一种深水组合基础的设计研究

《一种深水组合基础的设计研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、一种深水组合基础的设计研究李振岭57文章编号：1003—4722(2010)05—0057—03一种深水组合基础的设计研究李振岭(中铁大桥勘测设计院有限公司，湖北武汉430050)摘要：为了解决跨海大桥常见的水深、软基、基础沉降量大等难题，以规划中的琼洲海峡大桥中线桥为背景，研究分离的四柱式沉井+桩基的组合基础形式。该组合基础中的四柱式沉井上下设2道系梁(采用2个“一”字形或倒扣的“U”字形)；在沉井壁内打入桩。沉井与桩基础共同承受竖向力，减少了桩基数量；沉井基础可作为桩基础的施工平台，解决了海上施工平台难以搭建的难题；同时桩基础有利于

2、减少基础沉降。桩基和沉井所受竖向力按其与承台的竖向接触刚度来分配，桩身受力按低桩承台假定进行受力分析，分析结果表明桩身强度完全满足受力要求。该组合基础的下沉施工顺序和自浮式沉井的下沉施工顺序基本相同。关键词：桥梁基础；深基础；沉井基础；桩基础；组合基础；设计研究中图分类号：U443．13文献标志码：ADesignandStudyofaTypeofDeepwaterCombinedFoundationLIZhen—ling(ChinaRailwayMajorBridgeReconnaissance8LDesignInstituteCo．，

3、Ltd．，Wuhan430050，China)Abstract：ToprovidesolutiontOtheproblemsofdeepwater，softbaseandgreatfoundationsettlementamountthatarecommontothesea—crossingbridgesandwithreferencetothecentralalignmentbridgeoftheplannedQiongzhouNarrowsBridge，atypeofthecombinedfoundationmadeupofsepa

4、rated4-cloumntypecaissonspluspileshasbeenstudied．Inthefoundation，thecolumntypecaissonsareconnectedbythe2tiebeams(2nos．ofthe“一”shapeorreverse“U”shapebeams)thatarearrangedattheupperandlowerpartsofthecaissonsandthepilesarethendrivenintothecaissons．Sincethecaissonsandpileswi

5、lljointlycarrytheverticalforce，thenum—betsofthepilescanbereducedontheonehand，ontheotherhandthecaissonscanserveastheworkingplatformsforconstructionofthepilesandthedifficultyofsettinguptheplatformsoverseacanbetackled．Moreover，thepilesarehelpfultoreducethefoundationsettleme

6、nt．Thever—tica1forcecarriedbythepilesandcaissonswillbedistributedaccordingtOtheverticalcontactri—gidityamongthepiles，caissonsandpierbases．Theforcecarriedbytheshaftsofthepilesisana—lyzedaccordingtotheassumptionoflow—lyingpilecapsandtheresultsoftheanalysisprovethatthestren

7、gthoftheshaftscancompletelysatisfytherequirementsoftheforceconditions．Be—sides，thesinkingconstructionproceduresofthecombinedfoundationarebasicallyidenticaltothoseoftheself-floatingcaissonfoundation．Keywords：bridgefoundation；deepfoundation；caissonfoundation；pilefoundation

8、；cornbinedfoundation；designandstudy收稿日期：2O1O一07—13作者简介：李振岭(1965一)，男，教授级高工，1988年毕业于长沙铁道学院铁道工程专业，工学学士(1iz