三线铁路大跨度隧道围岩力学响应研究

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1、西南交通大学硕士学位论文三线铁路大跨度隧道围岩力学响应研究姓名：徐怀仁申请学位级别：硕士专业：防灾减灾工程及防护工程指导教师：高波20070401西南交通大学硕士研究生学位论文第

2、l页AbstractWiththeconstructionofhigh—speedrailwayinourcountry,thenumberofthelarge—spantunnelwillincreasegradually．TheNATM(newAustriantunnelingmethod)isappliedindesignandconstructionofthe

3、large—spantunnelthatwiltbedevelopedandaffirmed．Surroundingrockisthemajorbearingzoneofthetunnel．It’Sveryimportantthatanalyzingmechanicalresponseofthesurroundingrockwiththeconstructiondynamicprocess．Inparticular,studyingtheshapeandstabilityofbearingzoneinthatprocessisbeneficia

4、ltoreasonablydesignandsafelyconstruct．BasedonthebasicprintiplleofrockmechanicsandtheoryoftheNATM，thisthesisbuildsa3DmodelthataccordswithHeLuoshunthree·lanerailwaytunnelinDaLi··LiJiangrailwayandsimulatestheconstructionofthelarge··spantunnelusingdoublesideexcavationmethodbyela

5、stic-plasticFEManalysis．Thethesisreachessomeusefulconclusionsthat：Usingtheelastic-plastictheoryandstresstensortool，surroundingrockisclassifiedtofourzones(undisturbedzone、elasticrelaxationzone、bearingzone、plasticrelaxationzone)byitsstressstatus．Thesezonesandadjacentborder’Slo

6、gicalformulationsareconcludedfordifferentiatinginthecomputerprocessanddesigningprimarysupport．Usingdatapathwhichcontainsstressstatus，surroundingrockofthelarge—spantunnelisanalyzedbystresstensorandthosezonesareidentifiedbystressconcentrationinkeypositionwitlltheconstructiondy

7、namicprocess．Usingstressratiowhichisdefinedbyeffectivestressdividedfieldstress，surroundingrock’Sstrengthincreasingzoneofthelarge·spantunnelareidentifiedinkeypositionwiththeconstructiondynamicprocess．Usingplasticworktheory,surroundingrock’plasticzoneofthelarge—spantunnelareid

8、entifiedinkeypositionwiththeconstructiondynamicprocess．Keywords：Tunnelengineering；large—span；constructionmechanics；numericalsimulation；stresstensor；bearingzone西南交通大学硕士研究生学位论文第1页第1章绪论1．1研究背景及必要性2004年1月，国务院审议通过我国铁路史上第一个《中长期铁路网规划》，确定到2020年全国铁路营业里程达10万公里，其中客运专线1．2万公里。这意味着我国铁路网不仅

9、规模空前扩大，而且标准和水平有质的飞跃。我国铁路将实现跨越式发展，大规模铁路建设己经全面展开。为加快实施规划，近两年来新建铁路规模10500公里、改建