基坑开挖对下卧隧道影响的研究

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1、西南交通大学硕士学位论文基坑开挖对下卧隧道影响的研究姓名：师晓权申请学位级别：硕士专业：桥梁与隧道工程指导教师：杨其新20080501AbstractWiththedevelopmentofcity．itisanewproblemthattheinfluenceoffoundationexcavationonadjacentexistingtunnel．Consequently,howtopredictandcontrolthedisplacementandhowtoprotecttheexistingtunnelsbecometheimportantengineeringissue．

2、Applyingthetraditionaldesigntheory(strength—controllingdesign)androutineconstructiontechnology，thereisinevitabledifficultyaboutprotectingtheadjacentexistingtunnel．Thispaperanalyzedthedeformationfactorsandthedisplacementsandinnerforcesoftunnelsfromdifferentnumericalsimulationmodels．Finally,thestu

3、dyachievedeformationdisciplineoftunnelseffectedbyfoundationexcavation．Themaincontentsareasfclllows：l、Introducingtheconstitutiverelationsofsoilsandtheelasticityandelastoplasticmodelofsoils．Thendiscussingthemechanicalpropertiesofthesoilandfactorsoftheelasticdeformationoffoundationbottom．2、Analyzin

4、gthelongitudinaldeformationfactorsandtheoryofbeamonelasticfoundationoftunnel．Theorizedfortheafterstudying3、DiscussingdetailedlyabouttheknowledgeoffiniteelementmethodandtheapplicationofFEMsoftwareANSYS．4、Finally,UsingsoftwareANSYS，thepaperanalyzedtheinfluenceofthefoundationexcavationonadjacentexi

5、stingtunnelsthroughdifferentnumericalsimulationmodels(tunnelbesideandbelowfoundation1．Severalsimulatedfactorsaretakenintoaccountinthestudy．Including：thedifferentexcavationstep，depthoftunnelbelowgroundsurface，thedepthofdiaphragmwallsbelowthesoil，thethicknessofdiaphragmwallsandsoleplate，thereinfor

6、cementtothesoilinsidethepitandthereinforcementtothesoilnearthepit，andthecontrastbetweenplanarmodelandthethree—dimensionalmodel．Thedisplacementsofhorizonmlandverticalandinnerforcesalongthelongitudinalaxisoftunnelandtransectoftunnel．Paperachievedthedisplacementsandinnerforcesdisciplineoftunnelseff

7、ectedbyfoundationexcavation．Mainconclusionsweregetasfollows：(1)、Ifthedistancebetweenthefoundationandtunnelislargeenough，theinfluenceoffoundationexcavationonadjacentexistingtunnelshouldnotbeconsidered．(2)、Itisshouldnotalwaysi