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高抛填钢管桩负摩阻力现场试验研究

刘兹胜

刘兹胜. 高抛填钢管桩负摩阻力现场试验研究[J]. 岩土工程学报, 2015, 37(2): 337-342. DOI: 10.11779/CJGE201502018
引用本文: 刘兹胜. 高抛填钢管桩负摩阻力现场试验研究[J]. 岩土工程学报, 2015, 37(2): 337-342. DOI: 10.11779/CJGE201502018
LIU Zi-sheng. Field tests on negative skin friction of steel pipe piles in high backfilling soils[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(2): 337-342. DOI: 10.11779/CJGE201502018
Citation: LIU Zi-sheng. Field tests on negative skin friction of steel pipe piles in high backfilling soils[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(2): 337-342. DOI: 10.11779/CJGE201502018

高抛填钢管桩负摩阻力现场试验研究  English Version

详细信息
    作者简介:

    刘兹胜(1981- ),男,工程师,主要从事港口工程结构与岩土工程等方面的科研。E-mail: liuzisheng@gmail.com。

  • 中图分类号: TU47

Field tests on negative skin friction of steel pipe piles in high backfilling soils

  • 摘要: 大面积高填土软土地基在抛石作用下,周边填土的沉降易使桩基产生负摩阻力,为掌握负摩阻力作用规律,在上海洋山深水港工程钢管桩进行了现场试验,取得了试验桩负摩阻力分布、数值大小、随时间变化情况、中性点位置、下拉荷载等关键参数的认识。结果表明:①桩身负摩阻力的发展存在明显的时间效应,软土层负摩阻力达到峰值的时间较短,而土质好、埋深大的土层,负摩阻力达到峰值的时间较长。②现场试验得到的抛石棱体的负摩阻力系数达0.8,淤泥质黏土的负摩阻力系数仅为0.04,其它土层的负摩阻力系数与规范吻合良好。③在抛填完成后近九个月时间内,基桩下拉荷载在持续增大,最大下拉荷载达7740.4 kN,中性点深度在0.62L~0.68L之间,由抛石产生的负摩阻力达184.4 kPa,这在今后的类似工程设计中应该引起重视,适当采取减小负摩阻力的措施。
    Abstract: For the piles in large-area high fill soft soils, rubble mound may cause negative skin friction on piles because of the settlement of backfilling soils. To grasp the influence of the negative skin friction, field tests are carried out on a steel pipe pile of Yangshan Port of Shanghai. The knowledge on key parameters such as distribution, magnitude and temporal variation of the negative skin friction of the pile, location of neutral point and downdrag force is acquired. The results indicate that: (1) the time effect of the negative skin friction on the pile is obvious. The time for the negative skin friction of soft soils to reach its peak is shorter, while that for the good soils with large embedded depth is longer; (2) the measured negative skin friction coefficient of rubble mound is up to 0.8, while the coefficient of silty soft clay is only 0.04, the coefficients of other soils are in good agreement with the technical code of China; (3) in nearly nine months after rubble mound construction is completed, the down drag force of the pile continues to increase. The maximum downdrag force is up to 7740.4 kN, depth of the neutral point is between 0.62L ~ 0.68L, and the negative skin friction generated by the rubble mound is up to 184.4 kPa. Attention should be paid to the design of similar projects in the future, and appropriate measures should be taken to reduce the negative skin friction.
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出版历程
  • 收稿日期:  2014-04-08
  • 发布日期:  2015-03-01

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