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1、浙江大學(xué)碩士學(xué)位論文有機(jī)質(zhì)土加固試驗(yàn)研究姓名：劉增永申請學(xué)位級別：碩士專業(yè)：巖土工程指導(dǎo)教師：徐日慶20050301摘要有機(jī)質(zhì)的存在會引起土的高塑性、高收縮性、高壓縮性、低滲透性和低強(qiáng)度。對有機(jī)質(zhì)含量較高的土，一般都需進(jìn)行加固處理，才能滿足工程上的要求。本文通過室內(nèi)試驗(yàn)，將有機(jī)質(zhì)與杭州某下地的粘土配制成不同有機(jī)質(zhì)含量的土，進(jìn)行液塑限試驗(yàn)，討論了有機(jī)質(zhì)含量與土的液塑限、塑性指數(shù)之間的關(guān)系。對杭州某工地的粉質(zhì)粘土添加有機(jī)質(zhì)，進(jìn)行水泥加固與水泥+GR03加固對比試驗(yàn)，主要討論了GR03摻量、有機(jī)質(zhì)含量、水泥摻量、水灰比、齡期等因素對固化土無側(cè)限抗壓強(qiáng)度的影響。對固化土進(jìn)行了三軸不固結(jié)不排水
2、試驗(yàn)，討論了固化土的破壞形式及其應(yīng)力應(yīng)變關(guān)系。在試驗(yàn)范圍內(nèi)，主要結(jié)論有:1.塑限與有機(jī)質(zhì)含量可用線性函數(shù)模擬;液限與有機(jī)質(zhì)含量的關(guān)系可用指數(shù)型函數(shù)模擬。2.水泥加固試驗(yàn)表明:固化土的強(qiáng)度隨有機(jī)質(zhì)含量的增加呈指數(shù)衰減，隨水泥摻量的增加呈S型增加，與水灰比的關(guān)系可用拋物線模擬，與齡期的關(guān)系可用雙曲線函數(shù)模擬。3.水泥+GR03加固試驗(yàn)表明:GR03能提高固化土的強(qiáng)度，其固化土的強(qiáng)度隨有機(jī)質(zhì)含量的增加呈指數(shù)衰減，與水泥摻量的關(guān)系可用冪函數(shù)模擬，與水灰比的關(guān)系可用雙曲線函數(shù)模擬，與齡期的關(guān)系可用雙曲線函數(shù)模擬。4.固化土的應(yīng)力應(yīng)變可用指數(shù)型函數(shù)模擬。關(guān)鍵詞:有機(jī)質(zhì)土，塑限，液限，GR03，固
3、化土，應(yīng)力應(yīng)變ABSTRACTTheexistenceoftheorganicmaterleadstothesoilhighplasticity,highcontractility,highcompressibility,lowpermeationcoeficientandlowstrengths.Generally,thehighorganicmatterratiosoilshouldbereinforcedtosatisfytheneedoftheengineering.Throw助thelaboratoryexperiments,acertainclayinHangzhouis
4、mixedwithorganicmatterandtheAtterberglimitstestoftheorganicsoiliscariedontostudytherelationshipbetweenorganicmatterratioandliquidlimits,plasticlimits,andplasticityindex.MixingtheorganicmaterintoacertainsiltyclayinHangzhou,theorganicsoilisreinforcedwiththecementorthecementmixingwiththeGR03Unconf
5、inedcompressiontestsarecarriedontostudytherelationshipbetweenthestrengthoftheedsoilandGR03mixingratio,organicmatterratio,cementmixingratio,W/Cratio,time,etc.Theunconsolidated-undrainedtriaxialcompressiontestsarecarriedontoanalyzetheruptureformofthesoilandtosimulatetherepresentativestress-strain
6、curvesThemainconclusionsarelistedasfollows:Therelationshipbetweentheratiooftheorganicmatterandliquidlimitscanbesimulated勿alinearfunctionTherelationshipbetweentheratiooftheorganicmatterandplasticlimitscanbesimulated勿alinearfunction,Thereinforcingexperimentswithcementshowthattherelationshipbetwee
7、nstrengthandorganicmaterratiocanbesimulated妙adecayingexponentialfunction,therelationshipbetweenstrengthandcementmixingratiocanbesimulatedbyans-gmwthfunction,therelationshipbetweenstrengthandW/Cratiocanbesimulatedbyaparabolafunctio
