铁路隧道衬砌掉块机制分析及应急抢修研究

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中图分类号：U25 文献标志码：A 文章编号：1005-8249（2026）02-0112-08

DOI：10.19860/j.cnki.issn1005-8249.2026.02.018

Study on Mechanism Analysis and Emergency Repair of Railway Tunnel Lining Falling Block

GAO Yang1，²，REN Xu3 ， XU Weiming

（1. Key Laboratory of Structural Health Monitoring and Control， Shijiazhuang Tiedao University， Shijiazhuang O50043，China； 2. Yanzhao Modern Transportation Laboratory， Shijiazhuang O50043，China; 3.School of Civil Engineering， Shijiazhuang Tiedao University， Shijiazhuang O5O043， China）

Abstract：Voids behindthetunnelliningarchcausedbyconstructioncollapsewillresultinstressredistributioninthe surrounding rock.When thesurrounding rock in thevoid area becomes looseanddeteriorates duetoenvironmental influences， it maycauserock colapse，penetratingthe lining structureand seriouslythreatening train operationsafety.FLAC3Dwas used to simulatethelooseninganddeteriorationofthesurroundingrock，revealingthemechanical mechanismoflining block falingina railwaytunel，andthereinforcementmeasuresthatshouldbetaken.Teresultsindicatethattensilestressexistsinacertanarea of thesurroundingrockabovethetunnelliningvoid.Whenthelooseninganddeteriorationofthesurroundingrockcausetheplastic zonetoexpand totheareaabovethevoid，rock colapse mayoccur.Thepresenceofvoidsinthesuroundingrock abovethe tunnelliningaltesthestresstructureofthelining，reducingitssafetyfactor.Duringtheemergencyrepairprocess，theadoptio of emergency shotcreting and bolting measures reduced the plastic zone by 72.4% compared to conditions without such measures.

Moreover，asthestrengthoftheshoteretingandbolting parametersincreases，theareaoftheplasticzonegradualldecreases Theresearch findingscan providereference for emergencyrepair projects involving similar tunnel lining block faling incidents. Key words： railway tunnels； falling lining； perimeter rock collapse； emergency repairs

0 引言

随着我国经济的快速发展，铁路运营规模持续扩大。（剩余7824字）