• 全国中文核心期刊
  • 中国科技核心期刊
  • 美国工程索引(EI)收录期刊
  • Scopus数据库收录期刊

基于恒刚度剪切试验的预制桩侧阻退化估计

刘俊伟, 张忠苗, 俞 峰, 赵玉勃

刘俊伟, 张忠苗, 俞 峰, 赵玉勃. 基于恒刚度剪切试验的预制桩侧阻退化估计[J]. 岩土工程学报, 2012, 34(4): 725-729.
引用本文: 刘俊伟, 张忠苗, 俞 峰, 赵玉勃. 基于恒刚度剪切试验的预制桩侧阻退化估计[J]. 岩土工程学报, 2012, 34(4): 725-729.
LIU Jun-wei, ZHANG Zhong-miao, YU Feng, ZHAO Yu-bo. Estimation of friction fatigue for preformed piles based on constant normal stiffness shear test[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(4): 725-729.
Citation: LIU Jun-wei, ZHANG Zhong-miao, YU Feng, ZHAO Yu-bo. Estimation of friction fatigue for preformed piles based on constant normal stiffness shear test[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(4): 725-729.

基于恒刚度剪切试验的预制桩侧阻退化估计  English Version

详细信息
    作者简介:

    刘俊伟: LIU Jun-wei (1983 – ), male, Ph. D. Candidate. He has been engaged in researches on the behavior of jacked piles.

  • 中图分类号: TU473

Estimation of friction fatigue for preformed piles based on constant normal stiffness shear test

More Information
    Author Bio:

    LIU Jun-wei (1983 – ), male, Ph. D. Candidate. He has been engaged in researches on the behavior of jacked piles.

  • 摘要: 采用双向循环恒刚度剪切试验对预制桩的侧阻退化效应进行试验研究。研究显示,剪切应力(摩阻力)随剪切循环数的增加呈指数型衰减,衰减主要发生在开始的部分循环内,约 25 个循环后基本达到稳定。剪切过程中剪切带发生明显的剪缩,导致法向应力释放,此为摩阻力退化的 原因之一 。随剪切循环数的增加界面摩擦角发生指数型退化直至达到残余值,此为摩阻力退化的另一原因。法向刚度的大小决定剪切应力、法向应力和界面摩擦角衰减的速度和幅度,法向刚度越大,衰减越快且残余值越小。恒刚度剪切试验说明桩土界面摩擦力的退化与桩周土的坚硬程度密切相关,土体越硬则侧阻退化现象越明显。
    Abstract: A series of constant normal stiffness direct shear tests are performed to investigate the friction fatigue for preformed piles. The results show that the shear stress (friction resistance) displays a exponential decay trend with the increasing shear cycle number, and most of the reduction occurs during the first few cycles and reaches a steady value after about 25 cycles. Cyclic shears induce a contraction of the narrow shear zone, leading to a release of normal stress, which is one of the causes for the friction fatigue. The interface friction angle decreases exponentially with the shear cycles within the first few cycles and subsequently approaches a residual value, which is another cause for the friction fatigue. The normal stiffness controls the degradation rates and degradation extents of the shear stress, normal stress and interface friction angle. A larger normal stiffness causes a faster degradation and a smaller residual value. The above results indicate that the pile-soil friction fatigue is closely related to the stiffness of the surrounding soil, and the stiffer soil will lead to a more evident friction fatigue effect.
  • [1] ZHANG L M, WANG H. Field study of construction effects in jacked and driven steel H-piles[J]. Géotechnique, 2009, 59(1): 63–69.
    [2] HEEREMA E P. Predicting pile driveability: heather as an illustration of the friction fatigue theory[J]. Ground Engineering, 1980, 13: 15–37.
    [3] RANDOLPH M F, DOLWIN J, BECK R. Design of driven piles in sand[J]. Géotechnique, 1994, 44(3): 427–448.
    [4] DE NICOLA A. Performance of pipe piles in sand[D]. Perth: University of Western Australia, 1997.
    [5] CHOW F C. Investigations into the behaviour of displacement piles for offshore foundations[D]. South Kensington: Imperial College, University of London, 1997.
    [6] BRUNO D. Dynamic and static load testing if driven piles in sand[D]. Perth: University of Western Australia, 1999.
    [7] WHITE D J, LEHANE B M. Fiction fatigue displacement piles in sand[J]. Géotechnique, 2004, 54(10): 645–658.
    [8] JOHNSTON I W, LAM T S K, WILLIAMS A F. Constant normal stiffness direct shear testing for socketed pile design in weak rock[J]. Géotechnique, 1987, 37(1): 83–89.
    [9] BOULON M, FORAY P. Physical and numerical simulation of lateral shaft friction along offshore piles in sand[C]// Third International Conference on Numerical Method in Offshore Piling, Editions Technip, France, 1986: 127–147.
    [10] FIORAVANTE V. On the shaft friction modeling of non-displacement piles in sand[J]. Soils and Foundations, 2002, 42(2): 23–33.
    [11] DEJONG J, RANDOLPH M F, WHITE D J. Interface load transfer degradation during cyclic loading: a microscale investigation[J]. Soils and Foundations, 2003, 43(4): 81–89.
    [12] WHITE D J, BOLTON M D. Displacement and strain paths during plane strain model pile installation in sand[J]. Géotechnique, 2002, 54(6): 375–398.
    [13] LEHANE B M, WHITE D J. Lateral stress changes and shaft friction for model displacement piles in sand[J]. Can Geotech J, 2002, 42: 1039–1052.
    [14] FAHEY M, LEHANE B M, STEWART D. Soil stiffness for shallow foundation design in the Perth CBD[J]. Australian Geomechanics Journal, 2003, 38(3): 61–90.
    [15] ZHANG Z M. Pile foundation engineering[M]. Beijing: China Construction Industry Press, 2007. (in Chinese)
    [16] FAKHARIAN K, EVGIN E. Cyclic simple-shear behaviour of sand-steel interfaces under constant normal stiffness condition[J]. J Geotech Geoenviron Eng, 1997, 123(12): 1096–1105.
计量
  • 文章访问数: 
  • HTML全文浏览量:  0
  • PDF下载量: 
  • 被引次数: 0
出版历程
  • 发布日期:  2012-04-19

目录

    /

    返回文章
    返回