第1期研究报告*住房和城乡建设部科学技术计划项目(2021-K-080)超软土盾构隧道接缝防水机理及优化措施*吕延豪孙雪兵张海涛(中铁第四勘察设计院集团有限公司，430063，武汉∥第一作者，正高级工程师)摘要为了对超出设计允许张开量、错台量情况下的盾构隧道接缝防水性能进行评价，探究满足防水要求的密封垫极限张开量、错台量，基于温州市城市轨道交通M1线地铁盾构隧道工程，对选取设计的一种密封垫进行极限张开与极限错台工况下的防水数值模拟，并对该密封垫断面进一步优化。研究结果表明:压缩密封垫需要的拼装力最大值为38．6kN/m，满足工程盾构隧道拼装力小于60kN/m的要求;在密封张开和错台工况下，密封垫防水能力都会减小;通过优化弹性密封垫断面形状，可提高接缝防水性能，满足工程需求。关键词地铁;盾构隧道;防水密封垫;张开量;错台量中图分类号U453．6DOI:10．16037/j．1007－869x．2023．01．004WaterproofMechanismandOptimizationMeasuresforShieldTunnelJointinUltra-softSoilLYUYanhao，SUNXuebing，ZHANGHaitaoAbstractInordertoevaluatethewaterproofperformanceofshieldtunneljointsthatarebeyondtheallowableopeninga-mountanddislocationamountofdesign，andtoexplorethelimitofsealinggasketopeningamountanddislocationamountthatmeetthewaterproofrequirements，basedontheshieldtun-nelprojectofWenzhouUrbanＲailTransitLineM1，adesignedsealinggasketisselectedforcarryingoutthewater-proofnumericalsimulationundertheconditionofextremeo-peninganddislocation，thenthesectionofthegasketisfurtheroptimized．Ｒesearchresultsshowthat:themaximumassemblyforcerequiredforcompressingthesealinggasketis38．6kN/m，whichmeetstherequirementofshieldtunnelassemblyforceofbeinglessthan60kN/m;underboththeworkingconditionsofsealingopeninganddislocation，thewaterproofabilityofsealinggasketwillbeweakened;butthejointwaterproofper-formancecanmeettheengineeringrequirementsbyoptimizingthesectionshapeoftheelasticsealinggasket．Keywordsmetro;shieldtunnel;waterproofsealinggasket;openingamount;dislocationamountAuthor'saddressChinaＲailwaySiyuanSurveyandDesignGroupCo．，Ltd．，430063，Wuhan，China盾构法隧道采用多块预制管片拼装而成，盾构管片接缝的张开、错台以及转动变形都可能会导致接缝密...
