浅论大断面隧道浅埋暗挖法下穿既有地铁构筑物施工技术研究

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1、北京交通大学博士学位论文大断面隧道浅埋暗挖法下穿既有地铁构筑物施工技术研究姓名：姚海波申请学位级别：博士专业：岩土工程指导教师：王梦恕;张顶立20050601AbstractW“hlargesection，shallowoverbllrden，血esubwaystationtlmnelingunderamllningMetroproVestobeVerycomplicatedengineering．Theupperexistingmruleldemandsthatthecons订uctionofthesu

2、bwaystationhavetofocusonitsdisplacementsoastoascertainthenomalnlnningandpreventitfbmd啪agecausedbysenlementofsoilmass．Asystematiccontrollingprocessconsistingofexploring，forecasting．monitoringaJldengineeringmeasureswasputforward，inwhichthetotalsubsidencewas

3、dividedintoeverystepoftlleconsnuction．Throu曲contr曰llingtllevalueofsettlementcausedbyitsco“espondingstep，thetotalsemementstardardcouldbereached．Thedissertationincludesfollrmaintechnicalproblemscon疗omedincrossingtulllleIing：thedisplacementstyleandpossibled锄

4、agingmodel，constructionmet}lod，meworkingprincipleoflongleVelsteelpipeandtheconstructionadministmtioncontmlIingmethod．Thedetailsareasfollows：1．Basedonthemeas谢ngdataofthenmmngnlnneldufingconstmction，thedisplacelnemlawwass啪m撕zedaIldthedia铲amswas出awlLSeveralk

5、indsofpossibledamagings妙lesofnleexistingnnlnelwasanalyzedbymeansofmechanicsmodels．2，AnumberofconStructionmetllodinviewofla礓e-sectiOntunnelwereresearched．Thecharacteristicsofenviro砌eme仃ectswerecompared．Furtlleranalysesweremadeonkeyconstnlctionstepsofthemet

6、hodthatwouldbeadopt．3．Thebe嬲modelonelasticfomldationwasusedtosimulatethebehavioroflonglevelsteelpipeduringexcaVationonbasisofconsideringaUcons恤lctioncontentsindetail．Theequationsexpressingt11erelationbet、veenfactorswerefolmded．Atlastadesigningmethodoflong

7、leveIsteelpipebasedondenectioncontrollingwasputforward．4．Thedisplacement—diVidingprincipIcwasf引皿1ded，whichassociatedtheconstmctionstepsofmetrostationwittlthesettlementcontmloft11eexistingsubwaytLlIlneltightIya11deasilyopemted．Theproceedingrcsearchwor．Kbas

8、icaUymadeclearthemainaspectscoIlfbrltedincmssingtunneIingengineeringa11dcoⅡespond访gmeasures．Keywords：large-sectiontunnel，crossingtullllelingengincering，lOnglevelsteelpipedjgitalsimulation，廿ledisplacementdiVidingpmip