水在千将坪滑坡中的作用机理-文宝萍

文宝萍1,申　健1,谭建民2(1.中国地质大学(北京)水资源与环境学院,北京　100083;2.中国地质调查局宜昌地质矿产研究所,宜昌　443003):,。,,,,。,,,、,、。,,。:;;;:P642.22　　　　:A　　　　:1000-3665(2008)03-0012-07:2008-02-15;:2008-03-04:(40472135):(1962-),,,,。E-mail:[e-mail]1　20037131,2000×104m3,5min,200m。14、10。,43,2003621～711,162.7mm,。,[1～11]。[6],,15m,110m,,。、[8],,,,。[9],。,、、,,。,、、、、。,,。,,。,,、、,,、。2　,,400m。,。,80m。1150m,200～400m,600m。(1)。,100～110m(1、2)。·12·　　　　　　20083　DOI:10.16030/j.cnki.issn.1000-3665.2008.03.0161　Fig.1　PlanoftheQianjiangpinglandslide1—;2—;3—;4—;5—;6—2.1　、、—(J1-2n)。、、5～15m,,、。20～45m,、。,,。16.05～22.57kNm3,17.58kNm3[1]。2.2　、,2～3。,()()(2)。,,135°∠32～15°,,。5～10cm,、,,　　2　Fig.2　CrosssectionthroughtheQianjiangpinglandslide1—+;2—;3—;4—;5—;6—;7—22%～39%,20%～35%。。,、[1]。,。,,—,100～120m。。,、,[1,8],,,。X,,、。,[1]。·13·　20083　　　　　　1。1,75%。,,,[1]。1　Table1　ShearstrengthparametersoftheQianjiangpinglandslide'sslipzonesC(kPa)φ(°)C(kPa)φ(°)72.5113.5411416.66112.820.8150033.13　,,GEO-SLOPEJanbu,、,、,,,。[12],。S:S=(η1η2)×100%(1),η1=ΔFs×100%Fs0η2=ΔX×100%(Xmax-Xmin):η1———;η2———;ΔX———X;Xmax、Xmin———X、;Fs0———;ΔFs———ΔX。XE:E=ΔFsmax,x×100%∑ΔFsmax,x(2):ΔFsmax,x———X;Fsmin———,。3.1　1—1′,,2。3.2　,,。,—,—,。、—,[1]。,、。,,,。8,,,。,,,。,2003621～711,162.7mm。,。95m135m。、,。、,,。,135m,,:、、0,、,。、,·14·　　　　　　20083　,135m、、、135m,72。,(、);,。,1～4,5～7。2　Table2　ScenariosdesignedforlandslidestabilityanalysisXX1X117.58～23.58kNm32X2114～72.51kPa3X316.66～13.54°4X40～16.3cm5X51500～112kPa6X633.1～20.8°7X7＊0～40m　　＊,2,。4　Fs=2.43。,、,。,。、,。4.1　(3、4、3),、、、、,。100m,。,,。,,,,。3　、Fig.3　Correlationamongthelandslide'sfactorofsafety,unitofweightofthelandslidematerials,andcohesionandinternalfrictionangleofthelandslide'smainslipzone4　、()Fig.4　Correlationamongthelandslide'sfactorofsafety,groundwaterlevelabovethelandslide'smainslipzoneandupliftwaterpressurefromthereservior'swaterlevel·15·　20083　　　　　　3　Table3　Reductionofthelandslide'sfactorofsafetywithunitdecreaseofthelandslide'sparameters(kNm3)0.046(kPa)0.004(°)0.05(kPa)3×10-4(°)0.01(cm)2.9×10-4(m)0.009　　,。5。,。,,、,、,,。,,(5)。,,。,,(27.8%),(+)38.1%。(23.3%)、(+)(20.1%)、(18.3%),、(0.3%)。,,。、。,,,。,,。,,,;。5　、Fig.5　Correlationamongtheratiovariationoflandslide'sfactorsofsafetyanditsmaximumvalue,influencefactorsofthelandslide'sparameters4.2　,1～4、5～7、。,、、,,,Fs1,2。,2.430.95。,。,、。,、·16·　　　　　　20083　38.7%,、61.3%,。。、,。,,。95m135m,。,,。、。,。5　(1)。,。(2),、,。,,,、。(3)。,,。:[1]　.[R].:,2007.[2]　,,,.、、[J].,2005,24(17):3146-3153.[3]　,.[J].,2005,16(3):5-11.[4]　,,,.[J].,2006(4):57-59.[5]　,,,.[J].,2004,52(9):24-26.[6]　,,.[J].,2005,26(5):668-703.[7]　,,.[J].,2006,37(7):12-20.