【作者】 刘玮；

【导师】 陈应波；

【作者基本信息】 武汉理工大学 ， 结构工程， 2007， 硕士

【摘要】 桩基础作为深基础的一种，具有承载能力高，适用范围广等优点，被广泛地运用到各类工程中，桩的承载力性状问题直接影响到其所能发挥的作用，在实际工程中桩侧阻力作为桩基竖向承载力的一个重要组成部分，又是一个受到诸多因素影响的复杂问题。随着对桩基承载性状研究的不断深化，深入研究影响桩侧阻力的因素，探讨桩侧阻力的取值方法和计算手段，在工程实践中具有非常重要的意义。但限于直接试验中诸多因素的影响，仅通过试验数据得出桩侧阻力分布曲线的方法其准确性尚有争议。通常计算桩侧阻力的方法有静力计算法、原位测试法、经验估算方法等。本文着重于推导出影响桩侧阻力变化的桩土作用力学模型，对桩侧阻力随桩顶荷载改变所产生的变化进行模拟研究，这些研究对于深入研究桩侧阻力的变化规律，深化对桩基承载性状的认识，在理论和实践上都具有十分重要的意义。本文首先对影响桩侧阻力的各种因素进行了深入分析，提出工程中应如何处理这些因素以最大限度地发挥桩侧阻力的作用，并根据所选取的桩型和土层建立了合理的桩土作用模型，通过此模型及相关试验数据进行桩侧阻力分布的曲线拟合，并用数值方法对侧阻力的变化规律进行模拟。为进一步研究侧阻力随桩顶荷载不同而产生的变化，文中利用有限元方法对不同级荷载作用下侧阻力曲线的变化规律进行了初步分析和探讨，对改进桩的承载力性状以实现设计及实际工程中侧阻力的充分发挥和利用提供了依据。为了验证曲线拟合的可行性，文章最后将模拟得出的曲线与某些研究机构通过较精确检测所得到的数据曲线进行了对比分析，结果比较吻合，为今后的理论分析及工程实践提供了参考。更多还原

【Abstract】 As one of deep foundation, pile foundation is applicable for different load-forms and different conditions of construction engineering , it is widely used in many kinds of projects. The bearing capacity directly affects the function which the pile can display. The shaft resistance is an important part of vertical bearing capacity, and it’s also a complex problem which can be influenced by many factors. With the development of the research on the pile bearing capacity, carrying deep research on influencing factors of pile shaft resistance, discussing the method of value selection and calculating method are highly meaningful in practical engineerings.But, be limited by kinds of influencing factors in direct test, the distributing curves of the shaft resistance is not so accurate. The usual methods to calculate pile shaft resistance are static method; in situ-testing; empirical method etc. This paper mainly focuses on deducing the model of pile-soil interaction which affect the shaft resistance, and doing research on simulation of variety of the shaft resistance which is changed by different top-load on pile. The research has great significance on both theory and practice in analyzing the changing regularity of the shaft resistance deeply and reinforcing the cognition of the pile bearing performance.This paper analyze the influencing factors of the pile shaft resistance deeply at first, then present how to deal with these factors to display the function at the most in project. According to the pile type and the soil layer, reasonable model of the pile-soil interaction are established. With this model and related experimental findings, a curve fitting model is calculated, and the variable situation is simulated by using numerical method.For further studies on the changing regularity of the shaft resistance which is changed by the different top-load on pile, the paper analyzes and discusses the regularity of the shaft resistance with the FEM method. These studies give evidence s to improve the performance of pile bearing capacity in design and practical engineering . At last, the fitting curves and the experimental data are compared. Results show that the calculated results are in good agreement with the test data. And the studies supply good reference for the further theoretical analysis and the practical engineering.更多还原