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ID:33100606
大小:7.50 MB
页数:81页
时间:2019-02-20
《砂卵石地层交叉重叠隧道盾构施工结构与环境控制分析-(6064)》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、西南交通大学硕士研究生学位论文第1I页AbstractThecharacterofsandycobblestratumofChengduis,loosenstructureandpoorstability,richincobblecontentandbigsizegrain,nonuniformindistributionandrandominfillingoflenssand.ThismakesthesandycobblestratumofChengduparticularandcauseslotsofc
2、onstructiontechniques.ThebothtunnelsofMetroLine2intercrossunderneaththeBaicaoRoad.overlapswitheachother,makesstronginfluencebetweeneachother,andgreatdifficultyincontrollingthetunnelingconstruction.Inaddition,theprojectenvironmentaroundthemetrolineiscomplic
3、ated,withlotsofbuildingsandundergroundpipelines,andneedsverystrictenvironmentalprotectionrequirements.Improvingtheshieldtunnelingefficiencyoftheoverlappedtunnelsofthesandycobblestratum,finishingtheconstructionsafelyandrapidly,canoffersuccessfulexperiencest
4、othesimilarconstructioninthefuture.Withtheseproblems,thisthesisisbasedontheconstructionofMetroLine2ofChengdu,thefollowingresearchingworkiscompleted:1.Accordingtothespecificityofthesandycobblestratum,optimizetheconstructioncontroloftheoverlappedtunnels.Theh
5、oleeffectandthelaggedgroundcollapsebehaviorareanalyzed,combinedwiththestrainandstressstateofparalleltunnelsandoverlappedtunnels,discussedtheimprovementandtheoptimizationoftheshieldconstruction,thecontrolofthetunnelingparametersfromtheaspectoftheearthpressu
6、rebalanceoftheexcavationface,thecompositionofthesubsidenceoftheground,andthegroutingandreinforcementmeasures.2.Studythewholeshieldtunnelingconstructionmechanicsbythenumericalsimulation,accordingtothecomparisonwithdifferenttunnelingsequences,analysistherati
7、onalityofthe“downtoupper”tunnelingsequence,thestress-straincharacteristicsofthetunnelstructureandthegroundintheconditionofbuildthetunnelbysequence,theinfluenceofbothtunnelsduringtunnelingbycomparisonofdifferentlocation,theholeeffectandthelaggedgroundcollap
8、sebehaviorisalsosimulated.Themainconclusionsare:thedisturbanceeffectisformedafterthedowntunnelexcavated,whichmakesthesurroundingoftheuppertunnelloose,itsstabilityweaken.Theloosensurroundingiseasytolosestabili
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