某盾构下穿北京地铁双线盾构区间结构变形分析与控制-研究

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1、万方数据ABSTRACTABSTRACT：Astherailtransitnetworkcontinuestoexpandandgroundbuildingsbecomemoreintensive．Someofthenewlyconstructedmelrolineswillcrossthemunicipalpipelinesandexistinglinesinevitably,especiallyprojectofshieldtunnelundercrossingtheexistingsubwayshieldsectioninshortverticaldista

2、ncewithgreatdifficultyandhighrequirement．Therefore，itisnecessarytocarryoutsystematicresearchofthedeformationlawoftheexistinglinesandthedynamicresponseoftrackstructureintheprojectofshieldtunnelundercrossingtheexistingsubwayshieldinterval，SOastooptimizeconstructioncontrolmeasuresinorder

3、toguaranteethesafetyoftheexistingsubwayoperation．Withtherapiddevelopmentofrailtransit,crossingprojectsareincreasing，thisresearchisinstructivetothedevelopmentofurbansubwayandundergroundengineering．Basedonwidelyliteraturereview,theprojectofashieldtunnelundercrossingtheexistingsubwaydoub

4、leshieldsectionistakenastheresearchobject,intheproject,theverticaldistancebetweenshieldtunnelandtheexistingsubwaysectionis6m(1．OD)andtheexsitingsubwayisintheshieldstronglyaffectedzone．Inadditiontheprojecthasthecharacteristicsofcomplicatedvariabilityofgeologicalconditionandprojectuncer

5、tainty．However,thesettlementoftheexistingsubwaystructureisonly0．98mmintheprocessofshieldcrossing．ThisisthefirsttypicalengineeringthattheshieldtunnelcrossestheexistingsubwayshieldsectionsuccessfullyintheBeijingarea．Themainresearchcontentsareasfollows：(1)UsefiniteelementsoRwareANSYStoes

6、tablishthree—dimensionalstratumstructuremodel，toanalyzetheinfluenceontheexistingsubwaysectioncrossedbyshieldconstructionbasedonthetheoryofcontinuousmedium．(2)Combinedwiththeactualconstructionsituation,throughtheanalysisofmonitoringdataintheconstructionprocessandcomparingwithsimulation

7、results,toverifytheaccuracyofsimulation,thentoconcludetheinfluenceregularityontheexistingsubwaycausedbysynchronousgroutingandsecondarygrouting．(3)Basedonthesuccessofcrossingprojectandcombinedwiththenumericalpredictionandanalysisofmonitoringdata,aswhileasthemanagementprocessofthecase，a

8、preli