土木工程外文翻译---在不良地质条件下的隧道掘进

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1、西南交通大学本科毕业设计第I页西南交通大学本科毕业设计外文翻译年级:学号:姓名:专业:指导老师:2012年6月西南交通大学本科毕业设计第10页TBMTUNNELLINGINDIFFICULTGROUNDCONDITIONGiovanniBarlaandSebastianoPelizzaABSTRACTThispaperistodiscussTBMtunnelingindifficultgroundconditions,whenproblemsaremetwhichmayreducedramaticallytheaverageprogressr

2、atesandpracticalconsequencesmaybesuchastoposeseriousquestionsontheuseofmechanizedTBMtunnellingversusdrillblastandotherso-calledtraditionalexcavationmethods.FollowingafewremarksonrockTBMtunnellinginrelationtotheselectionanddimensioningofthemachine,theattentionisposedonthelim

3、itinggeologicalconditionswhichmaybeenvisagedwithrespecttotheuseofTBMtunnellingandontheimportanceofgeologicalandgeotechnicalinvestigations,inordertoderiveanappropriateunderstandingoftherockmassconditionsalongthelineofthetunnel.Thediscussioniscenteredupontherelativelymoreimpo

4、rtantordifficultgroundconditionsincludingborabilitylimits,instabilityofexcavationwalls,instabilityofexcavationface,faultzonesandsqueezing.Wheneveravailabletotheauthorsandbasedonprojectexperience,thepointofviewisillustratedbycaseexamples,whichgivetheopportunitytounderlinespe

5、cificdifficultiesencounteredandrecommendations.INTRODUCTIONTBMexcavationrepresentabiginvestmentinanunflexiblebutpotentiallyveryfastmethodofexcavatingandsupportingarocktunnel(Barton,1996).Whenunfavorableconditionsareencounteredwithoutwarning,timescheduleandpracticalconsequen

6、cesareoftenfargreaterinaTBMdriventunnelthaninadrillandblasttunnel.Theunfavorableconditionscanbeproducedbyeitherarockmassofverypoorqualitycausinginstabilityofthetunnelorarockmassofveryquality(i.e.strongandmassiverockmass)determiningverylowpenetrationrates.However,itistobeobs

7、ervedthatwhenusingthefullfacemechanizedexcavationmethod,theinfluenceoftherockmassqualityonthemachineperformancehasnotanabsolutevalue:the西南交通大学本科毕业设计第10页influenceisinfacttobereferredtoboththeTBMtypeusedandthetunneldiameter.Rightfromthebeginningofitsearliestapplications,theus

8、eoffullfacemechanizedexcavationwastoovercomethelimitsimposedbylocalgeology,theecon