计算动力触探修正系数的多项式拟合法

The polynomial fitting method in calculating DPT correction factor

给出了用于计算动力触探修正系数的多项式拟合法。首先通过比对确定了拟合函数,指出用二次多项式拟合是考虑精确性和实用性的最佳契合点,通过数学分析介绍了双因素函数拟合的嵌套方法,并给出了重型动力触探修正系数在考虑杆长和实测锤击数条件下的二元二次多项式拟合函数及其行列式形式。通过拟合出的修正系数与规范所给的修正系数之间的误差分析判定拟合函数精度较好,适于工程应用。并且此公式适用于计算机计算。

This paper introduces a method of polynomial fitting in calculating the dynamic penetration test（DPT）correction factor.Firstly,through the contrast,the author decides the fitting function,and points out that the optimal way of accuracy and practicability is by using the quadratic polynomial fitting method.Then,through the mathematical analysis,it introduces the two-factor function fitting.Furthermore,it works out the binary quadratic polynomial fitting function and its determinant form of the correction factor in heavy DPT test considering the rod length and measured blow count.Through the deviation analysis,which is between correction factor by fitting and on the specification,we can confirm that the accuracy of the formula is better,and can well meet the project requirement.This formula can be applied in computer-based calculation.