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复杂地质条件下地铁盾构施工要点分析.docx

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复杂地质条件下地铁盾构施工要点分析 Abstract Withthedevelopmentofurbanization,theconstructionofsubwayshasbecomeanimportantmeansoftransportation.However,complexgeologicalconditionsoftenleadtodifficultiesinsubwayshieldconstruction.Therefore,thispaperanalyzesthekeypointsofsubwayshieldconstructionundercomplexgeologicalconditions,aimingtoprovidereferencefortheconstructionofsubwayshieldinpracticalengineering. 1.Introduction Undercomplexgeologicalconditionssuchasfaults,water,softsoil,karst,andhighgroundwaterlevel,subwayshieldconstructionfacesvariouschallenges.Thispaperwillanalyzethekeypointsofsubwayshieldconstructioninthesecomplicatedgeologicalconditions. 2.TheKeyPointsofSubwayShieldConstructionunderDifferentGeologicalConditions 2.1Faultzone Faultzonesaregeologicalstructurespronetoinstabilityanddeformation,whichposeasignificantchallengetotheconstructionofsubwayshields.Whencrossingafaultzone,itisnecessarytoconsiderthedeformationanddisplacementoftheshield,thesealingofthetunnel,andtheprotectionofthesurroundingenvironment.Thekeypointsofsubwayshieldconstructioninafaultzoneareasfollows: (1)Real-timemonitoring:Real-timemonitoringmustbecarriedoutduringthewholeconstructionprocesstodetectthedeformationanddisplacementoftheshieldinatimelymanner,soastotimelyadjusttheconstructionplan. (2)Groundwatercontrol:Groundwatercontrolmeasuresshouldbetakentoreducethewaterpressureandpreventwatererosion,whichiscausedbyseepageinthefaultzone. (3)Shieldsealing:Itisnecessarytoensurethetightnessoftheshieldsoastoavoidsoilandwaterinflow. 2.2Water-richgeologicalconditions Highgroundwaterlevelandwater-richgeologicalconditionscanposeasignificantchallengetosubwayshieldconstruction.Thekeypointsofsubwayshieldconstructioninwater-richgeologicalconditionsareasfollows: (1)Groundwaterdrainage:Measuresshouldbetakentoreducegroundwaterinfiltration,suchaspumpingwells,grouting,anddrainage. (2)Controlofwaterinflow:Sealingmeasuresshouldbetakentopreventwaterinflow.Forexample,animperviouslayercanbesetupatthebottomofthetunnel,andawater-proofcoa