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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