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1、第34卷第5期公路交通科技Vol．34No．52017年5月JournalofHighwayandTransportationResearchandDevelopmentMay2017doi:10．3969/j．issn．1002-0268．2017．05．007非饱和玄武岩残积土强度特性及其边坡稳定性分析1121,31李勇,雷学文,孟庆山,陈洁,张浪(1．武汉科技大学城市建设学院,湖北武汉430065;2.中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071;3.仲恺农业工程学院城市建设学院,广东广州510225)摘要:为探
2、究非饱和土抗剪强度及其指标随含水率的变化规律,以毕威高速公路沿线某边坡黄褐色玄武岩残积土为研究对象,进行了控制含水率的直剪试验和土水特征曲线测试试验,通过Abaqus建立以此边坡为原型的有限元模型,在此基础上运用强度折减法对不同含水率的边坡进行稳定性分析,并结合试验所得的土水特征曲线分析基质吸力对边坡稳定性的影响。结果表明:随含水率增大,抗剪强度先基本不变后大幅度减小,黏聚力与内摩擦角均呈阶段性减小;基质吸力对抗剪强度的贡献随基质吸力的增大而逐渐减小并最终趋近于无影响;含水率对玄武岩残积土质边坡稳定性有较大的影响,边坡土体的含水率大于30%后,随含水率
3、增加,边坡安全系数大幅度降低;含水率增大会降低土体的基质吸力,在边坡土体接近饱和时,基质吸力的丧失对边坡稳定性影响最大,此时边坡最易失稳滑塌。关键词:道路工程;玄武岩残积土;直剪试验;抗剪强度;边坡稳定性;基质吸力中图分类号:U412．22文献标识码:A文章编号:1002-0268(2017)05-0050-07StudyonStrengthCharacteristicsofUnsaturatedBasaltResidualSoilandItsSlopeStability1121,31LIYong,LEIXue-wen,MENGQing-shan,CH
4、ENJieZHANGLang(1．SchoolofUrbanConstruction,WuhanUniversityofScienceandTechnology,WuhanHubei430065,China;2．StateKeyLaboratoryofGeomechanicsandGeotechnicalEngineering,InstituteofRockandSoilMechanics,ChineseAcademyofSciences,WuhanHubei430071;3．SchoolofUrbanConstruction,ZhongkaiUniv
5、ersityofAgricultureandEngineering,GuangzhouGuangdong510225,China)Abstract:Inordertoexploretheruleofshearstrengthanditsindexesvaryingwithwatercontentofunsaturatedsoil,thedirectsheartestofcontrolledwatercontentandthetestofsoil-watercharacteristiccurveonthebrownbasaltresidualsoilfr
6、omaselectedslopeofBijie—Weiningexpresswayareconducted．BasedonthefiniteelementmodeloftheslopeestablishedbyAbaqus,theslopestabilitywithdifferentwatercontentsareanalysedbyshearstrengthreductionmethod,andtheeffectofmatricsuctiononslopestabilityisanalyzedwiththesoil-watercharacterist
7、iccurveobtainedfromtheexperiment．Theresultshowsthat(1)withtheincreaseofwatercontent,theshearstrengthbasicallyremainsatfirstandthendecreasessignificantlythecohesionandinternalfrictionanglepresentatrendofdecreaseinstage;(2)thecontributionofmatrixsuctiontoshearstrengthgraduallydecr
8、easesandeventuallytendstozerowiththeincreaseofm
