大跨浅埋隧道施工时空效应研究

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1、西南交通大学硕士学位论文大跨浅埋隧道施工时空效应研究姓名：王伟峰申请学位级别：硕士专业：桥梁与隧道工程指导教师：周晓军20080501ABSTRACTWiththemoderntransportationrapiddevelopment，tunnelconstructionquantityincreasesdaybyday．mycountryhavemanymountains，especiallyinwesternregions．Inthedesignandconstructionofthetunne

2、l，softrockappearsfrequently，rheologyistheintrinsiccharacteristicofthesoftrock．Fortherheologicalphenomenaexistinvarioussoftrockprojects，theinfluenceofrheologicalphenomenahasbeenrecognizedbymanypeople，Iftherheologicalcharacteristicsofsurroundingrockaretak

3、enintoaccount，theorymustbemoreconsistentwithpractice，thishasgreatpracticalsignificance．Inthispaper，temporalandspatialeffectinconstructionoflargespanandshallow-buriedturmelisstudiedpreliminarilyandsomeusefulconclusionsaregot．RheologicalmodeltheoryiSintro

4、ducedatfirst．thecharacteristicofcombinationmodelissummarized．ThencharacteristicsandsolvingthoughtsofFLAC3dareanalyzed，descriptionofCvisccreepconstitutivemodelandmethodsofsolvingcreepproblemareintroduced．FinallythepapertakentheJiangXiangGoutunnelasthepro

5、jectbackground，choosedtheidealelastoplasticitymodel，simulatedtheeffectofexcavationfacebyLagrangemethod，studiedthedeformationofsurroundingrockwiththeprocessoftunnelexcavation，forthelargespanandshallow-buffedtunnel，underthebenchingtunnelconstructionmethod

6、，theexcavationfaceplaysthehypothesizedsupportrole．itsareaofeffectapartfromthefaceisabouttwotimesofholediameter，thearchsettlementismainlyinfluencedbyupperbenchcutting．thelowerbenchcuttingmakesthelateralmovementofthemiddlewallincreasequickly,andlittleeffe

7、ctonthearchsettlement,withthedistanceapartfromexcavationfaceincreasing，thespatialeffectgraduallyweakened，thedeformationofsurroundingrocktendstobestable．Sincethesurroundingrocktakessignificanttime-varyingeffects，andthemechanicalresponseofthetunneliSclose

8、lyrelatedtotheprocessofconstruction，SOthepaperchoosedtheH—Kbodyrheologymodel，studiedtherheologicalcharacteristicsintheconstructionprocessofthelargespanandshallow-buriedtunnel，afteranalyzingthecomputedresults，nearbytheexcavationfa