全断面装配式隧道明洞结构分块设计及受力特征研究

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中图分类号：U455.4 文献标志码：A 文章编号：1005-8249（2025）06-0109-08

DOI：10.19860/j.cnki.issn1005-8249.2025.06.019

Abstract：Inorder topromotethefull-sectionassembledopen-cut tunnelstructureofrailwaytunnel，theinteralforceof the open-cuttunnel structure isanalyzedbasedontheload-structuremethod.Combined with the assembled block method，the minimum bending moment position block method with lesstressdisturbance iscompared with themaximum bending moment block methodof activelyadjustingthestress modeof the structure，andthebolt-spring modelisestablished toanalyze the mechanicalpropertiesof thestructure.Theresultsshowthatthedisplacementand stress of the maximumbending momentblock methodarehigherthanthoseof theminimumbendingmomentblock method，andthesafetyfactorisslightlylowerthanthe later.Theincreaseofthenumberofjointswilleadtotheincreaseofthedisplacementandstress of theopen-cuttunel structure andthedecreaseof thesafetyfactor.Among them，thethirdschemeis basedontheminimum bending moment positionof theopen-cuttunelstructure，andthesidewallisdividedinto2blocks，withatotalof6blocksinthe wholering. Thedisplacementand interalforceoftheschemearethesmalest，thesafetyfactoristhehighest，andthesurplusamountis 1.18.Inthecaseofreducingthedisturbancetotheoriginalstructure，theminimumbending momentposition isselected for block design，whichreduces thenumberofblocksandreducesthedisturbancetotheoriginalstructure，soas to improve the safety and stability of the assembled open-cut tunnel structure.

Key words：pipe jacking；soft soil subgrade；numerical simulation；bridge head jumping；gradual replacement method

0 引言

近年来，随着我国铁路隧道建设的快速发展，对复杂线路的运营安全、环境保护与全生命周期成本管控提出了更高要求[1]。（剩余8310字）