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ResurgentcharacteristicsofZhamaLandslideandriverblockingrisk
analysisintheupperreachesofJinshaRiver
1,3
1,2
1,2
LIJinqiu 1,2,3 ,ZHANGYongshuang ,RENSanshao ,RANLina
(1.Instituteofhydrogeologyandenvironmentalgeology,ChineseAcademyofGeosciences,Shijiazhuang 050061,China;
2.ChinaUniversityofGeosciences(Beijing),Beijing 100083,China;
3.KeyLaboratoryofQuaternaryChronologyandHydro - EnvironmentalEvolution,
ChinaGeologicalSurveye,Shijiazhuang 050061,China)
Abstract:Withthecontinuousintensificationofhumanengineeringactivitiesandthefrequentoccurrenceofex
tremeweather ,theproblemofancientlandslideresurrectionandriverblockingisbecomingmoreandmorepromi
nent ,whichseriouslythreatensthesafetyofmountaintowns.TakingtheZhamaancientlandslideontherightbank
ofBaquRiverintheupperreachesofJinshaRiverasanexample ,usingUAVaerialsurvey,fieldinvestigationand
numericalsimulationanalysis ,thecharacteristicsoftheresurrectionofancientlandslidewereidentified,thede
formationandfailurerangeandinstabilityprobabilityoflandslideunderdifferentrainfallconditionsindifferentre
currenceperiodswereanalyzed ,andtheprocessoflandslidemovement,accumulationrangeandriverblocking
riskunderdifferentworkingconditionsweresimulatedandstudied.Theresultsshowthat :(1)Thelocalreactiva
tionoftheZhamalandslidefrontismainlycharacterizedbyclearsurfacedeformationsignsandprogressivetractive
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failure.ThevolumeofthefrontreactivationareaH 1 isabout185 × 10 m ,withthepossibilityoffurtherdestabili
zingsliding.(2)ThefrontedgeH 1 ofthelandslideisstableinitsnaturalstate,unstableundermonthlyextreme
rainfallconditionsthatoccuronceevery20years,withaprobabilityofinstabilityof87.95%,undermonthlyex
tremerainfallconditionsthatoccuronceevery50yearsand100years ,thefrontedgeH 1 andrearH 2 areoverallun
stable ,withprobabilitiesofinstabilityof58.75% and68.60%.(3)AfterthefrontH 1 isunstable,andtherearH 2
andH 1 arecontinuouslyunstable,themaximumvelocityatthegrooveis9m?sand11m?s,respectively,andthe
slipdistanceisasfaras480m.Abarrierdam withaheightof42~48m isformedinBaquuchannel.(4)The
backwaterformedaftertheblockageofBaqumayinundatetheG318NationalRoad ,residentialbuildingsandsta
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tionandotherinfrastructureinDedaTownshipupstreamofthelandslide,coveringanareaof0.81~1.02km .The
dammedlakemayoverflowwithin7days ,whichrequireshighattention.
Keywords:ancientlandslide;resurrectioncharacteristics;extremerainfall;instabilityprobability;riverblockinghazard
(责任编辑:李 娜)
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