變質(zhì)軟巖隧道大變形穩(wěn)定性評價(jià)及防治分級研究

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

關(guān)鍵詞：隧道；大變形；穩(wěn)定性；防治分級

中圖分類號：TU735 文獻(xiàn)標(biāo)志碼：A 文章編號：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，隧道工程數(shù)量越來越多，且在近年交通建設(shè)過程中，受區(qū)域地質(zhì)條件影響，隧道大變形事故時(shí)有發(fā)生，尤其在變質(zhì)軟巖隧道施工過程中，此類事故的威脅性相對更強(qiáng)，因此，構(gòu)建變質(zhì)軟巖隧道大變形事故的穩(wěn)定性評價(jià)及防治分級研究具有重要意義[1-2]。（剩余18722字）