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1、第34卷第1期公路交通科技Vol．34No．12017年1月JournalofHighwayandTransportationResearchandDevelopmentJan．2017doi:10．3969/j．issn．1002-0268．2017．01．006加筋土-锚杆组合支护式路堤工作机理研究1,2,31,234任非凡,徐超,许强,王冠(1．同济大学岩土及地下工程教育部重点实验室,上海200092;2．同济大学土木工程学院,上海200092;3．地质灾害防治与地质环境保护国家重点实验室,四川成都6
2、10059;4．上海理工大学环境与建筑学院,上海200093)摘要:以宜-巴高速公路某加筋土路堤断面为研究对象,结合现场监测数据,采用弹塑性有限元计算程序对加筋土-锚杆组合支护结构的变形受力特性进行研究,并针对筋材刚度、加筋间距、坡后锚杆连接与否等因素进行参数分析。主要研究结果表明:加筋土路堤中相邻阶梯水平位移变化幅度较大,且坡后台阶处出现较大不均匀沉降,需保证此处填土的压实度;加筋土路堤最大水平位移和垂直位移随着筋材轴向刚度的增加而减小;随着加筋间距的增加,加筋土路堤的安全系数相应减小,各加筋体承担的荷载
3、不断增大;锚杆与加筋体连接情况下最大水平位移和垂直位移均较未连接的情况要小,安全系数提高。关键词:道路工程;加筋土-锚杆组合支护;数值计算;变形破坏特征;路堤中图分类号:TU441文献标识码:A文章编号:1002-0268(2017)01-0039-07StudyonWorkingMechanismofReinforcedSoil-anchorCombinedSupportingEmbankment1,2,31,234RENFei-fan,XUChao,XUQiang,WANGGuan(1．KeyLabor
4、atoryofGeotechnicalandUndergroundEngineeringofMinistryofEducation,TongjiUniversity,Shanghai200092,China;2．SchoolofCivilEngineering,TongjiUniversity,Shanghai200092,China;3．StateKeyLaboratoryofGeohazardPreventionandGeoenvironmentProtection,ChengduSichuan6100
5、59,China;4．SchoolofEnvironmentandArchitecture,UniversityofShanghaiforScienceandTechnology,Shanghai200093,China)Abstract:Takingacross-sectionofreinforcedembankmentofYichang-Badongexpresswayastheresearchobject,combingwithon-sitemonitoringdata,thestressanddef
6、ormationcharacteristicsofthereinforcedsoil-anchorsupportingstructurearestudiedusinganelastic-plasticfiniteelementprogram,andtheparametricanalysisonthereinforcementstiffness,reinforcementspacing,boltconnectionconditionsatbackslope,etc．iscarriedout．Themainre
7、sultshowsthat(1)thereisanobviouschangeinhorizontaldisplacementbetweenadjacentembankmentsteps,andlargerdifferentialsettlementisfoundaroundthebackslopestepwherethedegreeoffillcompactionshouldbeguaranteed;(2)themaximumhorizontalandverticaldisplacementsdecreas
8、eofthereinforcementwiththeincreaseofaxialstiffnessofreinforcement;(3)thesafetyfactordecreaseswiththeincreaseofreinforcementspacing,andthegeogridwillbearlargerload;(4)whenanchorsareconnectedwithgeogrids,themax
