基于有机质土加固试验研究

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1、浙江大学硕士学位论文有机质土加固试验研究姓名：刘增永申请学位级别：硕士专业：岩土工程指导教师：徐日庆20050301摘要有机质的存在会引起土的高塑性、高收缩性、高压缩性、低渗透性和低强度。对有机质含量较高的土，一般都需进行加固处理，才能满足工程上的要求。本文通过室内试验，将有机质与杭州某下地的粘土配制成不同有机质含量的土，进行液塑限试验，讨论了有机质含量与土的液塑限、塑性指数之间的关系。对杭州某工地的粉质粘土添加有机质，进行水泥加固与水泥+GR03加固对比试验，主要讨论了GR03掺量、有机质含量、水泥掺量、水灰比、龄期等因素对固化土无侧限抗压强度的影响。对固化土进行了三轴不固结不排水

2、试验，讨论了固化土的破坏形式及其应力应变关系。在试验范围内，主要结论有:1.塑限与有机质含量可用线性函数模拟;液限与有机质含量的关系可用指数型函数模拟。2.水泥加固试验表明:固化土的强度随有机质含量的增加呈指数衰减，随水泥掺量的增加呈S型增加，与水灰比的关系可用抛物线模拟，与龄期的关系可用双曲线函数模拟。3.水泥+GR03加固试验表明:GR03能提高固化土的强度，其固化土的强度随有机质含量的增加呈指数衰减，与水泥掺量的关系可用幂函数模拟，与水灰比的关系可用双曲线函数模拟，与龄期的关系可用双曲线函数模拟。4.固化土的应力应变可用指数型函数模拟。关键词:有机质土，塑限，液限，GR03，固

3、化土，应力应变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