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1、JournalofEngineeringGeology工程地質(zhì)學(xué)報1004-9665/2013/21(6)一0849.08土一水特征曲線預(yù)測非飽和土的抗剪強(qiáng)度對比研究術(shù)郭利娜①②胡斌①宋友建①張國超①(①中國地質(zhì)大學(xué)(武漢)工程學(xué)院武漢430074)(②浙江大學(xué)建筑設(shè)計研究院有限公司杭州310012)摘要目前,非飽和土的工程性質(zhì)已成為巖土工程界研究的熱點問題,而非飽和土的抗剪強(qiáng)度的研究對土的工程性質(zhì)尤為重要。筆者總結(jié)了4種用土-水特征曲線預(yù)測非飽和土的抗剪強(qiáng)度的公式,用5個Bar的壓力板儀測得了馬
2、家溝I號滑坡體上土體的土一水特征曲線,并采用MATLAB軟件,利用VanGenuchten模型對試驗數(shù)據(jù)進(jìn)行擬合;用國際先進(jìn)的GDS非飽和反壓剪切儀對控制基質(zhì)吸力為50kPa和100kPa的非飽和土進(jìn)行直剪試驗,得到了相應(yīng)的抗剪強(qiáng)度。用土一水特征曲線對非飽和土抗剪強(qiáng)度的4種預(yù)測值與試驗結(jié)果進(jìn)行對比分析,驗證各預(yù)測公式的準(zhǔn)確性,總結(jié)其優(yōu)缺點。最后得出Fredlund預(yù)測公式的準(zhǔn)確性最高,黃潤秋預(yù)測公式最為簡單易行。關(guān)鍵詞土.水特征曲線預(yù)測抗剪強(qiáng)度非飽和土中圖分類號:TU432文獻(xiàn)標(biāo)識碼:ACoNTR
3、ASTSTUDYoNFoRECASToFSHEARSTRENGTHoFUNSATU.RATEDSoILUSINGSoILWATERCHARACTERISTICCURVEGUOLina~HUBin①SONGYoujian~ZHANGGuocha0①((~)FacultyofEngineering,China面eofGeosciences,Wuhan430074)((~)ArchitecturalDesign&ResearchInstituteofZhejiangUnive~ity,Hangzhou3
4、10012)AbstractAtpresent,theengineeringpropertiesofunsaturatedsoilhavebecomeahottopicinthegeotechnicalengineeringfield.eshearstrengthofunsaturatedsoilisparticularlyimportantfortheengineeringpropertiesofsoil.Theauthorshavesummarizedfourformulaswhichcanf
5、orecasttheshearstrengthofunsaturatedsoilusingthesoilwatercharacteristiccurve.ThesoilwatercharacteristiccurveofMajiagouLandslideIisobtainedwiththefivebarpressureplateinstrument.rnleMATLABsoftwareandVanGenuchtenmodelareusedtofitthetestdata.1’}leinternat
6、ionaladvancedGDSunsaturatedbackpressureshearapparatus(UBPS)isusedtoproceedthedirectsheartestsontheunsaturatedsoil.Thematricsuctioniscontrolledtobe50kPaand100kPa.TherelevantshearstrengthiSobtained.Besides.thefourpredictedvaluesofsoilwatercharacteristic
7、curveandthetestresultarecompared.TheveracityofthepredictorformulasiSverified.Theirmeritsanddemeritsaresummarized.Finally.theFredlund’SpredictionformulaisthemostaccurateoneandtheHuang—Runqiu’Sformulaisthemostsimpleandpracticable.KeywordsSoilwatercharac
8、teristiccurve(SWCC),F(xiàn)orecast,Shearstrength,Unsaturatedsoil收稿日期:2012-10-30;收到修改稿日期:2013—04—20.基金項目:國家自然科學(xué)基金面上項目(41172281),國家科技部973項目(2011CB710604),中國博士后基金特殊項目(中博基[2009]l3),中央高校基本科研業(yè)務(wù)費專項資金項目(搖籃人才計劃CUGL100413),特色學(xué)科團(tuán)隊(CUG090104)資助.第一作者簡介:郭利娜,主要從事邊