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1、密級：公開地鐵施工中的樁基托換技術(shù)研究StudyonPileFoundationUnderpinningTechniquesinSubwayConstructiOn(申請石家莊鐵道學(xué)院授予[學(xué)碩士學(xué)位論文)培養(yǎng)單位專業(yè)研究生指導(dǎo)教師土木工程分院橋梁與隧道工程畢經(jīng)東朱永全教授二oo七年一月AbstractWiththedevelopmentofthecities’construction，thegroundtrafficbecomestoomuchheavy．Manycitieschoosetobuil
2、dSubwaywhichisconvenientandefficienttoalleviatethetrafficpressureontheground．Undercuttingmethodbecomesthemainwaytobuildsubwayinmostcities，becauseofitslittleinfluencetothegroundtrafficanditswidelyapplication．Sometunnelsareinevitabletogothroughthefoundati
3、onsoftheconstructionontheground，andthefoundationswhichenterintothetunnelmustbetmderpinned．Manybuildingsaresupportedbypilefoundations．Therefore，itisofgreatimportancetOstudythedisplacementoftheoldfoundationandthemechanicbehaviorofthetunnel’Slininginpilefo
4、undationunderpinning．Firstly,theauthorsummarizedthetypemadthecharacteristicofthefoundationunderpinningmethodswhichpartlygothroughtheconstructioninopen—cutsubwayandgothroughtheconstructionintotalinundercuttingsubway,andtheFEMtheoryisintroducedsimplyinthi
5、sdissertation．Next，basedontheTiantanEast—stationofBeringNo．5Subwaywhichgoesthroughthepilefoundationofthe109t11highschool’Spassengerfootbridge，theunderpinningschemethatthenewlybuiltpileandtheoldpilesupportingtheupperloadisconstituted，andintheschemetrunca
6、tingthepileinthetunnelisalsodeterrnined．ThentheconstructionprocessisimitatedwithFEMsoftware．Atlast，itisprovedthatthisunderpinningschemeisrationalandfeasiblebythecomparisonoftheimitationresultandtheactualmeasuredresultAndthen，basedonthelefttunnelofPuTian
7、ofBeijingsubwaywhichgoesthroughthepilefoundationoftheSouthMoat，inthecaseoflackingtheconditiontoactualizepilefoundationunderpinningontheground，theunderpinningschemeinthetunnelisconstitutedfirstly．Thisschemeisactualizedbyaddingthetunnel’Ssupportsandsevera
8、lnewtechniquessuchasthefollowings：insertingreinforcedbars，shellingpiles，liningarch，truncatingpilesandsecondaryliningarch．Thenthetunnelsupportandliningarchesbecomethenewfoundationoftheoldpile．Inthefollowingstudy,Absttacttheconstru
