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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FGHIJ:TV698.2 3;TU433 KLMNO:A KPQJ:1672643X(2025)02013410
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.Basedonpseudostaticmethod ,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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