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1、北京交通大學(xué)碩士學(xué)位論文京津城際軌道交通北京試驗段組合樁復(fù)合地基沉降特性研究姓名：陳菲申請學(xué)位級別：碩士專業(yè)：地質(zhì)工程指導(dǎo)教師：王連俊20081101北京交通大學(xué)碩士學(xué)位論文ABSTRACTABSTRACT：Beijing-Tianjininter-cityrailtrafficwasthefirstpassengerlineopenedinChinainwhichthetechnologyofballastlesstrackandCFG-pilecompositefoundationwereapplied．Thepost-constructionsettlementshould
2、beeontroledwithin25mm．BasingonthegapofCFG-pilecompositefoundationappliedinhigllrailway,settlementcharactersofcompositefoundationwasstudiedbetweenBeijingtestsection，whichreliedonthesubject--studyonsubgradesettlementcontrolmeasuresanddeformationobservationtechnologyinpassengerline．Then，theeffec
3、tofCFG-pilecompositefoundationappiledinBeijingsectionWasevaluated，bycomparingpile-soilstressandsettlementdifferencesindifferentlocation；atthesametime，thefactorswhichaffectsettlementcharactersandpile-soilstresswereresearchedandareasonabledesignparametersweremade．Thefactorstheyarethelength、pile
4、pitch、modulusandthicknessofcushion．Basedontheabovestudy,someconslusionsarebelow：1、MostoftheloadWasbearedbypile，butduringtheprocessofpreloading．Someloadwastransferredfrompiletosoil；ultra-porewaterpressurecausedWaslittleintheregion；thesettlementWasthelargestduringthepreloadinganditWaslittleafte
5、rtheloadremoved．2、ThesettlementcharactersofCFG-pilecompositefoundationcausedbysubgradeloadwereinvertedbell—shaped；thesurfacesettlementWasthelargestatthe．roadbedcenterline；withthedistancefromtheroadbedcenterincreaseing,settlementreducedgradually；thereWaslittlegroundupliftclosetotheborderregion
6、．3、Toacertainlength，therelationshipberweensettlementandpile-lengthisinverseratio；thelongerlength，thegreaterpile-soilstressratioandtheroleofpile；thelargerdistencebetweenpile．thelargesettlementandpile—soilstress；Withcushionmodulusincreased，thesettlementreducedslightly；butthepile—soilstressratio
7、increase，theimpactofcushionthicknessonthesettlementisnotsignificant，butthepile—soilstressratioisnoticeablyaffectedbythecushionthickness．KEYWORDS：Jing-Jininter-cityrailway；CFG—pilecompositefoundation；SettlementCharacters；Pile·soilsressratio；Nu
