淤泥质黏土水泥土典型力学性能指标试验研究

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1、淤泥质黏土水泥土典型力学性能指标试验研究阮庆，阮波，曾元，温凯，李贤超（中南大学土木工程学院，湖南长沙410075）摘要：结合湖南洞庭湖区某高速公路淤泥质黏土软基处理工程，进行淤泥质黏土水泥土室内配合比试验和无侧限抗压强度试验，研究水泥土的无侧限抗压强度影响因素、应力～应变关系和变形模量的变化规律。研究结果表明：淤泥质黏土水泥土的无侧限抗压强度随着养护龄期和水泥掺入比的增加而增加，随着含水率的增大而减小；无侧限抗压强度增长速率随着养护龄期的增大而减小，随着水泥掺入比的增大而增大；水泥土应力～应变全过程曲线可以分为加载初始阶段、塑性上升阶段、应力～应变下降阶段和残余强度阶段等四个阶段

2、；水泥土的变形模量随着水泥土的无侧限抗压强度的增大而增大；高含水率、低水泥掺入比、短龄期的试件呈现塑性破坏；低含水率、高水泥掺入比、长龄期的试件呈现脆性破坏。关键词：淤泥质黏土；水泥土；无侧限抗压强度；影响因素；变形模量；破坏模式中图分类号：U416.1文献标志码：A文章编号：ExperimentalresearchontypicalmechanicalperformanceindexofcementstabilizedmuddyclayRUANQing，RUANBo，ZENGYuan，WENKai，LIXian-chao（SchoolofCivilEngineering，Cent

3、ralSouthUniversity，Changsha410075，China）Abstract：Mechanicalpropertiesofcementstabilizedmuddyclayforhighwaysoftsoilfoundation,whichwasinDong-tingLakearea,wasdiscussedthroughthelaboratorytestofcementstabilizedsoilmixingproportioncombinedwithunconfinedcompressivestrength(UCS)test.Thefactorsinflue

4、ncingUCS，andthechangerulesofstress-strainrelationshipanddeformationmoduluswerechosenasthemechanicalpropertiesstudied.Theresultsindicatedthatwiththeincreaseofcuringperiodandcementratio,thestrengthofthespecimensincreasedsignificantly,however,thestrengthofthespecimensdecreasedwiththeincreaseofmoi

5、sturecontent.ThedevelopmentofthegrowthrateforUCSwasachievedbyincreasingcementratio.Nevertheless,thedecreaserateofUCSresultedfromtheincreaseofcuringdays.Theinitialleadingstage，plasticgrowthstage，stress-staindecreasedstage，andresidualstrengthstagemadeupstress-stainversusofcementstabilizedmuddycl

6、ay.ThedeformationmodulusofcementstabilizedsoilincreasedwiththegrowthofUCS.Plasticfracturecouldbedescribedfracturecharacteristicsofthespecimenwithhighmoisturecontent,lowcementratioandshortcuringdays.Atthesametime,thefracturecharacteristicsofthespecimenwithlowmoisturecontent,highcementratioandlo

7、ngcuringdays.Keywords：muddyclay；cementstabilizedsoil；UCS；influencingfactor；deformationmodulus；fracturecharacteristics淤泥类软土具有高含水率，高孔隙比，高压缩性，低渗透性，低固结系数等特性，这些特性决定了淤泥类软土无法直接作为天然地基。水泥土具有水硬、高强、低压缩性、低渗透性等特性。考虑到水泥土和淤泥质黏土的特性，可以采用水泥改良淤泥形成淤泥质黏土水泥土