变质软岩隧道大变形稳定性评价及防治分级研究

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Studyon Stability Evaluation and Prevention Classification of Large Deformation in Metamorphic Soft Rock Tunne

关键词：隧道；大变形；稳定性；防治分级

中图分类号：TU735 文献标志码：A 文章编号：1005-8249（2025）01-0082-07

DOI：10.19860/j.cnki.issn1005-8249.2025.01.016

WU Dayong

(Citic Construction Co.，Ltd.，Beijing 10OO27，China)

Abstract：Inordertoefectivelyevaluatethestabilityof largedeformationinmetamorphicsoftrock tunnelsandreasonably clasify theirpreventionandcontrollevels，theJunling Tunnelistakenastheengineringbackground.Basedontheanalysisof itslargedeformationcharacteristics，thestabilityofthelargedeformationsectionoftetunnelisfistevaluatedusingsarppoint mutationanalysis.Then，thepreventionandcontrolclasificationof largedeformationinthetunnelisstudiedthrough cumulativedeformationcriteriaanddeformationratecriteria.Theanalysisresultsshowthatinthedeformationmonitoringresults of the large deformation analysis section of Shangjunleng Tunnel，the deformation range of horizontal convergence is 142.03～ （204 219.28 mm，and the deformation range of arch crown settlement is 153.20～251.62 mm ，both of which are significantly greater thanthedeformationcontrolvaluesandhavesignificantdeformationcharacteristics.Inthestabilityevaluationresultsofthelarge deformation section，the values of horizontal convergence under the corresponding monitoring section conditions are all greater than the value of arch crown settlement.That is tosay，inthe large deformation section of the tunnel，thearch crown settlement has a relatively greater risk of instability and collapse，and the value at local positions is less than O，indicating a higherriskoflocalinstability.Intheresearchontheclasificationofpreventionandcontroloflargedeformationsectionsin tunnels，therearecertaindiffrencesintheclasificationresultsofthetwocriteria.Acording totheprincipleofdisadvantage， it isrecommendedthatthelargedeformationsections studiedbepreventedandcontroledaccordingtolevelIV.Therefore，in theconstructionprocesofShangjunlengunel，oncelargedeformationoccrs，itsstabilityisgenerallyelativelywakandhas ahighlevelofpreventionandcontrol.Itisrecommendedtostrictlyfolowtheanalysis methodtocarryoutconstructionwaing， avoid unnecessary losses， and provide certain technical guidance for its subsequent construction.

Key words： tunnel； large deformation； stability；prevention and control grading

0 引言

近年，隧道工程数量越来越多，且在近年交通建设过程中，受区域地质条件影响，隧道大变形事故时有发生，尤其在变质软岩隧道施工过程中，此类事故的威胁性相对更强，因此，构建变质软岩隧道大变形事故的稳定性评价及防治分级研究具有重要意义[1-2]。（剩余18722字）