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地铁深基坑墙顶水平位移监测方法.docx

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地铁深基坑墙顶水平位移监测方法 Title:MonitoringMethodsforHorizontalDisplacementofSubwayDeepExcavationWallTop Abstract: Theconstructionofsubwaydeepexcavationsofteninvolvessignificantchallenges,suchasgroundmovement,whichcanposeriskstoadjacentstructures.Therefore,themonitoringofhorizontaldisplacementatthewalltopofdeepexcavationiscrucialforensuringsafety.Thispaperexploresvariousmonitoringmethodsformeasuringhorizontaldisplacementanddiscussestheiradvantagesandlimitations. Introduction: Deepexcavationsforsubwayconstructionofteninvolvetheexcavationoflarge-scalefoundationpitsinurbanenvironments.Theexcavationprocesscaninducegroundmovementsandaffectnearbystructures,posingpotentialrisks.Monitoringthehorizontaldisplacementatthewalltopallowsengineerstoassessthestabilityoftheexcavationandtakenecessarymeasurestopreventadversegeologicalincidents.Thispaperaimstoreviewandanalyzedifferentmonitoringmethodsforhorizontaldisplacementofsubwaydeepexcavationwalltops,helpingengineersselectappropriatetechniquesfortheirprojects. 1.ConventionalSurveyingTechniques: Conventionalsurveyingtechniquesinvolvetheuseoftheodolites,totalstations,andlevelinginstrumentstomeasurehorizontaldisplacement.Thesemethodsrequireprofessionalsurveyingskillsandcanbetime-consuming.However,theyprovideaccuratemeasurementsandaresuitableforsmall-scaleexcavationswithlimitedmonitoringpoints. 2.Extensometers: Extensometersarewidelyusedformonitoringhorizontaldisplacement.Theyconsistofdisplacementsensorsinstalledontheexcavationwallandareconnectedtoadataacquisitionsystem.Extensometersprovidereal-timemonitoringdataandarerelativelyeasytoinstallandoperate.However,theirmeasurementscanbeaffectedbyfactorssuchasinstrumentcalibrationandsurfacedeformations. 3.Inclinometers: Inclinometersmeasurethelateraldisplacementofthegroundbymonitoringthechangeininclinationofarodinsertedintheground.Theyarecommonlyusedindeepexcavationstomonitorwallmovement.Inclinometersprovidecontinuousmonitoringdataandaresuitableforlong-termprojects.However,theyrequiredrillingboreholes