超宽路堤附加应力分析及软土加固措施

《超宽路堤附加应力分析及软土加固措施》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、西南交通大学硕士学位论文超宽路堤附加应力分析及软土加固措施姓名：杜燕申请学位级别：硕士专业：地质工程指导教师：王鹰20081201西南交通大学硕士研究生学位论文第1I页明显；当L>80m，随路堤宽度的增加引起的中心线以下的沉降增量很小，几乎可不考虑。路堤宽度L<100m，最大沉降位于中心线处，沉降曲线大致为“抛物线”型；当L>lOOm最大沉降位移偏离中心线，向中心线两侧发展，沉降曲线呈不对称“马鞍’’型。关键词：超宽软土地基：多元复合地基；附加应力；应力分布：CFG桩西南交通大学硕士研究生学位论文第1II页AbstractWiththedevelopmentofhigh—speedrail

2、wayandrailwaylineforpassengertraffic，itrequiresmoreadvancedtechniqueonsettlementdeformationofsubgrade．SoftclayfoundationiswidelydistributedalongthecoastalregionofourCOUD．订y,inmanyprojectswhichareunderconstructionsuchasYong·Tai-Wen,WenzhoutoFuzhou，FuzhoutoXiamen,engineersapplypre—stressedconcretecu

3、bepile，theCFGpile(concrete-flash-gravelpile)ete，tothefoundationtreatment．Theuseofthesecompositefoundationsprovedtobegood．However,italsohaslimitation，forexample，hi曲costs．Multi—elementcompositefoundationisanewstylewhichcontainsanypilestyleassociatingwithdrainageconsolidation,rigid-flexiblepile，long-

4、shortpileandSOon．Inthecompositefoundation，theuseofreinforceCanbethesamelongth，orthelong—shortpilestyle．AndlongpilesandtheshortonesCanbemadewiththesamematerialorthedifferentones．Wecalleditmulti—elementcompositefoundationwhenthelong—shortpilesweremadewiththedifferentmaterials．Ituseslongpileanddraina

5、geconsolidationtocontrolthesettlementandtheflexible—shortpiletoimprovethebearingcapacityoffoundations．ItisnotwidelyusedintheMinistryofRailwaysasmoreasinhigh·risebuildingsandhighwayengineeringbecauseofthelowcos4andwerunshortofinformationofitsreinforcementmechanism,therefore，itwasnotusedabroadlyinhi

6、gh—speedrailwaysystem．Thestationis3kilometerslong，andtheheightoffillis7meters，thesoftsoilareaneededtobetreatedisabout2millionm2，andmostofthestructuresarebuiltinbadstratas．Accordingtothisproject，thedegreeof西南交通大学硕士研究生学位论文第1V页consolidationwascalculated,andtheresultsprovedthatitCallmatisfytherequirem

7、entofsettlementandtheconstructionperiodifweusetheplasticdrainslab．So，theCFGpileassociatedwithplasticdrainslab，pre-stressedconcretecubepileassociatedwithplasticdrainslab，CFGpileandpre—stressedconcretecubepilewithp