双孔盾构隧道近接施工离心模型试验研究

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1、西南交通大学硕士学位论文双孔盾构隧道近接施工离心模型试验研究姓名：余峰申请学位级别：硕士专业：桥梁与隧道工程指导教师：蔺安林;仇文革20080601西南交通大学硕士研究生学位论文第ll页-_-l●_lI_●_l--●l-_--_-IIl_-●_I●I_lI●_-_I-l_-__●_I_I-_-__●l-●____l●l-lll_l-_-_lI_-●_l-●_●-ll-_●_●--___ll-I_l●_I-ABSTRACTTherapiddevelopmentofeconomyinChinaspeedsuptheprocess

2、ofurbanization,continuouslyexpandsthesizeofcities，populationdensi够inthecentreareaofbigcitiesandmegalopolis．Crowdedspace，trafficcongestion,slowpaceoftrafficformsaso—called”CitySyndrome”．Foralongtime，theexpansionofurbantransportation,infrastructureandcapacityofmajorc

3、itiesisbased01"1theexpansionofurbanlanduse,butgrowthinpopulationandlivingdemands，theshortageofurbanlanduse，hasbecomethefocusofcontradictions．Toachievethesustainabledevelopmentstrategy,inadditiontodevelopinhi曲-altitudearea,eyesarefocusedonthedevelopmentandutilizatio

4、nofundergroundspace,resultinginalargenumberofundergroundengineeringandapproachingconstructionoftunnels，whichwillinevitablycausecomplexrelationshipamongtheadjacenttunnels，puttingforwardstoanegativeimpactontunnelconstruction．Undergroundtunnelexcavationaremoresensitiv

5、eandvulnerabletodisturbance,whilethedesignandconstructionarealsoofnonormsorstandards，mechanicaltheoryofalltypesofapproachingexcavationconstructionsystemhasnotelaborated．AsaresulLthereinforcementandsafetymeasurearealwaysexcessivelystrict,basedonwhichtheconstructioni

6、sofmuchmoredifficulties．Onewayistoraisemanufacturingcostandislikelytowastemoney．Theotherwayistotakearisktoadaptblindcountermeasureandresultsinsafetyproblem．Asthescaleofcitycomtruetionincreasesandshieldmethodisusedcomprehensively,thestudyoninfluenceruleandcountermea

7、sureofapproachingexcavationofshieldtunnelareurgentaffairs．Herebystudyonapproachingexcavationofshieldisofurgentneeds．Thisdissertationproceedfourgroupsofcentrifugationmodeltestondifferentpositionofdoubleshieldtunnels，bymeasuringgroundsettlements，wallreekpressureandli

8、ninginternalforceofshieldtunnelindifferentconstructioncourse．Regularitiesofdistributionofgroundsettlements，wallrockpressureandlininginternalforce