泰州长江公路大桥南锚基础沉降计算研究

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1、泰州长江公路大桥南锚基础沉降计算研究冯兆祥，王建49文章编号：1003—4722(2010)01—0049—03泰州长江公路大桥南锚基础沉降计算研究冯兆祥，王建。(1．江苏省长江公路大桥建设指挥部，江苏泰州225321；2．河海大学，江苏南京21O098)摘要：泰州长江公路大桥为三塔两跨悬索桥，两岸锚碇采用沉井基础。采用工程类比法和有限元法，分别在设计和施工阶段预测该桥南锚基础的沉降值。工程类比法以已经建成的江阴长江大桥北锚为原型，基于弹性理论类比出待建的泰州长江公路大桥南锚的沉降量，施工期沉降观测值表明，实际沉降值约为类比值的60％，类比值仅能供初步设计参考。有限元法则根据锚碇浇注过程中

2、的实测沉降反演出力学参数，然后预测施工后期即架缆和桥面铺装阶段锚拉点的位移，计算结果表明，运用反演后的参数可以较准确地描述不同施工阶段沉井的变形特征，并指导后期施工。关键词：泰州长江公路大桥；锚碇；沉井基础；沉降；有限元法；计算中图分类号：U443．131文献标志码：ACalculationandResearchofSettlementofSouthAnchorageFoundationofTaizhouChangjiangRiverHighwayBridgeFENGZhao-xiang，WANGJian。(1．JiangsuProvincialYangtzeRiverHighwayBri

3、dgeConstructionCommandingDe—partment，Taizhou225321，China；2．HohaiUniversity，Nanjing210098，China)Abstract：TaizhouChangjiangRiverHighwayBridgeisathreetowersuspensionbridgeandtheanchoragesoftheBridgeonbothbanksrestoncaissonfoundations．Theengineeringanalogymethodandfiniteelementmethodareusedtorespectiv

4、elypredictthesettlementvalueofthesouthanchoragefoundationatthedesignandconstructionstages．Intheengineeringanalogymethod，thenorthanchorageofthecompletedJiangyinChangJiangRiverBridgeistakenastheprototypeandonthebasisoftheelasticitytheory，thesettlementamountofthesouthanchorageoftheTaizhouChangjiangRi

5、verHighwayBridgetobebuildisanalogized．Theobservedsettle—mentintheconstructionofthesouthanchorageshowsthattheactualsettlementvalueinthecon—structionaccountsforabout60oftheanalogizedvalueandtheanalogizedvaluecanbeonlyusedforreference．Inthefiniteelementmethod，themechanicalparametersareinverselyderive

6、dinaccordancewiththemeasuredsettlementvalueintheprocessofconcretecastingforthean—chorageandthedisplacementattheanchoringpointsofthelateperiodofconstructionofmainca—bleerectionanddecksurfacingiSpredicted．Theresultsofcalculationdemonstratethattheutili-zationoftheinverselyderivedparameterscancorrectl

7、yrepresentthedeformationcharacteristicsofthecaissonatdifferentconstructionstagesandcanguidetheconstructioninthelateperiod．Keywords：TaizhouChangjiangRiverHighwayBridge；anchorage；caissonfoundation；set—tlement；finit