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Evaluation of bearing capacity of taper type pile foundation taking care of soil compressibility and its application to the performance based design

考虑土体压缩性的锥型桩基承载力评价及其在性能化设计中的应用

基本信息

批准号：
14350260
负责人：
YASUFUKU Noriyuki
金额：
$ 6.85万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

An improved effect of vertical bearing capacity of taper pile expanded in sandy ground is investigated based on the experimental results from a series of the model pile load tests and theoretical considerations. The important results obtained are summarized as follows :1)An apparatus mainly focused on the function of the expanded system of the pile was developed,. The way of changes in horizontal stresses of a model ground surrounding the pile due to its expansion is clarified with reference to the degree of the expansion.2)An improved effect of the skin friction due to the expansion was clarified based on the experimental data. In addition, a simple idea to evaluate the improved pile skin friction is introduced in this study. Its applicability is verified by the experimental data. It can be found from the experimental results that the pile with an expanded function in practice is environmentally effective to improve the pile skin friction.3)An simple estimating method for predicting the vertical bearing capacity of taper type pile was proposed based on the extended cavity expansion theory. It is characterized that the model can evaluate the vertical bearing capacity of taper type pile with different taper angles.4)It was confirmed that the model can also reflect the effect of the soil compressibility on the bearing capacity, by comparing the results from the model pile load tests.5)The rest works were pointed out for introducing the technical outcomes in this study into the performance based design of pile foundation rationally.

在一系列模型桩荷载试验的基础上，结合理论考虑，对砂土中扩径锥度桩的竖向承载力提高效果进行了研究。主要研究结果如下：1)研制了一套主要研究扩桩系统功能的装置；结合桩的膨胀程度，阐明了桩周围模型地基的水平应力随桩的膨胀而变化的途径。2)根据实验数据，明确了膨胀对表面摩擦的改善作用。此外，本文还提出了一种简单的评价桩侧摩阻力的思路。实验数据验证了该方法的适用性。从试验结果可以看出，在实际应用中，带扩展函数的桩对提高桩侧摩阻力是环保有效的。3)基于扩孔扩展理论，提出了一种预测圆锥型桩竖向承载力的简便估算方法。结果表明，该模型能较好地评价不同锥度角锥型桩的竖向承载力。4)通过与模型桩荷载试验结果的对比，证实该模型也能反映土体压缩性对承载力的影响。5)指出了将本研究的技术成果合理地引入基于性能的桩基设计中还需做的工作。