[8]　,.[J].,2007,34(3):51-54.[9]　,,.[J].,2007,28(7):1459-1464.[10]　WangFa-Wu,ZhangYe-Ming,HuoZhi-Tao,etal.TheJuly14,2003Qianjiangpinglandslide,ThreeGorgesReservoir,China[J].Landslides,2004,1(2):157-162.[11]　DaiFC,DengJH,ThamLG,etal.AlargelandslideinZiguiCounty,ThreeGorgesarea[J].CanadianGeotech.J.2004,41(6):1233-1240.[12]　.[M].:,2001:193-199.·17·　20083　　　　　　TheinfluenceofwaterontheoccurrenceofQianjiangpinglandslideWENBao-ping1,SHENJian1,TANJian-min2(1.ChianUniversityofGeosciences(Beijing),Beijing　100083,China;2.YichangInstituteofGeologyandMineralResources,ChinaGeologicalSurvey,Yichang　443003,China)Abstract:QianjiangpinglandslidewasthefirstcatastrophiclandslideoccurredinthereservoirareaoftheThreeGorgesdamafteritsimpoundment.Followinganalyzingcharacteristicsofthelandslide,variationofitsfactorofsafety(Fs)undertheinfluenceofbothriseofreservoirwaterlevelanddurativerainfallwasinvestigatedinthispaperusingsensitiveanalysiswithaconsiderationofaserieseffectsofwateronthelandslide,suchas:weakeningofshearstrengthofthelandslide'sslipzone,increasingunitweightofthelandslidematerials,imposingaupliftwaterpressureonthelandslide,andrisinggroundwatertable.Itwasfoundamongtheseeffects,weakeningofshearstrengthofthelowersectionofthelandslide'sslipzone,whichdevelopedcrossingbeddingplanesofmudstone,hadthestrongestinfluenceonthelandslide'sstability,followedbythoseofupliftwaterpressure,weakeningofshearstrengthoftheslipzone'suppersectionalongthebeddingplaneofshale,increasingofunitweightoflandslide'smaterials,whereasrisingofgroundwatertablehadlittleinfluenceonthelandslide.ResultsofthisstudyshowedthatoccurrenceofQianjiangpinglandslidewasaconsequenceofcombinedinfluenceofimpoundmentofThreeGorges'damanddurativerainfall.However,itseemsthatinfluenceoftheformerwasmuchgreaterthatthelatter.Keywords:Qianjiangpinglandslide;riseofreservoirwaterlevel;rainfall;sensitiveanalysis:张明霞(上接第11页)AnalysisonengineeringrupturingpossibilityofthefaultF201anditseffectsontheDaliushudamsiteareaoftheYellowRiverMARun-yong,PENGJian-bing(KeyLaboratoryofEducationalMinistryofWesternGeologyResourceandGeologyEngineering,DepartmentofGeologicalEngineering,Chang'anUniversity,Xi'an　710054,China)Abstract:TheDaliushudamsiteintheHeishanxiaGorgeoftheYellowRiverislocatedinthemiddleofZhongwei-Tongxinoverthrustnappefracturezone,whichis1.5kmapartfromtheseismogenicfaultF201.Inthedamsitearea,thefracturezoneiscomposedofmanyfaults,andthefaultscanbedividedintomainfaultsandbranchfaults,whichhaveacloserelationwiththefaultF201.Theresultsofstatistici