深基坑上跨运营盾构隧道MJS加固方案优化分析

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中图分类号：U231 文献标志码：A 文章编号：1005-8249（2025）02-0060-08

DOI：10.19860/j.cnki.issn1005-8249.2025.02.011

Abstract：Inordertodeterminetheverticalupliftand horizontal deformationlawsofashieldtunnelconstructiononadeep foundationpit，acrossectiontunnelprojectonadeep foundationpitwastakenastheresearchobject.Thefiniteelement analysis method wasused to studythedeformationlawsofthetunnelunder diferentbasereinforcementareas，reinforcement depths，andreinforcement methods.Theresultsshow thattheuseof MJS basereinforcement method in silty strata can efectivelycontroltheupliftandhorizontaldeformationof tunnels，andreduce therelativedeformationoftunnelsections；The upliftdeformationofthetunneldecreaseswiththeincreaseofthebasereinforcementarea，andfullbotomreinforcement measuresshouldbetakentocontrolthedeformationofthetunel structure；Asthedepth offoundationreinforcementincreases， theupliftdeformationofthetunneldecreases.Afterthedepthoffoundationreinforcement excedsacertainlimit，increasingthe reinforcementdepthweakenstheefectofreducinguplftdeformation；Theportalreinforcementsystemformedbythe reinforcementofthestrataandfoundationonbothsidesofthe tunnelhassignificantadvantagesincontrolingthedeformationof thetunnel structure．Thehorizontaldeformationandupliftdeformationofthetunneldecreasewiththeincreaseofthe reinforcement width on both sides，and the optimal reinforcement width on both sides is 2 m .The research results can be used as a reference for similar projects.

Key words：pit；running tunnel；MJS construction method；numerical analysis；deformation；reinforcement plan

0 引言

随着我国城市化的不断发展，城市地下空间开发利用增长迅速，新建地下工程不可避免以邻近、上跨、下穿等多种方式临近既有地下建（构）筑物施工，增加了施工难度，对保障既有建筑安全提出了更高的要求。（剩余8194字）