沪通长江大桥主航道桥沉井地基作用应力变形分布特征研究

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1、桥梁建设2015年第45卷第6期(总第235期)3OBridgeConstruction，Vo1．45，No．6，2015(TotallyNo．235)文章编号：1003—4722(2015)06—0030—06沪通长江大桥主航道桥沉井一地基作用应力变形分布特征研究董亮，戴福忠，郭辉(中国铁道科学研究院铁道建筑研究所，北京100081)摘要：沪通长江大桥主航道桥为(14O+462+1092+462+14O)m双塔连续钢桁梁斜拉桥，29号主墩采用倒圆角的矩形沉井基础。为研究沉井施工及桥梁施工后沉井结构与地基间的受力特性，采用ABAQ

2、US有限元软件建立沉井一地基相互作用的三维实体模型，分析5种荷载组合下沉井基底和侧壁土体的应力和变形。结果表明，沉井施工和桥梁施工后，沉井基底和侧壁土体应力沿纵、横向分布差异较大；基底的竖向应力相对较为均匀，沉井隔墙对应处基底土体的附加应力略大；沉井深度范围内侧壁土体的附加应力受相应隔墙位置的影响显著；地基土体和沉井结构产生了一定的沉降变形，沉井的沉降差异主要由架梁引起，且对桥梁上部结构影响较大。关键词：公路铁路两用桥；斜拉桥；沉井；沉井一地基相互作用；有限元法；应力；变形中图分类号：U448．27；TU473．2文献标志码：AS

3、tudyofStressandDeformationDistributionCharacteristicsofOpenCaisson—FoundationBedInteractionforMainShipChannelBridgeofHutongChangjiangRiverBridgeDONGLiang，DAIFu—zhong，GUOHui(RailwayEngineeringResearchInstitute，ChinaAcademyofRailwaySciences，Beijing100081，China)Abstract：

4、ThemainshipchannelbridgeoftheHutongChangjiangRiverBridgeisadouble—py一1oncontinuousstee1trussgirdercable—stayedbridgewithspanarrangement(140+462+1092+462+140)m．ThefoundationforthemainpierNo．29ofthebridgeistherectangularopencaissonwithroundedcorners．Tostudythemechanical

5、characteristicsofthecaissonstructureanditsfoun—dationbedafterconstructionofthecaissonandthebridge，thefiniteelementsoftwareABAQUSwasusedtoestablishthethree—dimensionalsolidmodelforthecaissonandfoundationbedinterac—tionandthestressanddeformationofthefoundationbedandside

6、walIsoilofthecaissonunder5loadcombinationswereanalyzed．Theresultsoftheanalysisshowthataftertheconstructionofthecaissonandthebridge，thedifferencesofthelongitudinalandtransversestressdistributionofthefoundationbedandsidewallsoi1ofthecaissonaregreat．Theverticalstressofth

7、efoundationbedisrelativelyuniform，theadditionalstressofthefoundationbedsoilcorrespondingtothepar—titionwallsofthecaissonisslightlygreatandtheadditionalstressofthesidewallsoilinthedepthrangeofthecaissonisconsiderablyaffectedbythecorrespondingpositionsofthepartitionwall

8、s．Thefoundationbedsoilandthecaissonstructurehavesufferedcertainsettlementdeformation，thesettlementdifferencesofthecaissonare