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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.

根据一系列模型桩荷载试验结果和理论分析，探讨了砂土中扩底扩底桩竖向承载能力的改善效果。取得的重要成果如下：1)研制了一套以桩身展开系统功能为主要研究对象的装置。2)根据试验数据，阐明了扩容引起的桩侧摩阻力的改善效应。此外，本研究还提出了一种评价改进桩侧摩阻力的简单方法。实验数据验证了该方法的适用性。从试验结果可以看出，扩展功能桩在实际应用中对改善桩侧摩阻力是环保有效的。3)基于扩展空腔扩张理论，提出了一种预测锥形桩竖向承载力的简便估算方法。4)通过与模型桩载荷试验结果的比较，验证了该模型也能反映土体可压缩性对桩承载力的影响。5)为将本研究的技术成果合理地引入桩基性能化设计中，指出了有待进一步研究的工作。