditionalprobabilitymodeltoevaluatetheservicesafetyofgravitydam needstoclarifythe
probabilitydistributionofparameters,anditisdifficulttoaccuratelymeasuretheservicereliabilityofgravitydams
basedontheconclusionsofnon - probabilityintervalmodel.Therefore ,areliabilityanalysismethodofgravitydam
basedonprobabilityfuzzy - interval - hybridmodelandimprovedbranchandboundmethodisproposed.Basedon
theprototype ,laboratorytestresultsandsafetymonitoringdata,combinedwiththeparametertime - varyingmodel
andintervalinversionanalysismethod,ahybridmodelforreliabilityanalysisofgravitydamisestablished,which
comprehensivelyconsidersrandomvariables,fuzzyvariablesandintervalvariables.Usingtheinformationentropy
methodandKarushKuhnTucker (KKT)optimizationconditiondecouplingthehybridmodel,thereliabilityindex
iscalculatedbythecheckingpointmethodbasedonequivalentnormalizationmethod(JCmethodforshort).The
traditionalbranchandboundmethodisimprovedtosearchthemainfailuremodes ,andtheDitlevsennarrowbound
methodisusedtocalculatethesystemreliability ,soastocomprehensivelyevaluatetheoverallservicesafetyofthe
gravitydam.Examplesshowsthatthemethodcansolvethereliabilityanalysisofgravitydamswithmanyuncertain
factors ,andhasawiderangeofapplication.Thecalculationresultisstillaprobabilityreliabilityindex.Onthe
premiseofconformingtotheoperationlawofthegravitydam,itshowsthattheselecteddamsectionhasthepossi
bilityofslidinginstability ,whichisconsistentwiththeactualservicesituationofthedam.Inaddition,thehybrid
modelcanbeusedforthereliabilityanalysisofotherstructuralprojectsaftersomeimprovementandexpansion.
Keywords:gravitydam;hybridmodel;failuremode;branchandboundmethod;systemreliability
(责任编辑:韩 昆)
(上接第 1475页)
Characteristicsandmechanism ofinhomogeneousporepressureof
corewallinsuper - highrockfilldam
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ZOUDegao ,JIANGQiuting ,LIUJingmao ,JINWei,ZHUXianwen 3
(1.TheStateKeyLaboratoryofCoastalandOffshoreEngineering,DalianUniversityofTechnology,Dalian 116024,China;
2.SchoolofHydraulicEngineering,DalianUniversityofTechnology,Dalian 116024,China;
3.PowerChinaChengduEngineeringCorporationLimited,Chengdu 610072,China)
Abstract:Monitoringdatashowsthattheporepressureofcorewallexhibitsasignificantinhomogeneousdistribu
tionandthemaximumisfargreaterthanthatofotherprojectsduringtheconstructionperiodofLianghekousuper -
highcore -wallrockfilldam.Thephenomenon exceedspreviousknowledge and arousesthe concernsof
engineeringcommunityaboutthesafetyofthecorewallofthedam.Inthispaper ,thedegreeofsaturationSisin
troducedintogeneralizedplasticconstitutivemodelasaninitialmaterialparameter.Toreflectthecouplingeffect
ofporepressureand S,asimplifiedandefficientfluid - solidcouplingmethodunderundrainedconditionsisestab
lishedandproved.Accordingtothemeasureddistributionruleof S,the3Dfluid - solidcouplinganalysisforLi
anghekoudamshowsthattheinhomogeneousdistributionofporepressureisdirectlyrelatedtotherandomnessof
S.Meanwhile,theformationmechanism andinfluenceofthehighporepressurearerevealed.Theresultscan
providetheoreticalsupportandtechnologyforsafetyassessmentofcorewallinsuper - highrockfilldams.
Keywords:super - highrockfilldam;corewall;porepressure;constructionperiod;elastoplasticity
(责任编辑:李 娜)
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