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1、第34卷第3期公路交通科技Vol．34No．32017年3月JournalofHighwayandTransportationResearchandDevelopmentMar．2017doi:10．3969/j．issn．1002-0268．2017．03．001甜菜碱处治膨胀土效果及机理研究1123殷志祥,高哲,冯瑶,谷松原(1．辽宁工程技术大学研究生院,辽宁阜新123000;2．锦州市开发区财政投资评审中心,辽宁锦州121000;3．同济大学道路与交通工程教育部重点试验室,上海201804)摘要:采用十二烷基三甲基胺乙内酯(甜菜碱)
2、处治辽西某地膨胀土路基,以提高膨胀土路基结构强度。同时设计试验,揭示甜菜碱处治膨胀土的机理。在测定所用膨胀土基本物理性质参数的基础上,通过CBR试验、无侧限抗压试验、自由膨胀试验、干湿循环后的无侧限抗压试验等,验证甜菜碱对膨胀土的处治作用。试验结果表明甜菜碱能够提高膨胀土的强度和抵抗干湿循环的能力,同时降低膨胀土自由膨胀率,试验条件下的经济掺量为0．6%。此外根据双电层理论分析了甜菜碱处治膨胀土的机理。进而通过吸附试验和阳离子交换试验证明,甜菜碱分子内氮原子上的正电荷、长脂肪碳链、羧基均具有处治膨胀土的作用。关键词:道路工程;膨胀土路基;
3、离子交换试验;甜菜碱处治;膨胀土;吸附试验中图分类号:TU472．5文献标识码:A文章编号:1002-0268(2017)03-0001-06StudyonEffectandMechanismofUsingBetainetoTreatExpansiveSoil1123YINZhi-xiang,GAOZhe,FENGYao,GUSong-yuan(1．SchoolofPostgraduates,LiaoningTechnicalUniversity,FuxinLiaoning123000,China;2．FinancialInvestmen
4、tReviewCenterofJinzhouDevelopmentZone,JinzhouLiaoning121000,China;3．KeyLaboratoryofRoadandTrafficEngineeringofMinistryofEducation,TongjiUniversity,Shanghai201804,China)Abstract:Attemptsaremadetousedodecylbetainetomodifytheexpansivesoilsubgradesandenhanceitsstructurestreng
5、thinwestLiaoningProvince．Then,theexperimentsaredesignedtorevealthemechanismofusingbetainetostabilizeexpansivesoil．Aftertestingthebasicphysicalpropertyparameteroftheexpansivesoil,CBR,unconfinedcompressiontest,freeswellingtest,andunconfinedcompressiontestafterwet-drycyclesa
6、reconductedtoverifythetreateffectofbetaineonexpansivesoil．Thetestresultshowsthatbetainehastreateffectonexpansivesoilandtheresistancetowet-drycycling,andreducethefreeswellration．Ithasalsobeendeterminedthattheeconomicmassfractiontomodifythiscertainexpansivesoilis0．6%．Beside
7、s,thetreatmechanismofbetaineisanalyzedbaseduponthe“doubleelectriccationlayertheory”.Itisfoundandprovedbyadsorptiontestandcationexchangetestthatthepositivechargeonthenitrogenatom,longaliphaticcarbochain,andcarboxylallcontributetoimprovethestrengthofexpansivestrength．Keywor
8、ds:roadengineering;expansivesoilsubbase;cationexchangetest;betainetreatment;expansivesoil;adsorp
