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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.

基于一系列模型桩荷载试验的实验结果和理论考虑，研究了沙地基中扩锥桩竖向承载力的提高效果。取得的重要成果概括如下：1)研制了一种主要针对桩扩系统功能的装置。根据膨胀程度，阐明了桩周围模型地面水平应力因膨胀程度而变化的方式。2)基于实验数据，阐明了膨胀对表面摩擦力的改善效果。此外，本研究还介绍了评估改进的桩皮摩擦力的简单想法。实验数据验证了其适用性。实验结果表明,在实际应用中具有膨胀功能的桩对于改善桩壁摩擦力是一种环境有效的方法。3)基于扩展空腔膨胀理论,提出了一种预测锥形桩竖向承载力的简单估算方法。其特点是可以评价不同锥角锥型桩的竖向承载力。4)通过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引入桩基性能化设计中的其余工作。