沙漠沙的筛分粒径与粒径计粒径的比较实验

筛分法与粒径计法是两种重要的颗粒分析方法。本文通过较为系统的实验发现采用这两种方法所得到的实验结果之间存在较大的偏差。采用粒径计法测得的样品粒径较之用筛分法所得的结果明显偏大 ,说明用这两种原理不同的颗分方法所测出的粒径数据不能不加换算地直接采用。由于目前有关筛分粒径与粒径计粒径转换关系的研究结果并不一致 ,所以文中比较了几家代表性研究成果之间的差异 ,重点讨论了采用不同沉降速度公式进行计算时所得粒径计粒径之间的差异 ,探讨了各家结果不同的原因 ,对与颗粒粒径相关的研究具有参考价值

Comparison of Desert Sand Particle Sizes Obtained from Sieving and Settling Approaches

Sieving and settling analyses for sediment particle size are primary approaches widely used in engineering practice. In order to compare the particle sizes obtained from the two different approaches, a series of experiments were conducted for sediment samples ranged from 0.062mm to 2.0mm. The results show that the particle diameters from settling analysis are apparently greater than those from sieving analysis. The former is subject to change while different settling-velocity formulas are used for calibration. Revising relation between particle diameters in terms of sieving and settling analyses were established. In addition, the differences were found among the existing results from different investigators owing to various influencing factors such as analysis approach, experimental equipment, the formula of settling velocity used to calculate the particle diameter, the range of the particle size, and so on.