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Reliabilityanalysisofearthrockdam slopeconsideringspatialvariabilityof
soilparametersbasedonK- Lexpansionmethod
4
WANGYuke 1,2,3 ,SHAOLinlan 1,2,3 ,WANYukuai,YUXiang 1,2,3 ,
1,2,3
1,2,3
ZHANGBei ,ZHONGYanhui
(1.SchoolofWaterConservancyandTransportation,ZhengzhouUniversity,Zhengzhou 450001,China;
2.NationalLocalJointEngineeringLaboratoryofMajorInfrastructureTestingandRehabilitationTechnology,
Zhengzhou 450001,China;
3.Provincialandministerialcollaborativeinnovationcenterforundergroundengineeringdisasterpreventionandcontrol,
Zhengzhou 450001,China;
4.SchoolofCivilandHydraulicEngineering,NingxiaUniversity,Yinchuan 750021,China)
Abstract:Inviewofthelimitationsoftraditionalearthrockdamslopestabilityanalysismethodsindealingwiththe
spatialvariabilityofsoilparameters ,areliabilityanalysismethodforearthrockdam slopesbasedonKarhunen -
Loève(K - L)expansionmethodisproposedinthispaper.TheK - LexpansionmethodisintegratedwithLatinhy
percubesamplingtechniqueandCholeskydecompositionmethodtoestablisharandomfieldmodelofdamslopesoil
parameters,forwhichthespatialuncertaintyandstochasticityaretakenintoaccount.Onthisbasis,theMonte
Carlosimulationmethodisusedtoevaluatethereliabilityofthedamslope.Throughthesensitivityanalysisofvaria
tioncoefficient ,autocorrelationdistanceandcorrelationcoefficientofsoilparameters,theeffectsoftheseparame
tersonslopefailureprobability ,safetyfactorandpotentialslipsurfacedistributionarestudied.Theresultsshow
thatthespatialvariabilityofsoilparametersontheearthrockdam slopehasasignificantimpactonthestability.
Thevariationcoefficientofinternalfrictionangle ,verticalautocorrelationdistanceandcorrelationcoefficienthavea
greaterimpactonthedamslopereliability.Whenthecoefficientofvariationofinternalfrictionangleincreasesfrom
0.1to0.4 ,theslopefailureprobabilityofdamslopeincreasesby32.55%.Whentheverticalautocorrelationdis
tanceincreasesfrom1mto4m ,thefailureprobabilityincreasesby2.1%.Whenthecorrelationcoefficientincrea
sesfrom - 0.8to0.5 ,thefailureprobabilityincreasesby3.85%.
Keywords:damslope;reliability;spatialvariability;Karhunen - Loèveexpansionmethod
(责任编辑:李 娜)
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