欢迎来到天天文库
浏览记录
ID:36389422
大小:10.39 MB
页数:54页
时间:2019-05-10
《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
此文档下载收益归作者所有