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基于隧道开挖空间效应的掌子面坍塌分析.docx

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基于隧道开挖空间效应的掌子面坍塌分析 Abstract Thecollapseoftheroofofatunnelduringexcavationisacommonproblemfortunnelengineers.Thephenomenonofroofcollapseiscausedbyvariousfactors,includinggeologicalconditions,stressdistribution,andexcavationmethods.Inthisstudy,weinvestigatethecollapseoftheroofofatunnelundervariousexcavationconditionsusingafiniteelementsimulationapproach. ThestudyfocusesonthePalinetunnelinItaly,whichwasexcavatedusingadrill-and-blastmethod.Theexcavationwasconductedinaheterogeneousgeologicalenvironment,whichposedasignificantchallengetothestabilityofthetunnel.Thestudyemploysthree-dimensionalfiniteelementmodelstoinvestigatethedistributionofstressanddeformationinthetunnelroofduringexcavation.Themodelsconsidervariousfactors,includingthestrengthoftherock,theorientationofthediscontinuities,andthelocationoftheexcavationface. ThesimulationresultsindicatethattheroofcollapseofthePalinetunnelwascausedbyacombinationoffactors,includinghighstressconcentration,weakrockmass,andunfavorablediscontinuityorientation.Thestudyalsorevealsthattheroofcollapsecouldhavebeenpreventedbyadoptingappropriateexcavationmethods,suchassystematicsupportinstallationandcontrolledblasting. Introduction Theexcavationoftunnelsisachallengingprocessthatrequirescarefulplanningandexecutiontoensurethestabilityofthetunnel.Oneofthemostcommonproblemsencounteredduringtunnelexcavationisthecollapseoftheroof,whichcanresultinsignificantfinancialandsafetyrisks.Thephenomenonofroofcollapseisacomplexprocessthatisinfluencedbyvariousfactors,includingthegeologicalconditions,thestressdistribution,andtheexcavationmethods.Inthisstudy,weinvestigatethecausesofroofcollapseintunnelsbyanalyzingtheeffectsofexcavationonthesurroundingrockmass. ThePalinetunnelinItalywasexcavatedusingadrill-and-blastmethod,anditencounteredsignificantroofcollapseproblemsduringtheconstructionprocess.Thetunnelwasexcavatedinaheterogenousgeologicalenvironment,whichposedsignificantchallengestothestabilityofthetunnel.Thestudyemploysfiniteelementmodelingtoinvestigateth