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1、第36卷第6期哈尔滨工业大学学报Vol136No162004年6月JOURNALOFHARBININSTITUTEOFTECHNOLOGYJune,2004低承台复合桩基承台效应分析123金菊顺,王幼青,肖立凡(1.吉林建筑工程学院土木系,吉林长春130021,E2mail:mail:lixiwoa@sina.com.cn;2.哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090;3.中国市政工程东北设计研究院,吉林长春130021)摘要:为了充分利用低承台复合桩基在竖向荷载作用下,承台分担荷载作用,更好地发挥桩侧摩阻力
2、、端阻力,从而提高桩基承载力,对单桩、不同尺寸的单独承台、不同复合桩基的模型进行了压载试验.并从理论上分析了低承台复合桩基在承台的作用下桩周土受荷变化、荷载传递变化及承载力的变化,得出承台不但本身可分担荷载,而且可使桩侧摩阻力、端阻力均有提高的结论.证明了低承台复合桩基在竖向荷载作用下,承台的效应可提高的结论.证明了低承台复合桩基承载力,大有节约资金之潜力.关键词:承台效应;桩侧摩阻力;桩端阻力;荷载传递中图分类号:TU437文献标识码:A文章编号:0367-6234(2004)06-0838-04Analysisone
3、ffectofpilecappinginlowcappingcompositepilefoundation123JINJu2shun,WANGYou2qing,XIAOLi2fan(1.Dept.ofCivilEngineering,JilinArchitecturalandCivilEngineeringInstitute,Changchun130021,China,E2mail:lixiwoa@sina.com.cn;2.SchoolofCivilEngineering,HarbinInstituteofTechno
4、logy,Harbin150090,China;3.ChinaNortheastMunicipalEngi2neeringDesignandResearchInstitute,Changchun130021,China)Abstract:Inordertotakefulladvantageofthefunctionofpartakingtheloadingbypilecapping,whichfunctionswhenthelowcappingcompositepilefoundationisunderthefuncti
5、onofverticalloading,andfurtheroptimizethefrictionresistanceofpileandend2resistanceofpilesoastoimprovethecappingcapacityofhighpilefoundation.Thispaperintroducesapressuretesttothesinglepile,whosecappingisinadifferentsizeandwhosemodelisofadifferentcompositepilefound
6、ation.Thispaperanalyzesthevariationsoftheeartharoundthepilecausedbyload2ing,thevariationofitsloadingtransmissionandthevariationofbearingcapacityofpile.Itcanbeprovedthatthepilecappingnotonlycouldshareloadingbyitselfbutalsocouldimprovethelateralfrictionalresistance
7、ofpileandtheendresistanceofpile.Italsocouldtestifythatwhenthelowcappingcompositepilefoundationisunderthefunc2tionofverticalloading,theeffectofpilecappingcanimprovethebearingcapacitycappingofhighpilefoundationandreallyhasthepotentialityofsavingthecapital.Keywords:
8、effectofpilecapping;frictionresistanceofpile;end2resistanceofpile;loadingtransmission[3]桩是深入土层的柱型构件,桩与连接桩顶的桩基能够提高承载力,是因为承台效应使其受[1]承台组成深基础.以往认为在竖向荷载作用下,力状态发生变化引
