用激光粒度仪进行粘土的颗粒分析

Particle Size Analysis of Clay by Malvern Laser Particle Analyzer

为获得细粒土的粒度分布,分别采用Mastersizer 2000激光衍射粒度仪和传统的密度计法测量合肥地区的粘土。根据激光法的测量原理和影响因素,用单因素试验法依次改变仪器的折射率、质量浓度、超声波端位移和时间、泵速,研究这些控制参数对颗粒粒径的影响,并确定了该仪器测量合肥地区粘土的最佳参数。通过比较最佳参数条件下的激光法和传统密度计法的测量结果,发现激光法在粘土颗粒分析中具有测量范围更广、准确度更高、重复性更好等特点。

In order to study the particle size distribution of fine grained soil,the Malvern Mastersizer 2000 laser diffraction grain size analyzer and traditional densimeter method were used to test the clay in Hefei.According to the work principle and affecting factors of laser method,the parameters,such as the refractive index,concentration,ultrasonic displacement and time,pumping speed of the apparatus,were altered in turn.Then the influence of these control parameters on the particle size was investigated,and the best parameters for the clay in Hefei were identified.The grain size distributions measured by laser method under the best condition and traditional densimeter method were compared,which shows that laser method has a wider measuring range,higher accuracy and better repetitiveness in measuring the particle size distribution of fine grained soil.