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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
                                                                        3
                                                                     4
                  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
                                                                                                  2
                  tionandotherinfrastructureinDedaTownshipupstreamofthelandslide,coveringanareaof0.81~1.02km .The
                  dammedlakemayoverflowwithin7days ,whichrequireshighattention.
                  Keywords:ancientlandslide;resurrectioncharacteristics;extremerainfall;instabilityprobability;riverblockinghazard

                                                                                    (责任编辑:李 娜)

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