京津城际轨道交通北京试验段CFG桩复合地基沉降特性研究

《京津城际轨道交通北京试验段CFG桩复合地基沉降特性研究》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、北京交通大学硕士学位论文京津城际轨道交通北京试验段CFG桩复合地基沉降特性研究姓名：魏瑞城申请学位级别：硕士专业：地质工程指导教师：王连俊20080501ABSTRACTABSTRACT：Beijing··Tianjininter··cityrailtrafficwasthefirstpassengerlineopenedinChinainwhichthetechnologyofballastlesstrackandCFG-pilecompositefoundationwereapplied．Thepost—constructionsettlementshouldbe

2、controledwithin25mm．BasingonthegapofCFG-pilecompositefoundationappliedinhighrailway,settlementcharactersofcomposite．foundationwasstudiedbetweenBeijingtestsection，whichreliedonthesubject--studyonsubgradesettlementcontrolmeasuresanddeformationobservationtechnologyinpassengerline．Then，thee

3、ffectofCFG—pilecompositefoundationappiledinBeijingsectionwasevaluated，bycomparingpile-soilstressandsettlementdifferencesindifferentlocation；atthesametime，thefactorswhichaffectsettlementcharactersandpile-soilstresswereresearchedandareasonabledesignparametersweremade．Thefactorstheyarethel

4、ength、pilepitch、modulusandthicknessofcushion．Basedontheabovestudy，someconslusionsalebelow：1、Mostoftheloadwasbearedbypile，butduringtheprocessofpreloading．SomeloadWastransferredfrompiletosoil；ultra-porewaterpressurecausedwaslittleintheregion；thesettlementwasthelargestduringthepreloadingan

5、ditwaslittleaftertheloadremoved．2、ThesettlementcharactersofCFG-pilecompositefoundationcausedbysubgradeloadwereinvertedbell—shaped；thesurfacesettlementwasthelargestattheroadbedcenterline；withthedistancefromtheroadbedcenterincreaseing，settlementreducedgradually；therewaslittlegroundupliftc

6、losetotheborderregion．3、Toacertainlength，therelationshipberweensettlementandpile-lengthisinverseratio；thelongerlength，thegreaterpile-soilstressratioandtheroleofpile；thelargerdistencebetweenpile．thelargesettlementandpile-soilstress；Withcushionmodulusincreased，thesettlementreducedslightly

7、；butthepile-soilstressratioincrease，theimpactofcushionthicknessonthesettlementisnotsignificant，butthepile-soilstressratioisnoticeablyaffectedbythecushionthickness．KEYWORDS：Jing--Jininter-cityrailway；CFG-·pilecompositefoundation；SettlementCharacters；Pile—soilsressratio；Numerical