GEOLOGICALBULLETINOFCHINA28820098Vol.28,No.8Aug.,2009,,。,10×104m3,[1]。,,、、,、、,:2009-05-08;:2009-05-22:《》(:1212010814015):(1968-),,,,。E-mail:xq@cdut.edu.cn——,XUQiang,CHENWei,610059NationalSpecialtyLaboratoryofGeohazardPreventionandGeoenvironmentProtection,ChengduUniversityofTechnology,Chengdu610059,Sichuan,China:,,。,。,,,。,,。,,。,。:;;;;:P694:A:1671-2552(2009)08-1039-08XuQ,ChenW.Riskassessmentmethodforsinglerockfallgeo-disaster:acasestudyontherockfallinDanbaCounty,Sichuan,China.GeologicalBulletinofChina,2009,28(8):1039-1046Abstract:Basedoninternationalanddomesticrockfallriskassessmentpractice,thispaperhasputforwardtheriskassessmentmethodforsinglerockfallgeo-disastertakinganexampleofrockfallinDanbaCounty,Sichuan,China.Furthermore,relianceanalysisprogramofdangerousrockstabilityiscompiledbasedonbasicprincipleofMonte-Carlo,andprobabilityofinstabilitiesunderdifferentcondi-tionsarecalculated.Atthesametime,theauthortakesintoaccounttheimpactofgroundbuildingswhichcanblockthefallingrocks,motiontrajectoriesoffallingrocksaresimulatedinusingprofessionalsoftware,moreover,inaccordancewiththetopographyofstudyarea,theinfluencescopeisdelineatedalso.Vulnerabilityresearchofthedisaster-bearingbodiesandassetshawebeendevelopedac-cordingtothefieldinvestigationandlocalsocialeconomicdata.Inlightofaboveprobabilityandvulnerabilityanalysis,economiclosswithintheinfluencedareaunderdifferentconditionsandrockfallriskhasbeenundertaken.Theseresultscanprovidscientificbasisforcivilconstructionandplanningintheinfluencedareatoavoidandreducegeo-hazardseffectively.Keywords:rockfall;damageprobability;hazardousscope;vulnerability;riskassessmentGEOLOGICALBULLETINOFCHINA2009、、,,。,。,、、,,。,,Pierson[2-3];Azzoni[4](、、);Crosta[5-6],。,[7]、;[8]、、、,;[9](),,。,,,,,。1,,N30°52′45.1、E101°53′07.6。13,。60~70°,,,1~1.5m(1、2)。,。,,1Fig.1Cross-sectionmapofdangerousrockinDanbaCounty2Fig.2ElevationmapofdangerousrockinDanbaCounty10402882Table2Damageprobabilityofdangerousrock,、,。(1、2):,N∠62°;,293°∠83°;,10°∠25°。3,,4m×4m×3m。,,,,,,。13,。22.1,。、。。,、、。,。,K,K,K1,,。《》①。,,3:1:,;2:,;3:,、。,(Cφ)、、,。,。,Cφ。C、φ,(1000),:R=-2LnR1×cos2πR2姨(1)Cφ(2),Cφ(3~6):X=σR+μ(2),1。1000Cφ①,1000(Kf),,。Pi=N/N1(3),N,N1Kj1。27。,,0.149;,0.228;,0.485,1Table1Physicalparametersofstructuresurfaceofdangerousrock:1041GEOLOGICALBULLETINOFCHINA20097Fig.7Stabilitycoefficientanddamageprobabilityofdangerousrockunderdifferentcivilconditions。2.2、、、,,:、;、、;,。3C()Fig.3HistogramofprobabilitydistributionofCvalue(Naturalstatus)4C()Fig.4HistogramofprobabilitydistributionofC(Saturatedstatus)5φ()Fig.5Histogramofprobabilitydistributionofφ(Naturalstatus)6φ()Fig.6Histogramofprobabilitydistributionofφ(Saturatedstatus)10422889()Fig.9Thetrajectoriesoffallingrocks(Seismicstatus):12gt2+(vY0-qvX0)t+[Y0-Y1+q(X1-X0)]=0(4):vY0、vX0;q;Y0、X0;Y1、X1。Y2、X2,qq=Y2-Y1X2-X1,t:t=-b+b2-4ac姨2a,a=g/2;b=VY0-qVX0;c=Y0-Y1+q(X1-X0)。(XC,YC),[10]:Vi=VX02(VY0+g·XC-X0VX0)2姨(5),,。,,(Rn)(Rt),::Vrn=Rn×Vin(6):Vrt=Rt×Vit(7):Rn、Rt;Vin、Vit。,,。、,RnRt3。3:、。,。。500kJ,100kJ。,,8、9。,、、,,,104。89,3[10]Table3Normalcomponentsofrestitutioncoefficientandtangentialcomponentsofrestitutioncoefficient8()Fig.8Thetrajectoriesoffallingrocks(Naturestatusandrainstormstatus):1043GEOLOGICALBULLETINOFCHINA200910Fig.10PlanemapofinfluencedscopebyrockfallinDanbaCounty4Table4Horizontalmotiondistanceandinfluencedscopeoffallingrocksunderdifferentconditions5Table5Disaster-bearingbodiesstatusunderdifferentconditions,12;(3),2,。,。3:,、、。,、,。,、、,,5。,,、、,[11]。,、,:V(u)=ni=1ΣWi·F(s)i(8):V(u),Wii,F(s)ii10442888Table8Resultsofeconomicloss6Table6Totalvulnerabilityofdisaster-bearingbodiesinrockfalldisaster7[12]Table7Classificationofeconomicloss:,i。,,6。4,()2,:R=f(P,C)(9):R,P,C。,。,,。:、,7。(10),8。S=ni=1ΣVI·Wi·AI·P(10):S,i,VIi,Wi,AI,P。(8),(7),12,3。5(1)、,→→→。(2),3,,0.485。(3),,,。(4),,1214.72,3167.37。(5)、,,32.19、3.3681.17。,1045GEOLOGICALBULLETINOFCHINA2009。。:、、、、,。[1]OldrichHungr.Areviewoftheclassificationoflandslidesoftheflowtype[J].EnvironmentalandEngineeringGeoscience,2001,17:221-238.[2]PiersonLA,DavisSA,VanVickle.RockfallHazardRatingSystem:ImplementationManual[R].FederalHighwayAdministrationPublicationSA-93-057,1990:172.[3]CancelliA,CrostaG.Hazardandriskassessmentinrockfallproneareas[C]//ProceedingsConferenceonRiskandReliabilityinGroundEngineering.1993:177-190.[4]AzzoniA,LaBarberaG,ZaninettiA.Analysisandpredictionofrockfallsusingamathematicalmodel[J].InternationalJournalofRockMechanicsandMiningSciences&Geomechanical,1995,32(7):709-724.[5]CrostaGB,AgliardiF.Anewmethodologyforphysicallybasedrockfallhazardassessment[J].NaturalHazardsandEarthSystemSciences,2003,3:407-422.[6]GuzzettiF.RockfallhazardandriskassessmentalongatransportationcorridorintheNeraValley,centralItaly[J].EnvironmentalManagement,2004,34(2):191-208.[7].[M].:,1989.[8],.[J].,2003,25:18-21.[9],,.———[J].,2005,24:5544-5548.[10].[J]..2003,(12):81-82.[11].[J].,2005,20:13-15.[12].[D].,2007:21-23.①..2004:67-68.1046