地铁盾构隧道下穿既有铁路沉降分析与控制分析-(5567)

《地铁盾构隧道下穿既有铁路沉降分析与控制分析-(5567)》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、万方数据北京交通大学硕士学位论文ABSTRACTABSTRACTWiththehigh—speeddevelopmentofsubwayconstruction，therearcmoreandmoreprojectsofsubwaytunnelingundertherailways．nlesubwayconstructionwilldisturbthesurroundingstrata,resultinginthesettlementanddifferentialsettlementofexistingrailwaysubgrade，

2、whichisnotconducivetothesafeoperationoftherailway．Therefore，theresearchofrailwaysubgradesettlementdeformationlawduringthesubwayconstructionandthecontroleffectofstratumreinforcementmeasurestosubgradesettlementaresignificant．Inaddition，theconventionalnumericalsimulationme

3、thodofshieldconstructionseldomconsiderthefrictionalandshearingeffectonsurroundingsoilduringshieldtunnelconstruction，whichisoncoftheimportantfeaturesoftheshieldmethoddifferentfromtheothers．Therefore，howtoconsideringtheeffectofshieldfrictiononthegrounddeformationintheproc

4、essofshieldconstructionnumericalsimulatingisaproblemworthyofstudy．Inthispaper,takingBeijingmetroline14CaihuyingStationtoXitieyingstationintervaltunnelingundertheBeijingKowloonCantonRailwayandLiuguangRailwaypremiumrisksourceastheengineeringbackground．Throughnumericalsimu

5、lationwithF“Pu，researchthesettlementlawofsubgradeduringthewholeconstructionprocessofShieldtunnellingunderthesubgradcandanalysistheeffectofreinforcementmeasuresoncontrollingthesubgradesettlement．Inthemeantime，theconventionalnumericalsimulationofshieldconstructionmethodha

6、sbeenimprovedbyusingthegeogridSELsbuilt—in删C3D．SOaStosimulatetheeffectofshieldfrictiononthegrounddeformation．Duringtheshieldtunnelingprocess．nlemainresearchachicvementsareasfollows：(1)Undertheinfluenceofshieldfriction，thesoilaroundtheshieldproducedobviouslongitudinaldis

7、placementfield；nesurfaceheaveinfrontoftheshieldandthesettlementbehindtheshieldareobviouslyincreasedcomparedwiththecircumstancewithoutshieldfriction；Thedistributionofdisplacementfield，stressfieldandstrainfieldofthesoilaroundtheshieldismoreinlinewiththeexpectedmechanicalb

8、ehaviorcomparedwiththecircumstancewithoutshieldfriction．(2)‘Ikshieldexcavationprocessaccompaniedbytheexpansion