雙隧道結(jié)構(gòu)及穩(wěn)定性開挖影響因素的數(shù)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,F(xiàn)LAC3Dumericalsimulation,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
近年來(lái)雙隧道的研究日益成為了科研界的主流話題,雙隧道的開挖會(huì)伴隨著諸多對(duì)隧道穩(wěn)定性不利的影響因素,例如:隧道的斷面尺寸、拱頂曲率、仰拱曲率以及地震效應(yīng)影響等。(剩余5141字)