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研究桩测摩阻力和桩端阻力的分配比例,并作出数量上的评价,是研究单桩垂直承载力的重要组成部分,也是分析桩荷载传递机理的基础。其结果是制定桩侧摩阻力和桩端阻力的参数值的前提,是静力计算公式的依据,也是分析施工工艺和施工质量对单桩承载能力影响的准绳。利用桩的静载试验资料进行桩侧摩阻力和桩端阻力划分的方法有8种,现予介绍并加以适当评述。一、回零图解法此法由A. F. van weele(1957)提出,桩按循环加卸载法进行,绘制桩顶荷载和桩端地基弹性变形曲线(P-S_e2曲线,图37)。
Studying the distribution ratio of pile friction resistance and pile tip resistance, and making a quantitative evaluation, is an important part of studying the vertical bearing capacity of a single pile, and is also the basis for analyzing the pile load transfer mechanism. The result is the premise of formulating the parameter values of pile side friction resistance and pile end resistance, which is the basis of the static calculation formula, and is also the criterion for analyzing the effect of construction technology and construction quality on the bearing capacity of a single pile. There are eight methods for the classification of pile friction resistance and pile end resistance using the pile static load test data, which are introduced and reviewed appropriately. 1. Zero-return plot method This method was proposed by A. F. van Weele (1957). Piles were loaded by the cyclic loading and unloading method. Plots of the pile top load and the elastic deformation curve at the pile end were plotted (P-S_e2 curve, Fig. 37).