武汉鹦鹉洲长江大桥北锚碇新型沉井基础设计

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1、武汉鹦鹉洲长江大桥北锚碇新型沉井基础设计李明华，杨灿文文章编号：1003—4722(2011)04-0001—04武汉鹦鹉洲长江大桥北锚碇新型沉井基础设计李明华，杨灿文(中铁大桥勘测设计院有限公司，湖北武汉430056)摘要：武汉鹦鹉洲长江大桥主桥为三塔四跨悬索桥。该桥北锚碇基础经多方案比选采用多圆孔环形截面新型沉井结构。沉井中间大圆孔内设置十字形隔墙，圆环内沿圆周均布有小直径井孔。沉井总高43m，共分8节，第1节为钢壳混凝土沉井，第2～8节均为钢筋混凝土沉井。北锚碇施工中采用不排水下沉、井壁增加空气幕等措施减小施工难度及风险。采用

2、软件FLAC3D对沉井施工过程进行数值模拟分析，评估施工安全性能、施工引起的环境效应及运营加载后锚碇基础的变形等。计算结果表明，沉井分节下沉施工过程中其结构、地面变形均满足规范要求，施工可有效避免对周围建筑物和长江大堤的不利影响。关键词：悬索桥；锚碇；沉井基础；设计；施工；有限元法中图分类号：U443．24文献标志码：ADesignofNewTypeCaissonFoundationforNorthAnchorageofYingwuzhouChangjiangRiverBridgeinWuhanLIMing—hua，lANGCnn-

3、wen(ChinaRailwayMajorBridgeReconnaissance＆DesignInstituteCo．，Ltd．，Wuhan430056，China)Abstract：ThemainbridgeofYingwuzhouChangjiangRiverBridgeinWuhanisathree—tow—erandfour-spansuspensionbridge．Aftercomparisonofdifferentdesignproposals，itwasdeter—minedthatanewtypecaissonst

4、ructureofcircularcrosssectionandwithmultipleroundwellswouldbeusedforthenorthanchoragefoundationofthebridge．Inthebigsizewellinthecenterofthecaisson，thecrisscrossdiaphragmwassetandalongtheperipherywithinthecaisson，anumberofsmal1sizewellswereuniformlyset．Thecaissonis43mhi

5、ghandhastotally8lifts，ofwhichthefirstliftiSastee1shellconcretecaissonandtherestpartsofthecaissonfromthesec-ondtotheeighthliftsareallofreinforcedconcretecaissons．Intheconstructionofthecaisson，thecaissonwassunkdownbynodewateringandtheaircurtainwasprovidedinthecaissonwall

6、toreducesinkingdifficultyandconstructionrisk．ThesoftwareFLAC3Dwasusedtoconductnu-mericalsimulationandanalysisoftheconstructionprocessofthesinkingandtOevaluatethecon—structionsafety。theenvironmenta1effectcausedbytheconstructionandthedeformationofthefoundationtobeapplied

7、withloadafterthebridgewasputintooperation．Theresultsofthea—nalysisshowthatintheprocessofsinkingthecaissoninlifts，thecaissonstructureandgrounddeformationcanmeettherelevantrequirementsinthecodesandtheadverseinfluenceofthecon—structionontheambientbuildingsandtheriverdykec

8、anbeeffectivelyavoided．Keywords：suspensionbridge；anchorage；caissonfoundation；design；construction；finiteelementmethod收