大断面隧道CD法施工围岩应力行为研究

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1、西南交通大学硕士学位论文大断面隧道CD法施工围岩应力行为研究姓名：张新亮申请学位级别：硕士专业：桥梁与隧道工程指导教师：杨其新20080501西南交通大学硕士研究生学位论文第1I页AbstractWiththedevelopmentoftrafficconstructionofourcountry,thelarge—sectiontunnelandundergroundprojectsincreasesgradually,andtheconstructiontechnologyofthelarge-sectiontunnelshasbeeng

2、reatlydeveloped．Comparewithtunnelswhichwerebuiltbefore，newrequestfortheconstructionofthelarge—sectiontunnelsappearsintheformofcrosssections，liningstructures，constructiontechnology，primarysupportstructuremodelsandparameters，etc．Althoughatthecurrenttimethereisalotofcomputatio

3、ncasesofthelarge—sectiontunnels，mostofthemlackofgeneralandsystemicresearchespeciallyintheanalysisofinfluenceofconstructiontechnologytotunnelstressbythesimplificationofparametersandsimulation．Currentlyinconstructionstageofthelarge-sectiontunnels，theexcavationwasmostlyseparat

4、eintosomecrosssections．BytheinfluenceofexcavationordersthesurroundingrockstressdistributionwillbeunbalancedaftertheexcavationofthetunnelCROSS．Aimsattheproblemofunbalancedsurroundingrockstressdistributionafterexcavation，thisthesisusedtheANSYSsoftwaretoresearchthemaincontents

5、shownasbelow：1．Fournormalformsofthetunnelcrosssectionwereselectedastheresearchsubjectsbythecomparisonofcrosssectionformsoflarge-sectioninChina，andthedesignprincipleswerepromotedtodirectthecrosssectiondesignfromthemechanicsaspect；2．Theinfluenceofgeologyparameterstotunnelstea

6、dinessweresummarizedbasedontheanalysisofsteadinessofdifferentsymmetrysitesofsurroundingrockaftertheexcavationofthelarge—sectiontunnelswhichusedtheCDmethod．3．Duringtheconstructionstageofthelarge-sectiontunnels，theconditionofdifferentgeologyparametersatthesiteofsamecrosssecti

7、onwillalwaysexist．CombinedwiththeconstructionprocessofCDmethod，thestabilitycoefficientKvalueswerecomparedtoresearchandsummarizethestressregulationofdifferentsiteofsurroundingrocksduringtheexcavationandafter-excavationstages．4．Aimattheproblemofunbalancedsurroundingrockstress

8、distribution西南交通大学硕士研究生学位论文第1II页duringtheconstructionoflarge—sectiontunnels，thesur