天津地下直径线大走私盾构穿越桥桩安全性分析

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1、ABSTRACTABSTRACTNowadays，inordertosolvetheurbantrafjfiCcongestionandinsufhcienturbanspace，subwayconstructionareconcentratingonworldwide，majorcitiesofChinainrecentyearshavecausedawave”subwaysandlightrails"constructionupsurge．Whilethecity’Selevatedandbridgesarecriss—cross，tunnelliningpilefoun

2、dationisunavoidable，thiswilleffectthesurroundingsoilsofbridgepile，causingadisturbancebridgepiledeformationanddisplacement，itisharmfulforthebridge’Snormaluseandsafetyproduce，subwayconstructionnearlymeetbridgefoundationconstructionnowhasbecomemoreandmoredifficultproblemsinengineering，Thesepro

3、blemsareurgentneedUStosolve．ThisthesisbasedonTianjin’Sundergrounddiameterlineengineering，selectingshieldthroughJingangBridgeasexamples，3dmodelisbuiltwithMidasGTSsoftware，Analysisitsconstructionprocess，thepile’SdisplacementanddeformationofthepilewhichunderNo．6andNo．7pilecaps．(1)Althoughwiths

4、hieldmethodandmechanicalproperties‘improvementshieldtechnologyhasrapiddevelopment，butitinevitablycauseformationoftheunderground，causestratadistortionandsurfacesettlement，especiallylargediameterofshieldtunnelinginsoRsoil，shieldstratadistortioncausedbytheconstructionofdeformationmechanism,the

5、maininfluencefactorsanddeformationlawandtoshieldtunneltonearlyconnecttheinfluencemechanismpileareexplainedinthispaper．(2)LargediameterofshieldthroughJingangBridgeinTianjinundergrounddiameterlineconstructionisacontrolpoints，tunnelandJingangBridgeNo．6andNo．7capsbearingthecrowdofpilefoundation

6、wasveryclose，theeffectoftheshieldconstructiontothemisverybig，accordingthepilefoundationof3-dnumericalsimulationofhorizontaldisplacementandverticalontheunevensettlementoflargediameterofshieldthroughJingangBridge，thispaperanalysisthesecurityofJingangBridge．Throughanalysiswefoundthataftershiel

7、dthroughJingangBridgetheJingangBridgedifferentialsettlementis15．583mm，didn’tsatisfiedthecontrolstandard，weneedtodotheirfoundationreinforcement．Wemustreinforcementit’Sfoundationtoensurethesafetyoftheconstruction．Thesixchapeteranalysisthisissuethroughthefi