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时间:2019-06-24
《The “Cut-and-Cover” and “Coverand-Cut” Techniques in Highway Engineering英文资料》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、The“Cut-and-Cover”and“Cover-and-Cut”TechniquesinHighwayEngineeringA.MouratidisProfessorofHighwayEngineering,AristotleUniversityofThessalonikiEmail:tasos@hermes.civil.auth.grABSTRACTThe“CutandCover”and“CoverandCut”methodsareadvancedengineeringtechnique
2、sfortunnelconstructioninurbanandinterurbanareas.Initiallymeantforsubwaytunneling,the“CutandCover”methodhasbeenlatelyadoptedinmotorwayprojectstodealwithsmall-depthroadtunnelsandlocalenvironmentalconstraints.Themainconceptofthemethodconsistsoffull-lengt
3、horsequentialexcavationalongtheroadsegmentandsubsequentconstructionofthetunnelbore.Followingdrainageandwaterproofingmeasures,backfillingrequiresawell-monitoredconstructionprocess,adequatelydefinedintermsofequipmentandqualitycontrol.Environmentalissues
4、,suchasplantingandseeding,constitutethefinalstage,complemented,eventually,byreconstructionofthesecondaryroadnetworkupslope.The“CoverandCut”methodfortunnelconstructionwasoriginallydevelopedforurbansubwaystructureswheretheleastpossibledisruptionoftraffi
5、cisrequired.Inmotorwayconstructionprojects,roaddesignersprescribethemethodforundergroundstructurestoefficientlyfacemajorissuesofinstability.Atafirststage,ashallowexcavationandgradingisperformed,followedbytheconstructionofasub-soilconcrete“vault”.Thisv
6、aultactingasaretainingstructureprovidesfullprotectiontothemainexcavationactivitiesbelowcarriedoutbyconventionaldrillingandhaulingequipment.Thetunnelboreconstructionconstitutesthefinalstageofthetechnique.Inthispaper,anoverviewofbothmethodsispresentedil
7、lustratingmainfeatures,advantagesandfieldofapplication.Relevantenvironmentalandgeotechnicalissuesaredisplayedandfundamentalelementsofthedesignprocessareaddressed.Representativesketchesoftheconstructionstagearegivenaswellasanoutlineofanumberofcasestudi
8、esinmajormotorwayconstructionprojects.GENERALLAYOUTThe“cutandcover”andthe“coverandcut”aretwotechniquesfortunnelconstructioninhighwayengineering.The“CutandCover”methodhasbeenusedforalongtimeinurbansubwayconstructionbutalsoininterurbantransporta
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