上下近接既有构筑物隧道悬臂掘进机施工技术研究.docx

上下近接既有构筑物隧道悬臂掘进机施工技术研究
Title:ResearchonConstructionTechnologyofTunnelCantileverTBMforAdjacentExistingStructures
Introduction:
Tunnelconstructioninurbanareasoftenencountersthechallengeofinteractingwithadjacentexistingstructures.Theproximityofthesestructuresmayimposerestrictionsontraditionalexcavationmethods,leadingtothedevelopmentofadvancedconstructiontechniquessuchasTunnelBoringMachine(TBM)cantileverexcavation.ThispaperaimstoinvestigatetheconstructiontechnologyoftunnelcantileverTBMforadjacentexistingstructures.
1.OverviewofTBMCantileverExcavation:
1.1DefinitionandPrinciple:
TBMcantileverexcavationreferstothemethodofusingaTBMtoexcavateatunnelwithoutrequiringfull-facecontactwiththesurroundingsoil.Instead,theTBMisanchoredtoapreviouslyconstructedtunnelorotherstructuralelements,allowingforsafeandefficientexcavation.
1.2AdvantagesandLimitations:
TBMcantileverexcavationoffersseveraladvantages,includingreducedgroundsettlement,lowerriskofdamagetoadjacentstructures,andfasterconstructionspeed.However,italsohaslimitations,suchastheinabilitytohandlecertaingeologicalconditionsandlimitedflexibilityinchangingexcavationdirections.
2.InteractionAnalysisandCalculation:
2.1StructuralAnalysis:
TheinteractionbetweenacantileverTBMandadjacentstructuresiscrucialforensuringsafetyduringconstruction.StructuralanalysisshouldbeconductedtoevaluatetheforcesanddeformationsinducedbyTBMexcavationandtheeffectonexistingstructures.
2.2CalculationofDeformationandSettlement:
FiniteelementanalysisandanalyticalmethodscanbeemployedtoestimatethedeformationandsettlementcausedbyTBMexcavation.Factorssuchasgroundconditions,TBMparameters,andconstructionsequencesshouldbeconsideredinthecalculationprocess.
3.SupportMeasures:
3.1Pre-constructionMeasures:
PriortoTBMcantileverexcavation,pre-constructionmeasuresshouldbetakentoenhancethestabilityofadjacentstructures.Thismayincludeinstallinggroundreinforcementsystems,grouting,orconstructionofretainingwalls.
3.2In-constructionSupport:
DuringTBMcantileverexcavation,supportme