饱和黏性土中污染物运移一维模型试验研究

Experimental Study on One-dimensional Model of Contaminant Transport in Saturated Cohesive Soil

基于一维室内模型试验,以氯化钠溶液来模拟可溶性污染物,以饱和黏性土为介质,研究了污染物在饱和黏性土中的运移规律,分析了渗透路径的增加导致穿透曲线的相关变化,提出了弥散系数的测定方法。结果表明,随着渗透路径的增加弥散系数逐渐增大,同时证明了污染物与饱和黏性土在接触时间较短的情况下,依然存在较明显的离子的吸附解吸现象。为污染物运移模型的研究及场地的污染情况预测提供参考。

Based on the one- dimensional model test,sodium chloride solution was used to simulate soluble contaminants,the contaminant migration in saturated cohesive soil was researched. The related changes of breakthrough curve as the increased infiltration path was analyzed,andthe method for determining the dispersion coefficient was proposed. The results showed that with the increase of infiltration path,the dispersion coefficient increased gradually. When the pollutants and saturated cohesive soil contact for short time,the adsorption- desorption phenomenon of ion was still obvious. The experimental results were available for reference for the establishment of the model for pollutants migration and the pollution forecast.