超长桩承载特性理论计算与试验方法研究
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摘要
基于超长单桩及群桩受力时的荷载传递原理,研究桩土软化条件下不同软化模型的计算方法,并引入了桩身压缩系数ξ和群桩沉降比R的概念,由此计算出单桩及群桩在外荷载下的沉降量,与实际工程所测数据对比,取得较好的效果;介绍超长桩的室内模型试验、现场原位试验及计算机数值模拟技术等几种研究受力特性和沉降量的方法,并分析各自的优缺点及其适用条件。
Based on the principle of load transfer in the case of long single pile and pile group,the calculation method of different softening model under pile softening condition is studied,and the concept of pile compression coefficient and pile settlement ratio R is introduced.The settlement of single pile and pile group under external load is calculated and compared with the measured data of actual engineering with good results.The indoor model test,field in situ test and computer numerical simulation technology of super long pile,the method of studying the characteristics of stress and the amount of settlement are then introduced,and their advantages and disadvantages and their applicable conditions were also analyzed,which has some guiding significance for its application in engineering.
Based on the principle of load transfer in the case of long single pile and pile group,the calculation method of different softening model under pile softening condition is studied,and the concept of pile compression coefficient and pile settlement ratio R is introduced.The settlement of single pile and pile group under external load is calculated and compared with the measured data of actual engineering with good results.The indoor model test,field in situ test and computer numerical simulation technology of super long pile,the method of studying the characteristics of stress and the amount of settlement are then introduced,and their advantages and disadvantages and their applicable conditions were also analyzed,which has some guiding significance for its application in engineering.
引文
[1]方鹏飞.超长桩承载性状研究[D].杭州:浙江大学,2003.
[2]张凯.超长钻孔灌注桩研究现状与发展[J].山西建筑,2005,31(8):49-50.
[3]陈如桂,何继善.桩土软化作用特性的研究[J].中南大学学报(自然科学版),1997(5):409-413.
[4]辛公锋,张忠苗,夏唐代,等.高荷载水平下超长桩承载性状试验研究[J].岩石力学与工程学报,2005,24(13):2397-2402.
[5]赵春风,李俊,邱志雄,等.广东地区大直径超长钻孔灌注桩荷载传递特性试验研究[J].岩石力学与工程学报,2015,34(4):849-855.
[6]邓友生,郑建强,鄢红良,等.超长桩桩身变形量的计算方法研究[J].湖北工业大学学报,2011,26(2):105-107.
[7]张忠苗,杨淼,房凯.考虑桩身压缩的综合系数法计算超长桩基础沉降[J].岩土力学,2012,33(3):793-798.
[8]任光勇,张忠苗,宋仁乾.桩身混凝土在竖向荷载作用下的压缩量试验研究[J].岩石力学与工程学报,2004,23(2):348-354.
[9]郑刚,张立明,王琦.超长桩荷载传递机理有限元分析[J].天津大学学报(自然科学与工程技术版),2012(11):945-952.
[10]Randolph M F.Science and empiricism in pile foundation design[J].Géotechnique,2003,53(10):847-875.
[11]韦登,徐远前,陈福江.浅析群桩沉降计算方法[J].四川建筑,2008,28(5).
[12]占川,田敬贤,王成华.超长桩群桩沉降实用计算方法述评[J].低温建筑技术,2013,35(2):94-96.
[13]Randolph M F,Wroth C P.An analysis of the vertical deformation of pile groups[J].Surface&Coatings Technology,1979,200(s14!15):4368-4382.
[14]李俊伟.超长大直径群桩基础室内模型试验研究[D].南京:东南大学,2008.
[15]戴永兴.超长大直径群桩基础室外模型试验研究[D].南京:东南大学,2009.
[16]郑建强.陡坡高墩双排嵌岩桩承载特性研究[D].武汉:湖北工业大学,2011.
[2]张凯.超长钻孔灌注桩研究现状与发展[J].山西建筑,2005,31(8):49-50.
[3]陈如桂,何继善.桩土软化作用特性的研究[J].中南大学学报(自然科学版),1997(5):409-413.
[4]辛公锋,张忠苗,夏唐代,等.高荷载水平下超长桩承载性状试验研究[J].岩石力学与工程学报,2005,24(13):2397-2402.
[5]赵春风,李俊,邱志雄,等.广东地区大直径超长钻孔灌注桩荷载传递特性试验研究[J].岩石力学与工程学报,2015,34(4):849-855.
[6]邓友生,郑建强,鄢红良,等.超长桩桩身变形量的计算方法研究[J].湖北工业大学学报,2011,26(2):105-107.
[7]张忠苗,杨淼,房凯.考虑桩身压缩的综合系数法计算超长桩基础沉降[J].岩土力学,2012,33(3):793-798.
[8]任光勇,张忠苗,宋仁乾.桩身混凝土在竖向荷载作用下的压缩量试验研究[J].岩石力学与工程学报,2004,23(2):348-354.
[9]郑刚,张立明,王琦.超长桩荷载传递机理有限元分析[J].天津大学学报(自然科学与工程技术版),2012(11):945-952.
[10]Randolph M F.Science and empiricism in pile foundation design[J].Géotechnique,2003,53(10):847-875.
[11]韦登,徐远前,陈福江.浅析群桩沉降计算方法[J].四川建筑,2008,28(5).
[12]占川,田敬贤,王成华.超长桩群桩沉降实用计算方法述评[J].低温建筑技术,2013,35(2):94-96.
[13]Randolph M F,Wroth C P.An analysis of the vertical deformation of pile groups[J].Surface&Coatings Technology,1979,200(s14!15):4368-4382.
[14]李俊伟.超长大直径群桩基础室内模型试验研究[D].南京:东南大学,2008.
[15]戴永兴.超长大直径群桩基础室外模型试验研究[D].南京:东南大学,2009.
[16]郑建强.陡坡高墩双排嵌岩桩承载特性研究[D].武汉:湖北工业大学,2011.