刚性基础下柔性桩桩侧摩阻力及有效桩长的研究

RESEARCHES ON DISTRIBUTION OF FRICTIONAL RESISTANCE AND EFFECTIVE LENGTH OF FLEXIBLE PILE UNDER RIGID FOUNDATION

复合地基加固软土地基应用广泛,但对其加固机理的认识还并不全面,对摩阻力的分布规律也有待研究。基于桩土顶部位移相等原理,利用Mindlin位移解推导了刚性基础下柔性桩摩阻力和桩轴力的分布形式,得到最大摩阻力及其深度的计算公式。对摩阻力分布形式进行简化,并在此基础上推导出有效桩长的计算公式。

Composite ground can be widely used in the improvement of soft foundation, but the mechanism is incomplete, the distribution of frictional resistance should be researched in detail. Based on vertical displacements equality between pile and surrounding soil in the composite foundation, the distributions of frictional resistance and axial force are derived with blindlin＇ s solution of displacement, and the formuls of maximum frictional resistance and its depth are also obtained. The formula of effective length of pile is given by means of simplifying distribution of frictional resistance.