基于折叠突变理论的双应变软化夹层隧道围岩稳定性分析

中图分类号：U25 文献标志码：A 文章编号：1005-8249（2025）02-0067-07

DOI：10.19860/j.cnki.issn1005-8249.2025.02.012

Abstract：Thestrainsofteningcharacteristicsof weak interlayersmaketunnelsurroundingrock excavationprone toacidentssuch asroffallandcollapse.Basedontheprincipleofpotentialenergyandtheconstitutiverelationshipofstrainsoftening characteristics，afoldedcatastrophemodelforthecombinationofdualstrainsoftening interlayersisestablishd，andacriterionfor catastrophicinstabilityoftunelsuroundingrockisderived.Theresultsshowthatthedisplacementof thedoublestrainsoftening interlayermainlychangesneartheweak interlayer.Asthediferenceinshearmodulusbetweentheweakinterlayerandthe surroundingrock massincreases，thereisalocalincreaseindisplacementattheinterlayer；Thesmalertheshear modulus，the moreproethesurroundingrockistosudeninstability；Thecollapsecatastrophetheorybasedcriterionforsurroundingrock instabilityindoublestraineak intercalatedtunelsisaplicableandcanbeusedasasupplementojudgetestabilityofsuouding rock.Theresearchresultscanprovide guidanceandreferenceforthedesignandconstructionofsimilartunel projects inthefuture.

Keywords：weak intercalation；double strainsoftening；instabilityof suroundingrock；folding mutation model；instability criterion

0 引言

近年来，随着隧道建设的迅猛发展，安全事故也频繁发生。（剩余6842字）