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ID:36434359
大小:5.60 MB
页数:63页
时间:2019-05-10
《京津城际轨道交通北京试验段组合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组合桩复合地基沉降特性研究姓名:陈菲申请学位级别:硕士专业:地质工程指导教师:王连俊20081101北京交通大学硕士学位论文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
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