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不同加载条件下抗拔桩静载试验分析

刁钰, 郑刚, 许洁, 欧阳惠敏, 徐燕

刁钰, 郑刚, 许洁, 欧阳惠敏, 徐燕. 不同加载条件下抗拔桩静载试验分析[J]. 岩土工程学报, 2011, 33(sup2): 464-470.
引用本文: 刁钰, 郑刚, 许洁, 欧阳惠敏, 徐燕. 不同加载条件下抗拔桩静载试验分析[J]. 岩土工程学报, 2011, 33(sup2): 464-470.
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DIAO Yu, ZHENG Gang, XU Jie, OUYANG Hui-min, XU Yan. Comparative analysis of static uplift pile load tests under different loading conditions[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(sup2): 464-470.
Citation: DIAO Yu, ZHENG Gang, XU Jie, OUYANG Hui-min, XU Yan. Comparative analysis of static uplift pile load tests under different loading conditions[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(sup2): 464-470.
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不同加载条件下抗拔桩静载试验分析  English Version

  • 1.滨海土木工程结构与安全教育部重点实验室天津大学,天津 300072 ； 2. 天津大学建筑工程学院,天津 300072 ； 3. 天津市建筑科学研究院,天津 300093

基金项目: 国家自然科学基金项 目( 50878144)；国家重点基础研究发
详细信息
    作者简介:

    刁 钰 (1982 – ) ,男,讲师,从事土力学及岩土工程的教学与研究。

  • 中图分类号: TU473

Comparative analysis of static uplift pile load tests under different loading conditions

  • 1. MOE Key Laboratory of Coast Civil Structure Safety, Tianjin 300072, China; 2. Department of Civil Engineering, Tianjin University, Tianjin 300072, China; 3. Tianjin Research Institute of Building Science, Tianjin 300093, China

摘要

    摘要
  • 摘要: 对于抗拔桩的静载试验,理想试验条件是只在桩顶施加拉力,但是实际中拉力的获得需要在地面设置反力装置,不可避免地影响桩周土状态。若采用 Osterberg 法,也不符合仅在桩端施加上托力的理想条件,因为荷载箱同样会通过桩端土或下段反力桩影响桩周土体。本文通过现场试验和有限元模拟,考察了不同加载条件下的桩的静载试验。结果表明,常规拔桩试验和 Osterberg 法试桩的承载力相近,但前者比后者测得的刚度要大。 Osterberg 法试桩、理想条件下托桩试桩和理想条件下拔桩的结果接近,可以认为反映了单桩实际的受力和变形特征。因此,常规拔桩试验的结果高估了单桩的刚度。常规拔桩高估单桩刚度的主要原因在于反力装置将荷载作用于桩上部土体。一方面,增加了桩上部的侧摩阻力和刚度；另一方面,反力增大了桩土相对位移,桩在相同桩顶位移下,常规拔桩比理想拔桩可发挥出更大的侧摩阻力,从而也提高了刚度。
    Abstract: For the static uplift pile load tests, the ideal tension condition is that only the tensile load is applied on the pile head. However, in the conventional uplift tests the reaction system can influence the soil surrounding piles. Also, the Osterberg cell test is also different from the ideal pushing condition where only the compressive force is applied on the pile toe, because the Osterber cell can influence the soil surrounding pile via contact soil or reaction pile beneath the pile toe. In this paper, the field pile load tests and FEM simulation are conducted to investigate the pile load tests under different loading conditions. It is found that the capacity of pile in the conventional uplift tests is closed to that in the Osterberg cell test, while the stiffness in the former is higher than that in the later. The Osterberg cell test, the ideal pushing test and ideal uplift test give similar results, which are regarded to be consistent with the characteristics of load transfer and settlement performance of real single tension piles. Therefore, the conventional uplift tests overestimate the stiffness of pile. It is due to the reaction system which transfers the reaction load to the soil surrounding the upper part of pile. On the one hand, the skin friction and the stiffness of the upper part of pile are increased. On the other hand, the reaction load increases the pile-soil relative displacement. For a given settlement of pile head, the practical tension tests can mobilize larger skin friction than the ideal tension tests and hence increases the stiffness of pile as well.
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    • 参考文献(13)
  • [1] MANDOLINI A, RUSSO G, VIGGIANI C. Pile foundations: experimental investigations, analysis and design[C]// Proc 16th Int Conf Soil Mechs Geot Eng. Osaka, 2005.
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出版历程
  • 收稿日期:  2011-08-21
  • 发布日期:  2011-12-06

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