桥梁建设2023年第53卷第S1期(总第283期)BridgeConstruction,Vol.53,No.SI,2023(TotallyNo.283)127文章编号:1003-4722(2023)Sl-0127-07DOI:10.20051/j.issn.1003-4722.2023.SI.018宜都长江大桥南岸重力式锚碇基础方案比选罗勇1,姜炜1,易龙1,任蒙2(1.湖北交投宜昌高速公路建设管理有限公司,湖北宜昌443300;2.中交第二公路勘察设计研究院有限公司,湖北武汉430056)摘要:湖北宜都长江大桥(原名白洋长江公路大桥)为主跨1000m双塔单跨钢桁梁悬索桥,南岸(宜都岸)锚碇场地覆盖层厚约51.4m,其中中粗砂混卵石、卵石层厚约46.9m,属强透水、含水丰富地层,所含第四系孔隙水与长江水力相互连通,地下水位与长江水位基本持平。针对南岸锚碇工程区深厚富水砂卵石层的地质情况,提出沉井基础、地下连续墙基础和浅埋扩大基础方案,并从结构方案、施工方案、工程经济性等方面进行综合比选,推荐采用工程量最小、地下水位以上施工、经济性最优的浅埋扩大基础。浅埋扩大基础采用矩形平板基础,平面尺寸为101mX71.5m,基坑开挖深度为&0m。对该方案进行安全性验算,结果均满足设计和规范要求。关键词:悬索桥;锚碇基袖;卵石层;沉井基袖;地下连续墙基袖;浅埋扩大基础;方案比选;安全性验算中图分类号:U44&25;U443.1文献标志码:AFoundationSelectionforSouth-BankGravityAnchorageofYiduChangjiangRiverBridgeLUOYong1,JIANGWei1,YILong1,RENMeng2(1.HubeiJiaotouYichangExpresswayConstructionManagementCo.,Ltd.,Yichang443300,China;2.CCCCSecondHighwayConsultantsCo.,Ltd.,Wuhan430056,Hubei)Abstract:TheYiduChangjiangRiverBridge(originallyknownasBaiyangChangjiangRiverBridge)inHubeiProvinceisatwo-towersteeltrussstiffeninggirdersuspensionbridgewithamainspanof1000m.Thehangercablesareonlyarrangedinthecentralspan.Theoverburdenatthesouth-bankanchorage(Yiduside)isabout51.4mthick,wheremediumandcoarsesandsintersectwithpebbles,andthethicknessofthepebblelayerisabout46.9m,belongingtostronglyperviousandwater-richstratum,wheretheporewaterinthequaternarystratajoinswiththeChangjiangRiver,andtheporewaterlevelisbasicallyleveledwiththeChangjiangRiverwaterlevel.Toaddressthegeologicalconditionsatthenorth-bankanchorage,thecaissonfoundation,diaphragmwallfoundationandshallowly-buriedspreadfoundationwerecompare...