武汉鹦鹉洲长江大桥南锚碇地下连续墙止水措施

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1、桥梁建设2013年第43卷第6期(总第223期)BridgeConstruction，Vo1．43，No．6，2013(TotallyNo．223)111文章编号：1003—4722(2013)06—0111—06武汉鹦鹉洲长江大桥南锚碇地下连续墙止水措施沈涛，刘一飞(1．中铁大桥局集团有限公司，湖北武汉430050；2．同济大学土木工程学院，上海200092)摘要：武汉鹦鹉洲长江大桥主桥为(200+2×850+200)m三塔四跨悬索桥，该桥南锚碇采用地下连续墙支护的明挖基础，地下连续墙为圆形结构，外径68m、壁厚1

2、．5m，设计深度不小于27．5m。该区域覆盖层厚度较薄，基岩为白云质灰岩，局部裂隙发育，地下水与长江水力联系密切，为做好地下连续墙基础止水，避免发生漏水险情，综合应用了防渗墙、铣接头、墙底嵌岩、帷幕灌浆等止水措施。经基坑开挖前的抽水试验、开挖过程中的监控监测、开挖后的实体验槽证明，地下连续墙墙体、接头缝、墙脚、基岩面均未发生渗水现象，未发生灾害性突水情况，实现了预期止水效果。关键词：悬索桥；锚碇；地下连续墙；防渗墙；帷幕灌浆；止水措施；桥梁施工中图分类号：U448．25；U443．164文献标志码：AWaterSto

3、pMeasuresforDiaphragmWallofSouthAnchorageofYingwuzhouChangjiangRiverBridgeinWuhanSHENTao，LIUYi—fei(1．ChinaRailwayMajorBridgeEngineeringGroupCo．，Ltd．，Wuhan430050，China；2．SchoolofCivilEngineering，TongjiUniversity，Shanghai200092，China)Abstract：ThemainbridgeofYingw

4、uzhouChangjiangRiverBridgeinWuhanisathree—tow—erandfour—spansuspensionbridgewithspanarrangement(200+2×850+200)m．Thefounda—tionforthesouthanchorageofthebridgeistheopenexcavatedfoundationsupportedondia—phragmwal1．Thediaphragmwallisacircularstructurethathasanexter

5、naldiameterof68m，wal1thicknessof1．5manddesigneddepthnotlessthan27．5m．Intheareawherethedia—phragmwalliS1ocated。theoverburdenisthin，thebaserockiSthedolomiticlimestonewithde—veloped1ocalfracturesandtheundergroundwaterthereiscloselyrelatedtothewaterpoweroftheChangj

6、iangRiver．Tostopthewaterfromcomingintothediaphragmwallandtoavoidthedan—geroussituationofwaterleakage，aseriesofthewaterstopmeasuresofthecutoffwall，cutjoints，wallfootingrockembedmentandcurtaingroutingwascomprehensivelytaken．Thewaterpumpingtestbeforeexcavatingofth

7、efoundationpit，themonitoringandcontrolintheprocessoftheexcavatingandtheinspectingofactualtrenchesaftertheexcavatingprovedthatnowaterleakedinthewallbody，joints，wallfootingofthediaphragmwallandintherocksurface，thedisastrouswatergushingdidnotoccurandtheanticipated

8、waterstopeffectwasachieved．Keywords：suspensionbridge；anchorage；diaphragmwall；cutoffwall；curtaingrouting；waterstopmeasure；bridgeconstruction1概述km，为(2O0+2×850+200)m三塔四跨悬索桥(图武汉