双隧道结构及稳定性开挖影响因素的数值研究及敏感性分析

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Numerical StudyandSensitivityAnalysisof InfluencingFactorsof Double Tunnel Structureand StabilityExcavation

LIU Yuan，GUO Pengfei

（Guangxi Road and Bridge Engineering Group Co.，Ltd.，Nanning 53O2OO，China）

Abstract：Thedesign，excavation，andonstructionofdoubletunnelshavealwaysbnakeytopicofresearchforscholarsathomeand abroad.Therearemanyfactorsthatafectdoubletunnels，andeach factormayleadtounforeseeableproblemsin tunnel excavation.Therefore，thisarticleusesindorrockmechanics experiments，FLAC3Dumericalsimulation，anddecisiontheorytostudy andanalyzefivecommoninfluencingfactorsonthestabilityofdouble tunnels，includingarchcurvature，doubletunnelspacing，tunnel archcurvature，excavationrockcohesion，andtunellengthThemostsensitivefactorsafectingtheexcavationofdoubletunelsae identified.Theresearchresultsshowthatastheurvatureofthetunelarchincreass，itsachdisplacement，maxiumpricipalstress， andmaximumverticalstressallshoadownwardtrend，whilethemaximumverticalstressoftecentralockcolumnsowsanupward trend；Thechangesinthespacingbetweendoubletunnelsandtheotherthreeinfluencingfactors willhavediferentimpactsonthe excavatioof doubletunnels.Onthisbasis，ajudgmentmatrixwasconstructedusingdecisiontheory，andsensitivityanalysiswas conductedonfivefactors thatafecttheexcavationofdoubletunnels.Basedontheprincipleofmaximummembershipdegree，thedesig ofarchcurvatureasdeterindastemostsensitivefactoaectingthestabilityofdoubletuel.Teresearchesultsprovidesientific basis for the design，excavation，scientific research，and testing of double tunnels in the future.

KeyWords：mechanical test；double tunnel；FLAC3D numerical simulation；influence factor；sensitivity analysis

0 引言

近年来双隧道的研究日益成为了科研界的主流话题，双隧道的开挖会伴随着诸多对隧道稳定性不利的影响因素，例如：隧道的断面尺寸、拱顶曲率、仰拱曲率以及地震效应影响等。（剩余5141字）