-非连续变形分析方法模拟千将坪滑坡启动与滑坡全过程

257Vol.25No.720067ChineseJournalofRockMechanicsandEngineeringJuly20062006021220060420(50539110)(SCX200321)948(CT200334)(1963)[e-mail]1213214(1.4300102.4300723.4430034.DDACA94002)20037132.04107m3135m240sP642A10006915(2006)07129707NUMERICALSIMULATIONOFSTARTUPANDWHOLEFAILUREPROCESSOFQIANJIANGPINGLANDSLIDEUSINGDISCONTINUOUSDEFORMATIONANALYSISMETHODWUAiqing12DINGXiuli1LIHuizhong3CHENShenghong2SHIGenhua14(1.KeyLaboratoryofGeotechnicalMechanicsandEngineeringoftheMinistryofWaterResourcesYangtzeRiverScientificResearchInstituteWuhanHubei430010China2.CollegeofWaterResourcesandHydropowerWuhanUniversityWuhanHubei430072China3.ThreeGorgesExplorationSurveyResearchInstituteChangjiangWaterResourcesCommissionYichangHubei443003China4.DDACorporationSanFranciscoCA94002USA)AbstractOnJuly132003afoundationrocklandslidewithtotalvolumeofabout2.04×107m3happenedinQianjiangpingontheleftbankofQingganRiverinZiguiCountylocatedintheThreeGorgesReservoirarea.IntensiveattentionhasbeenarousedforthegeologicfeaturesandstartupmechanismofthelandslidebecauseitlocatedintheThreeGorgesReservoirareaandhappenedinthetimenomorethan2weeksafterthestorageoftheThreeGorgesReservoirupto135melevation.Onthebasisoffieldinvestigationonthegeneralgeologicalconditionsanditsmechanicalparametersoftheactuallandslideandwithadvantagesofrealtimevariableemploymentandlargediscontinuousdeformationsimulationinthemethodofdiscontinuousdeformationanalysis(DDA)thestartupcriterionforalandslideusingDDAnumericalmodelinghasbeenstudiedandthenumericalsimulationofthestartupandwholefailureprocessofthelandslidehasbeencarriedoutbyuseofDDA·1298·2006method.ItisshownthatthemainreasonofQianjiangpinglandslideisthereductionofmechanicalparametersofcontrolledslidingsurfacesinthelandslidebodyresultedfromrainfallandriseofreservoirwaterlevel.Thelandslidebelongstothrustloadcausedlandslide.ComparedtotheactualprocesscharacteristicsoftheQiangjiangpinglandslidethemaximumlandslidevelocityandthemaximumslidedistancearequitereasonableandacceptable.ThetotaldurationofthelandslideobtainedbyDDAmodellingisabout40s.Inadditionthemethodsadoptedinthispapersupplyanewapproachforstabilitystudyoflandslideorothergeotechnicalengineering.Keywordsslopeengineeringdiscontinuousdeformationanalysis(DDA)numericalsimulationQianjiangpinglandslidestartupoflandslidewholefailureprocessoflandslidethrustloadcausedlandslide120037132.04×107m330m10135m2[13](DEM)(FLAC)[48](discontinuousdeformationanalysisDDA)DDA22.1NE40()400500m9395m91m15202530344175400m80305m800mNE(J12n)(Qdl+el)(Qal)(J12n)1301533331521SN810m270700.50.8m2EW35m360701m2()12257.•1299•123456789101Fig.1Geologicsectionoflandslide123456782(m)Fig.2Topographyandgeologicconditionsoflandslide(unitm)2.21518d2003627350m280m36cm7410cm10cm14h140m0.5cm182m35cm7130202.394.7m170m600m350405m380m1150m6.8105m230m2.04107m3()()()()()313016m/s150m2.4106m31/91/82325m3DDA3.1DDADDA/m/m/m·1300·20063Fig.3SpatialmorphologyofQianjiangpinglandslide[914](1)(2)(3)()(4)3.2DDA44DDAFig.4ElementmeshofDDAmodel39513022564745mEW710m3.331135m111135m3.4f=0.25c=0.05MPaf=0.370.40c=0.0230.09MPa2(1)(2)1AB1Table1MechanicalparametersoflandslideE/GPaνϕ/()c/MPaϕ/()c/MPaA0.51.00.3518230.030.0618230.020.05B0.51.00.3518200.030.0512150.020.032.00.25DDA0.01s43#53#394#257.•1301•44.1DDAt3443#53#394#4.2DDA3(1)11A5(43#53#)(394#)(2)2135m1A135m656(3)3135m1B77(OA)(43#53#)394#OA394#33(a)(b)51Fig.5Calculationresultsincase1(a)(b)62Fig.6Calculationresultsincase257012345678051015/s/m43#53#394#0.50.00.51.01.52.02.50246810121416/s/(m·s1)43#53#394#0.50.50.51.52.53.54.55.56.5024681012/s/m43#53#394#5432101234024681012/s/(m·s1)394#43#53#·1302·2006(a)(b)73Fig.7Calculationresultsincase35DDA389(1)8OA(2)8Fig.8Slidingvelocityversustimeduringwholeprocessoflandslide9Fig.9Deformationpatternofblocksystem8AB9(a)5m/s(3)8BC9(b)40s105m6DDADDA0.00.51.01.52.02.53.03.5024681012/s/(m·s1)43#53#394#OA149141924024681012/s/m43#53#394#OA(a)15000(15s)(b)50000(50s)0.00.51.01.52.02.53.03.54.04.55.001020304050/s/(m·s1)43#53#394#OABCAB257.•1303•DDA40s(References)[1].[J].200435(9)2426.(ZhangYemingLiuGuangrunChangHongetal.AnalysisofQianjiangpinglandslidestructureintheThreeGorgesReservoirareaandrevelation[J].YangtzeRiver200435(9)2426.(inChinese))[2].[J].200516(3)411.(WangZhihuaYangRihong.TheactivitycharacteristicsandmovementstyleofQianjiangpinglandslideintheThreeGorgesReservoirregion[J].TheChineseJournalofGeologicalHazardandControl200516(3)411.(inChinese))[3].[J].200524(17)31463153.(LiaoQiulinLiXiaoLeeSoutingetal.OccurrencegeologyandgeomorphologycharacteristicsandoriginofQianjiangpinglandslideintheThreeGorgesReservoirareaandstudyonancientlandslidecriterion[J].ChineseJournalofRockMechanicsandEngineering200524(17)31463153.(inChinese))[4].[J].199516(2)114.(WangYongjiaXingJibo.DiscreteelementmethodandLagrangianelementmethodandtheirapplicationstogeomechanics[J].RockandSoilMechanics199516(2)114.(inChinese))[5].[J].199310(1)7276.(WuAiqingRenFang.Discreteelementanalysisofthedeformationandmanneroffailureofslopeandunstablecliff[J].JournalofYangtzeRiverScientificRe