大直径盾构隧道穿越对邻近地铁隧道影响的研究

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关键词：大直径盾构；近距离下穿；数值模拟；变形影响

中图分类号：U45 文献标志码：A 文章编号：1005-8249（2025）06-0060-06

DOI：10.19860/j.cnki.issn1005-8249.2025.06.011

Abstract：With the continuous developmentofurban undergroundspace，new tunnels inevitably pass throughexisting underground structuresatcloserange.Tothisend，basedonthebackgroundofthe SuzhouEastLarge Diameter Shield Tunel Underpass RailTransitLine5project，athree-dimensionalnumericalmodelwasestablishedthrough finiteelementsoftware to simulate the shield tunneling construction process，andthedeformation efectsof shield tunneling onexisting subwaytunnelsand groundsurfaces wereanalyzed.Basedonon-sitemeasurements，the causes of deformation in the surounding environment duringdiferentstagesoftunnel excavationwereexplored，andtargeteddeformationcontrolmeasureswereproposed.Theresults indicatethattunel excavation mainlycauses deformationof existing tunnels withintheoblique intersectionrange，withmaximum vertical displacementsof5.15mmand4.472mmfor existing tunelsandthegroundsurface，respectivelybothof whichare less than theengineeringrequirementof1Omm limit；The proportionof surfacesettlementand tunnel settlementcaused by shield tunneling is as high as 42.6% and 40.0% ，respectively，while the proportion of surface settlement and tunnel settlement during the later consolidation and stabilization stage is only 2.5% and 6，6% ，respectively. This study can provide some reference and guidance for similar projects.

Key words：large-diameter shield tunneling machine；wearingatcloserange；numerical simulation；deformation impact

0 引言

在复杂城市环境中，新建隧道近距离下穿既有地铁隧道的情况日益增多，施工过程中易引起既有隧道结构的附加变形，严重时甚至威胁运营安全[1-2]如何有效控制既有隧道的变形，确保其稳定性和正常使用功能，成为隧道工程领域亟待解决的关键问题。（剩余6035字）