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253Vol.25No.320043RockandSoilMechanicsMar.20042002-12-0990102002196710007598(2004)03037904610059TU441AStudyonslopedisplacementsduetorainfallQIGuo-qingHUANGRun-qiuNationalLaboratoryofGeologicalHazardandEngineeringGeologicalEnvironmentProtectionChengduUniversityofTechnology,Chengdu610059,ChinaAbstract:Thedeformationofaslopeandlandslideisaverycomplexproblem,andisanimportanceindexvalueofforecastingandprewarningthelandslidehazard.Thedisplacementofslopeduetorainfallisrelatedtosuctionandthestressstrainbehaviorofunsaturatedmaterial.Accordingtotestdata,theeffectofsuctiononthestressstrainbehaviorofunsaturatedsoilsisresearched;andthemoisturecontentstrainbehaviorofunsaturatedsoilsisbuilt.Basedonthis,themechanismandregularityofslopethedisplacementsduetorainfallhavebeendiscussed.TheWudulandslideisanalyzedbythistheory.Keywords:unsaturatedsoilssuctionsoilwatercharacteristiccurveconstitutivemodelofunsaturatedsoils1[1]2Fredlund[2][3]bwarwawarwarsr)lg()lg()lg()lg(uuuuuuuu------=--qqqq1rwa)(uu-rqbwa)(uu-wauu-2004qsq1rsrbwarwarwawa)()()()(qqqq--⎥⎦⎤⎢⎣⎡---=-uuuuuuuu22rqq=wauu-=rwa)(uu-rqwauu-rwa)(uu-sqq=wauu-bwa)(uu-=sqwauu-bwa)(uu-rqsqwauu-rwa)(uu-bwa)(uu-3[46]3.1[7])(wauu-ΔsveΔ)()()1(wawa0ssvuuuuemee--Δ⎥⎦⎤⎢⎣⎡+-=Δe30esem)(wauu-ΔsseΔ)()()1()(1)(3wawa0s2f2fssuuuuemee--Δ⎥⎦⎤⎢⎣⎡+-⎥⎦⎤⎢⎣⎡-=Δhhhhe421213232221ss])()()[(21eeeeeee-+-+-=521213232221s])()()[(21sssssss′-′+′-′+′-′=6msssh′=7hfh)(31321mssss′+′+′=′83.2[8]20021100kPa50kPa100kPa200kPa1[8]Table1Volumechangeandwatercontentbeforeandaftertheapplicationofsuction[8]/cm3/g/g//kPa/cm3/g/N-116.3529.7023.2127.960.90N-216.5229.2022.7128.580.9610016.4629.1628.400.96N-316.8729.6623.0328.790.9820016.6129.3627.490.95N-417.0829.6523.1428.130.9950016.4428.8824.810.92N-516.8229.8523.5726.640.93100015.9828.9422.780.83N-616.7529.9723.4727.700.93200015.1728.1119.770.741sveΔsweΔ1212sveΔsweΔ)(wauu-Δ⎥⎦⎤⎢⎣⎡+-=)1(0semeeAA⎥⎦⎤⎢⎣⎡--ΔΔ=)()(wawasvuuuuAe938031Fig.1Variationofvolumetricstrainintheunsaturatedsoilswithsuction2Fig.2Variationofporosityratiointheunsaturatedsoilswithsuction1A33AFig.3VariationofvaluesoffactorAwithsuction34)(wauu-ΔsseΔsv2f2fss)(1)(3ehhhheΔ⎥⎦⎤⎢⎣⎡-=Δ1010⎥⎦⎤⎢⎣⎡-2f2f)(1)(3hhhh4rqrwa)(uu-24⎥⎥⎥⎦⎤⎢⎢⎢⎣⎡⎥⎦⎤⎢⎣⎡---⎥⎦⎤⎢⎣⎡+-=Δ--rsrbwarwa0ssv)()(1)1(qqqqeuuuuemee11⎥⎥⎥⎦⎤⎢⎢⎢⎣⎡⎥⎦⎤⎢⎣⎡---⎥⎦⎤⎢⎣⎡+-⎥⎦⎤⎢⎣⎡-=Δ--rsrbwarwa0s2f2fss)()(1)1()(1)(3qqqqhhhheuuuuemee1211sveΔ12sseΔqsqq=sveΔ=⎥⎥⎦⎤⎢⎢⎣⎡⎥⎦⎤⎢⎣⎡---⎥⎦⎤⎢⎣⎡+-bwarwa0s)()(1)1(uuuuemee13sseΔ=⎥⎥⎦⎤⎢⎢⎣⎡⎥⎦⎤⎢⎣⎡---⎥⎦⎤⎢⎣⎡+-⎥⎦⎤⎢⎣⎡-bwarwa0s2f2f)()(1)1()(1)(3uuuuemeehhhh14rqq=00⎪⎭⎪⎬⎫-+-+-=++=])()()([21213232221ss321sveeeeeeeeeee15xU∂∂-=1eyV∂∂-=2ezW∂∂-=3eUV3812004Wzyx,,155[9]100mm400mm44[7]Fig.4RelationofcreepingmotionandmonthlyquantityofrainfallinWudulandslide[7]xbaye=16yxab1a=2.93.4b=0.00640.00812a=1.05b=0.0077166123[1]D.G,H...[M].1997.[2]FredlundDGXingA.Equationsforthesoil-watercharacteristiccurve[J].CanadianGeotechnicalJournal,199431521532.[3].[J].200120110701074.[4]FredlundDG.[J].1999215603608.[5]AlonsoEE,GensA,josaA,.[J].19951764251.[6].[J].1996173814.[7].[J].199618219.[8].[J].2002102129133.[9].[M].1998.382