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盾构隧道下穿河流引起的地层变形规律研究.docx

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盾构隧道下穿河流引起的地层变形规律研究 Title:StudyontheGroundDeformationMechanismCausedbyShieldTunnelingunderRiverCrossings Abstract: Withrapidurbanizationandinfrastructuraldevelopment,theconstructionoftunnelshasbecomeincreasinglycommon.Amongthevarioustypesoftunnelingmethods,shieldtunnelinghasgainedpopularityduetoitsadvantagesofminimizingsurfacedisruption.However,whenashieldtunnelpassesthroughariver,theinteractionbetweenthetunnellingprocessandtheriverbedsedimentscancausesignificantgrounddeformations.Thispaperaimstoinvestigatethegrounddeformationmechanismsinducedbyshieldtunnelingunderrivercrossingsandprovidesinsightsintoeffectivemitigationmeasures. 1.Introduction 1.1Background 1.2Objective 1.3Significance 2.Shieldtunnelingmethod 2.1Overview 2.2Advantagesanddisadvantages 2.3Applicationinrivercrossings 3.Grounddeformationmechanism 3.1Interactionbetweenshieldandsoil 3.2Effectsofwaterflow 3.3Influenceofriverbedsediments 3.4Factorsaffectinggrounddeformation 4.Casestudies 4.1Selectionofcasestudylocations 4.2Fieldinvestigation 4.3Monitoringanddataanalysis 4.4Grounddeformationpatterns 5.Mitigationmeasures 5.1Pre-constructionmeasures 5.2Constructionmeasures 5.3Post-constructionmeasures 6.Discussion 6.1Comparisonwithothertunnelingmethods 6.2Effectivenessofmitigationmeasures 6.3Implicationsforfuturetunnelingprojects 7.Conclusion 7.1Summaryoffindings 7.2Recommendationsforfutureresearch References 1.Introduction 1.1Background Ashumanpopulationscontinuetoconcentrateinurbanareas,thedemandforefficienttransportationnetworkshasincreased.Tunnelsplayacrucialroleinprovidingundergroundpassagesforroads,railways,andutilities.Amongthevarioustunnelingmethods,shieldtunnelinghasgainedpopularityduetoitsabilitytominimizesurfacedisruptions.However,whentunnelsareconstructedunderrivercrossings,theinteractionbetweenthetunnellingprocessandtheriverbedsedimentscancausesignificantgrounddeformations.Thesedeformationsmayhaveadverseeffectsonthestabilityofexistingstructuresandtheecologyoftheriver. 1.2Objective Theobjectiveofth