单桩竖向抗压承载力统计值的探讨

Discussion on Statistic Value of Bearing Capacity of Pile under Static Axial Compressive Load

本文通过一个工程实例,说明《建筑基桩检测技术规范》(JG J106-2003)中关于单桩竖向抗压承载力统计值的方法在某些情况下,不符合数理统计原理,是不合理的。按《建筑桩基技术规范》(JG J 94-94)计算起来比较繁琐,但却是严格按数理统计原理进行的,事实证明此法较为合理。本文还针对在进行3根以上桩的折减系数λ计算,出现多个值时的选择进行了探讨,得出合理的解决方法。

In this paper an engineering case is used to illustrate that, in some cases, the method assigned by Technical Code for Testing of Building Foundation Piles （ JGJ106 - 2003 ） for statistic value of bearing capacity of pile under static axial compressive load is unreasonable because it does not accord with the principle of statistics. Although the statistic value calculating by the regulation of Technical Code for Building Pile Foundations （JGJ 94 -94） is pretty complex, it is conducted by the principle of statistics strictly. In fact the latter is proved to be reasonable. The determination of multi discount coefficientλ when test pile number is more than 3 is also discussed and a reasonable method is presented in the paper.