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时间:2019-05-22
《双向八车道连拱隧道施工方案优化分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第28卷第1期岩石力学与工程学报Vol.28No.12009年1月ChineseJournalofRockMechanicsandEngineeringJan.,2009双向八车道连拱隧道施工方案优化分析1,21,21,2许崇帮,夏才初,朱合华(1.同济大学地下建筑与工程系上海200092;2.同济大学岩土及地下工程教育部重点实验室,上海200092)摘要:利用有限元计算法对双向八车道连拱隧道IV,V级围岩的2种施工方法(双侧壁导坑和CRD法)进行模拟。计算和比较这2种施工方法下围岩应力和位移控制效果,结果表明,双侧壁导坑法可以更好地发挥围岩自身承载能力和
2、初期衬砌支护作用,有利于提高二次衬砌的安全储备;CRD法对隧道两侧边墙水平位移控制比较有利,但对隧道顶部围岩沉降控制不如双侧壁导坑法有效。从总体上分析结果可知,双侧壁导坑法更适合于双向八车道连拱隧道施工。关键词:隧道工程;连拱隧道;施工力学;应力控制;位移控制;数值模拟中图分类号:U45文献标识码:A文章编号:1000–6915(2009)01–0066–08OPTIMUMANALYSISOFCONSTRUCTIONSCHEMEOFMULTI-ARCHTUNNELWITHEIGHTTRAFFICLANES1,21,21,2XUChongbang,XIACa
3、ichu,ZHUHehua(1.DepartmentofGeotechnicalEngineering,TongjiUniversity,Shanghai200092,China;2.KeyLaboratoryofGeotechnicalandUndergroundEngineeringofMinistryofEducation,TongjiUniversity,Shanghai200092,China)Abstract:Byfiniteelementmethod,thecoursesofdynamicconstructionofmultiple-arch
4、tunnelswitheighttrafficlanesandsurroundingrocksofclassIVandVaresimulated;theexcavationeffectsoftwoconstructionmethods,whicharethedouble-side-driftmethodandtheCRDmethod,arecomparedbasedonthedisplacementsofsurroundingrockmassandpreliminaryliningandthesecondlining.Throughcomparingthe
5、numericalcalculationresultsofstressesanddisplacementsinsurroundingrock,itcanbeconcludedthatthedouble-side-driftmethodhasadvantagesincouplingthesurroundingrockandthepreliminaryliningintofullplayofsupportingthetunnel,whichwillbenefitthesecondliningwithcertainsafetymargin.TheCRDmetho
6、disofadvantagesinhorizontaldisplacementcontrol,butitisnotaseffectiveasthedouble-side-driftmethodinverticaldisplacementcontrolatthetunneltopaccordingtothenumericalcalculationofmultiple-archtunnelwitheighttrafficlanes.Itcanbeconcludedthatfromoverallanalysis,thedouble-side-driftmetho
7、dismoresuitablethantheCRDmethodinmultiple-archtunnelwitheighttrafficlanes.Keywords:tunnellingengineering;multiple-archtunnel;constructionmechanics;stresscontrol;displacementcontrol;numericalsimulation六车道隧道相比,隧道结构、施工环境和施工组织1引言[1]更加复杂,建设中还存在大量工程技术问题。其中,如何选择合理、最优的施工方法来最大程度地双向八车道连拱公路隧
8、道与其他双向四车道、降低隧道施工对隧道围岩扰动破坏的影响和对周边收
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