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时间:2020-04-19
《风化砂改良膨胀土机理及边坡稳定性分析.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第5No.■10URNALOF1IANGSUUNIVERSITY(NaturalScienceEdition)doi:10.3969/j.issn.1671—7775.2014.05.019风化砂改良膨胀土机理及边坡稳定性分析杨俊,黎新春,张国栋。,唐云伟,梁勇。(1.三峡大学土木与建筑学院,湖北宜昌443002;2.湖北省宜昌市交通运输局,湖北宜昌443002;3.湖北省宜昌市夷陵区小鸦一级公路改建项目部,湖北宜昌43002)摘要:研究了风化砂改良膨胀土的作用机理,揭示了风化砂与膨胀土发生的物理化学反应,得到了风
2、化砂掺量与膨胀土的胀缩特性及强度特性之间存在的关系.结合宜昌市小溪塔至鸦鹊岭一级公路施_T-项目,采用条分法对填土高度为10m路堤的整体稳定性进行了分析.结果表明:现采用原状膨胀土填筑路堤安全系数较小,不能满足规范要求;而采用风化砂改良之后的膨胀土填筑的路堤边坡稳定系数比原状膨胀土均有显著提高,能够满足规范要求;路基的安全系数随着掺砂比例的增加先增大后减小,当掺砂比例达到20%,改良膨胀土填筑的路基安全系数达到最大值.关键词:膨胀土;风化砂;抗剪强度;稳定性分析;安全系数中图分类号:TU411.3文献标志码:A文章
3、编号:1671—7775(2014)05—0600—05引文格式:杨俊,黎新春,张国栋,等.风化砂改良膨胀土机理及边坡稳定性分析[J].江苏大学学报:自然科学版,2014,35(5)600一^I14Improvingmechanismofexpansivesoilbyweatheredsandandslopestabilityanalysis一r-郫-L一5YangJun,LiXinchun,ZhangGuodong,TangYtmwei,LiangYong卷(1.CivilandArchitecturalInst
4、itute,ChinaThreeGorgesUniversity,Yiehang,Hubei43002,China;2.YichangTransportBureau,YichangHubei43002,China;3.XiaoxitatoYaquelingFirst—ClassHighwayRebuildingEngineeringProject,Yichang,Hubei43002,China)Abstract:Theimprovingmechanismofexpansivesoilbyweatheredsand
5、wasinvestigatedthroughthein—doorexperiment.Thephysicalandchemicalreactionsbetweenweatheredsandandexpansivesoilwererevealedtodiscusstherelationshipbetweenweatheredsandcontentandswellingshrinkagecharacteristicsofexpansivesoil.Basedonlaboratoryexperiments,forthef
6、irst·classhighwayrebuildingengineeringcon-structionprojectfromYichangXiaoxitatoYaqueling,theoverallstabilityanalysisofembankmentwith10mheightwasconductedbystripmethod.Theresultsshowthatthesafetycoefficientofembankmentwithnaturalexpansivesoilissmall,whichcannot
7、meetthespecificationrequirements.Comparedwiththeembankmentwithundisturbedexpansivesoil,theslopestabilitycoeficientofembankmentwithwea—theredsandimprovingexpansivesoilwassignificantlyimproved,whichcanmeetthecoderequirements.Withtheincreasingofsandmixingratio,th
8、esafetycoeficientofsubgradeisincreasedfirstwithlaterde—crease.Whenthesandratioreaches20%,themaximumsafetycoeficientofimprovedexpansivesoilfil—lingroadbedisachieved.Keywords:expansi
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