反滤系统渗透流失土颗粒级配的显微图像分析法

在反滤系统渗透稳定性的研究中，提出采用数码显微镜和图像分析软件测定渗透流失土颗粒级配的方法。该法可对渗透流失的少量土颗粒进行级配分析，测定成本低，但对取样要求较高。针对所用的粉土，采用异丙醇作为分散剂，颗粒浓度取4 g/L，可获得良好的测定效果。与比重计法测定结果的对比分析表明，显微图像分析法是可靠的。误差分析表明，对于扁平不规则的土颗粒，显微图像分析法测定的级配曲线粒度偏大，细颗粒产率偏低，而比重计法则相反。显微图象分析法可为反滤系统渗透稳定性研究提供有效的手段。

Microscopic image analysis method for grading of eroded soil particles from filtration system

A method of particle size distribution testing with digital microscope and image analysis software is presented during the research of the stability of filtration system. Microscopic image analysis method is suitable for gradation analysis of small quantity of soil particles which can not be tested through densimeter method. Cost of this testing method is low; but the sampling requirement is high. Good testing result for the silt adopted in the test was achieved by taking isopropyl alcohol as dispersant and 4 g/L as the concentration of the soil. Compared with the testing result of densimeter method, it is shown that the testing result of microscopic image analysis method is credible. Error analysis shows that for the flat and irregular particles, microscopic image analysis method tends to get higher particle size and less fine particles; and densimeter method tends to get the opposite result. Microscopic image analysis is an effective method for the study of the stability of filtration system.