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1、广州地铁复合地层盾构技术的探索和突破ExplorationandbreakthroughofshieldtechnologyincompositestratumofGuangzhouMetroXuShaohui,ZhuWeibin,YuanMinzheng1PrefaceInOctober1997,3setsofshieldmachineinGuangzhouMetroLineinGuangzhouwiththecompositeformationinthesuccessfulconstructionofasubwaytunnelattheendof8.9km,wheth
2、erintheurbanareaofGuangzhouusingthecompositeformationinshieldtunnelingconstructionofsubwaytunnelshieldinGuangzhoutodebate,theestablishmentoftheposition,andlaidthefoundationfortheconstructionofthesubwaytunnelafter1999Guangzhoumetrolinetwo,linethree,linefourgreatlyusingshieldtechnology.Sofa
3、r,metrotunnelshavebeenconstructedinGuangzhouusingshieldtunnelingmethodsatabout80km(seeTable1).Intheprocess,agreatdealoftechnicalproblemsaredealtwith,whichhasaccumulatedpreciousexperienceforshieldconstructionincompositestratum.2.TheconceptandcharacteristicsofcomplexstratainGuangzhouareaThe
4、mostimportantfeatureofcompositestratainGuangzhouareaisthatthelithologychangesfrequentlyintheengineeringscope,thephysicalandmechanicalcharacteristicsaredifferent,thebasementweatheringinterfaceislargeandthefracturefracturezoneisdenselydistributed,andthewatercontentdifferenceisobvious.Specif
5、icperformance:thesamemileageperformanceforthetunnelcrosssectionverticallyorhorizontallynon-uniform,inthelongitudinalprofileontheperformanceofhardandsoftwhite,thecompositecharacteristicsoftunnelsectionformation,especiallytheinfluenceonshieldconstruction.Theburieddepthofshieldtunnelisgenera
6、llyfroml0to30m,andthetunnelsectionandoverlyingstrataaresuccessivelyfromgroundsurfacetobottom:Upperpart:Quaternarysoftsoillayerismainlycomposedofmiscellaneousfill,flowingplasticsoftplasticsiltlayerandrichwatersandlayer.ThemiddlelayeristheQuaternaryeluvial,sedimentaryrocks,metamorphicrocks,
7、magmatiteandotherthreelargerockweatheringresidualformation,plastic,hardplastictosemi-solidstateclayandsandy,gravellyclayeysoil.ThelowerpartofmostareaiscomposedofdifferentweatheringdegreesofCretaceousconglomerate,sandstone,siltstone,mudstoneandsmallmarl;fewarecompose
