Page 138 - 《水资源与水工程学报》2025年第2期
P. 138

!36 "!2 #                         & ' ( ) & * + , -                               Vol.36No.2
               2025 $ 4 %               JournalofWaterResources&WaterEngineering                 Apr.,2025

            DOI:10.11705/j.issn.1672-643X.2025.02.16


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                       Unitfailureprobabilityofearth-rockdam underearthquake

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                              LIZe,LUZhiming,ZHANGXiaoyan,PENGPu,GUOXing
                (1.FacultyofCivilEngineeringandMechanics,KunmingUniversityofScienceandTechnology,Kunming650500,China;
                   2.FacultyofElectricPowerEngineering,KunmingUniversityofScienceandTechnology,Kunming650500,China;
                           3.CollegeofWaterConservancy,YunnanAgriculturalUniversity,Kunming650201,China;
                               4.PowerChinaBeijingEngineeringCorporationLimited,Beijing100024,China)
                 Abstract:Theinstabilityofearth-rockdamsisrelatedtonumerousstochasticparameters;however,
                 conventionalstabilityanalysisoftenoverlooktheimpactsofmultipleparametersonearth-rockdams,
                 suchasreservoirwaterlevel,soilshearstrength,andearthquakes.Tocomprehensivelyanalyzethefail
                 ureprobabilityanddamagemodesofearth-rockdams ,acasestudyofthedaminapumpedstoragehy
                 dropowerstationwasconducted.Basedonpseudostaticmethod ,plasticlimitanalysis,finiteelement
                 discretizationconcepts,stochasticprogrammingtheory,andMonteCarlosimulation,weproposedanovel
                 algorithmforthereliabilityanalysisofearth-rockdams,consideringthevariabilityofsoilshearstrength
                 parameters.Then,thefailureprobabilitiesofdifferentsectionsofthedamwerecalculatedbasedonthe
                 unitfailureprobabilitytheorytoassessthereliabilityofthewholedam.Theresultsshowthataftersup
                 portingthedownstream slopeofthedam ,thefailureprobabilityundernormalwaterlevelandseismic
                 conditionwerereducedby1.90% and17.56%,respectively,indicatingthatthesupportingpilessus
                 tainedthereinforcementeffectunderseismicconditions.Comparedwiththeconventionalmethods(finite
                 elementmethodandBishop’smethod),thecalculationefficiencyoftheproposedalgorithm wasin
                 creasedby98.31%,withamereaveragerelativeerrorof3.32% forthesafetyfactor.Thissuggeststhat
                 thealgorithmcanaccuratelyandefficientlypredictthefailureprobabilityandfailurezonesofearth-rock
                 dams,providingareliabletoolfortheengineeringdesignandsafetyassessment.

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