管樁水泥土復合樁荷載傳遞規(guī)律研究

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1、第33卷增1巖石力學與工程學報Vol.33Supp.12014年1月ChineseJournalofRockMechanicsandEngineeringJan.，2014管樁水泥土復合樁荷載傳遞規(guī)律研究李俊才1，張永剛1，鄧亞光2，華小龍1(1.南京工業(yè)大學交通學院，江蘇南京210009；2.江蘇如東水利電力建筑有限公司，江蘇南通226400)摘要：管樁水泥土復合樁是一種新樁型，可用于軟土地基處理。為研究其荷載傳遞規(guī)律，采用現(xiàn)場荷載試驗、樁身光纖光柵應力測試及數(shù)值模擬，分析各級荷載下管樁及水泥土樁身軸力、樁側(cè)摩阻力及樁端阻力分布特征。研究管樁、水泥土有效復合變

2、形協(xié)調(diào)條件及各自荷載承擔比例；給出各段壓縮量隨樁頂荷載的變化規(guī)律；比較該樁型區(qū)別于一般管樁的沉降、抗力特點。研究表明：復合樁Q-s曲線呈緩變型；管樁是上部荷載的主要承擔者，其工作特性與剛性單樁相似；樁端阻力占樁頂荷載比例較小，復合樁表現(xiàn)出摩擦樁的工作特性；管樁和水泥土側(cè)摩阻力分布規(guī)律相似，其比值約為水泥土和管樁外徑的比值。關鍵詞：樁基礎；光纖布拉格光柵；荷載傳遞規(guī)律；現(xiàn)場試驗；數(shù)值模擬中圖分類號：TU473.1文獻標識碼：A文章編號：1000–6915(2014)增1–3068–09LOADTRANSFERMECHANISMOFCOMPOSITEPILECOMP

3、OSEDOFJET-MIXINGCEMENTANDPHCPILEWITHCORECONCRETELIJuncai1，ZHANGYonggang1，DENGYaguang2，HUAXiaolong1(1.CollegeofTrafficEngineering，NanjingUniversityofTechnology，Nanjing，Jiangsu210009，China；2.JiangsuRudongWaterConservancyandElectricPowerConstructionEngineeringCorporation，Nantong，Jiangsu

4、226400，China)Abstract：Thecompositepilecomposedofjet-mixingcementandPHCpipepilewithcoreconcrete(CPCP)isanewkindofcompositepileusedinsoftgroundtreatment.Forpracticalproject，thestaticloadtestassociatedwithfiberBragggrating(FBG)stresstestsandnumericalsimulationswasconductedtounderstandth

5、eloadtransfermechanismofthecompositepile.Withthepiletests，thesidefrictionresistanceandthetipresistanceweremeasuredintermsofaxialstressesunderdifferentloads.Thenthecompatibledeformationofpipepileandcement-soilisobtainedassociatedwiththeirstressdistribution.Thechangeruleofcompressionof

6、eachsegmentisalsoachievedwiththeimposedtopload.Finally，thedifferencesbetweengeneralpipepileandCPCPintermsofresistancecharacteristicswerecompared.Itshowsthat：(1)load-displacement(Q-s)curveofpileheadvariesgradually；(2)pipepileratherthancement-soilbearsamajorityofstructuralload，whilstth

7、ebearingcapacitycharacteristicsofthecompositepilearesimilartothoseoftherigiditypiles；(3)piletipresistancetakesarathersmallerpercentageofthetopload，suggestingthesameperformanceasthatoffrictionpiles.Distributionofpipepileandcement-soilfrictionresistanceissimilar，abouttheratioofCPCPdiam

8、etertoPHCdia