土粒比重试验比重瓶质量校准——线性拟合和多项式拟合曲线对比

Mass Calibration of Pycnometer in Soil Particle Specific Gravity Test——Comparison of Linear Fitting and Polynomial Fitting Curves

比重瓶法测土粒比重的关键,是准确得到温度与比重瓶、水总质量关系曲线。本文用线性拟合、多项式拟合温度与瓶、水总质量曲线,通过线性和多项式拟合方程式校准比重瓶,比较两者优劣。实验表明比重瓶校准,多项式拟合效果更好;土粒比重试验(比重瓶法)纯水水温保持在25~40℃时误差最小。

The key to measuring the specific gravity of soil particles by Pycnometer method is to accurately obtain the relationship curve between temperature and the total mass of pycnometer and water. In this paper, To compare the advantages and disadvantages of linear fit and polynomial fitting, linear fitting and polynomial fitting are used to fit the curves of temperature and total mass of bottle and water. The results shows that,for the calibration of pycnometer, polynomial fitting is better. The soil grain proportion test(specific gravity bottle method) has the smallest error when the water temperature of pure water is kept at 25 to 40 ℃.