三峡库区千将坪滑坡的发生、地质地貌特征、-成因及滑坡判据研究

2417Vol.24No.1720059ChineseJournalofRockMechanicsandEngineeringSept.20052005022420050513(973)(2002CB412702)(KJCX2SWL11)(046)(1977)[e-mail](100029)(2.4107m3)2003713()P642.2A10006915(2005)17314608OCCURRENCEGEOLOGYANDGEOMORPHYCHARACTERISTICSANDORIGINOFQIANJIANGPINGLANDSLIDEINTHREEGORGESRESERVOIRAREAANDSTUDYONANCIENTLANDSLIDECRITERIONLIAOQiu-linLIXiaoSoutingLeeDONGYan-hui(KeyLaboratoryofEngineeringGeomechanicsInstituteofGeologyandGeophysicsChineseAcademyofSciencesBeijing100029China)AbstractQianjiangpinglandslide(2.4×107m3)whichoccurredintheThreeGorgesReservoirareaonJuly132003isoneoftheseriouslandslidedisastersinthisareaafterimpounding.Alsoitcausedaseriouslossoflivesandproperty.Accordingtothetrackingsurveyonthislandslidequiteanumberofinformationaboutthelandslideisobtained.Thispaperfirstlyintroducesthelocationgeologicalbackgroundoccurrenceandtheemergencymonitoringofthelandslideandelucidatesitstypicalgeologicandgeomorphiccharacteristicssuchasitsplaneshapeofdustpanboundarylongitudinaltensilecrackinlandslidebodyandgeologicalstructureandsoon.Secondlycombinedwiththefirst-handdatatheoriginofQianjiangpinglandslideisanalyzedbyutilizingthetheoriesofgeomorphyandengineeringgeologymechanics.TheresultshowsthatthevulnerablegeologicalstructureoflandslidebodyandconcentratedrainfallmainlycausethislandslidewhiletheriseofQingganheRiverandexcavationacceleratetheoccurrencetosomedegree.Finallythemethodsoffieldidentifyingofancient(orold)landslideinreservoirareaarediscussedintermofthegeologicandgeomorphiccharacteristicsofQianjiangpinglandslide.KeywordsslopeengineeringQianjiangpingnewlandslidelandslideoriginlandslidecriterion2417.•3147•1200371300200030m2220m14105735()[1]Cervinara[2][35]4022.1N305806E110362113km3341Fig.1Locationmapforthestudyarea2.2NNE2030406070[6]4(1)(J2q)()(2)(J1t)()(3)(T3j)()(4)(T2b)()233.1200371300200050cm7120800000.5cm140m450m12143000201001020km•3148•20052Fig.2Geologicalofthelandslidehistogram1h321400023200023500030cm2min1300200043Fig.3Photoofsimplefissuremetermonitoring3.2(1)800m300m1000m0.46km245EW1060m40m2.4107m3100m75m4Fig.4GeneralviewofQianjiangpinglandslide12.426m2630m3030.8m30.831.231.242.8m2417.•3149•5Fig.5Terrainandboundaryofthelandslide(2)409m80m330m14026317075m130138NE20m10m1501520m(3)510m30m801001020cm66Fig.6Longitudinaltensilecrackinlandslidebody()30m250m5004003002001001003002000200400600mN•3150•200515m100m20m3.352(1)24m(2)310m(3)410m(4)1035m(5)2050cm25cm77Fig.7Slidingzoneaswellasitsmirrorfaceandscratch(30)()15751cm4(A)190BAABBB15588Fig.8Movingmodelofthelandslide5()NBA2417.•3151•5.1290()()330m195.212d110.5mm6135.8mm10m5.34070m140m()6•3152•2005[79]()()()(7)[10]102[11]7()(References)[1]FiorilloFGuadagnoFMAquinoSetal.TheDecember1999CervinaralandslidesfurtherdebrisflowsinthepyroclasticdepositsofCampania(SouthernItaly)[J].BulletinofEngineeringGeologyandtheEnvironment200160(3)171184.[2]ShangYJYangZFLiLHetal.Asuper-largelandslideinTibetin2000backgroundoccurrencedisasterandorigin[J].Geomorphology200354(3/4)225243.[3]DaiFCLeeCFWangSJ.Analysisofrainstorm-inducedslide-debrisflowsonnaturalterrainofLantauIslandHongKong[J].EngineeringGeology199951279290.[4]GuzzettiFCardinaliMReichenbachP.Landslidestriggeredbythe23thNovember2000rainfalleventintheImperiaProvinceWesternLiguriaItaly[J].EngineeringGeology(tobepublished)[5]SendirHYilmazI.StructuralgeomorphologicalandgeomechanicalaspectsoftheKoyulhisarlandslidesintheNorthAnatolianFaultZone(SivasTurkey)[J].EnvironmentalGeology2002425260.[6].[M].2417.•3153•1990.(BureauofGeologyandMineralResourcesofHubeiProvince.RegionalGeologyofHubeiProvince[M].BeijingGeologicalPublishingHouse1990.[7].[][D].2004.(YanFuzhang.Studyonthemechanismofreservoir-inducedreactivationofancientlandslidesandpredictionofitsdevelopmenttendency[Ph.D.Thesis][D].BeijingGraduateUniversityofChineseAcademyofSciences2004.(inChinese))[8]DengQL.MassrockcreepandlandslidingontheHuangtuposlopeinthereservoirareaoftheThreeGorgesProjectYangtzeRiverChina[J].EngineeringGeology2000586783.[9].[J].200311(4)354359.(XuQiangHuangRunqiuChengQiangongetal.StudyonsoilpropertiesinslidingzoneofXietanlandslideontheThreeGorgesReservoir[J].JournalofEngineeringGeology200311(4)354359.(inChinese))[10].[J].200423(21)37143720.(LiXiaoZhangNianxueLiaoQiulinetal.Analysisofhydrodynamicfieldinfluencedbythecombinationofrainfallandreservoirlevelfluctuation[J].ChineseJournalofRockMechanicsandEngineering200423(21)37143720.(inChinese))[11].102[J].200311(4)390395.(LiaoQiulinLiXiaoLiShoudingetal.Theeffectofwater-rockinteractiononthedevelopmentandevolvementofthelandslide102ontheSichuanTibetHighway[J].JournalofEngineeringGeology200311(4)390395.(inChinese))20058164()