The Influence of Chemical Contaminants on Permeability and Effective Porosity of Clay

该方案研究化学污染物对粘土渗透率和有效孔隙率的影响，以预测化学污染粘土的现场输入参数。采用数学模型对地下水污染问题进行了求解。土壤的有效孔隙度、渗透率和化学弥散系数是这些模型所需的输入参数。这些输入参数必须是污染后的现场测量值。目前的现场测试方法不能估计这些输入参数。粘土的电学性质将被用于这项研究。流体流动只发生在粘土和电解液混合形成的团簇之间，由于物理化学作用，团簇体积随着化学物质的通过而变化。表现出这种相互作用的土壤的电学性质可以量化团簇的体积。作者以往的研究表明，通过测定土体的电性来预测现场渗透率是可行的。因此，非破坏性原位电法将被用来预测化学污染物通过过程中的原位有效孔隙度和土壤渗透性的变化。研究结果将有助于在一定条件下更好地预报局部污染物羽流和区域水流计算。

This proposal investigates the influence of chemical contaminants on permeability and effective porosity of clay to predict the in- situ input parameters of chemically contaminated clay. Mathematical models are adopted to solve the problems of ground water contamination. The effective porosity, permeability and chemical dispersion coefficient of soils are the required input parameters for these models. These input parameters must be post-contaminated in-situ measured vales. The current in-situ test methods are not capable of estimating these input parameters. The electrical properties of clays will be utilized in this investigation. Fluid flow occurs only between the clusters formed by mixing of clays with electrolytic solutions, and the cluster volume changes with the passage of chemicals due to physico-chemical interactions. The electrical properties of soil exhibiting such interactions can quantify the cluster volumes. Previous studies by the author showed the feasibilty of predicting in-situ permeability by determining the electrical properties of soil. Therefore, the non-destructive in-situ electrical method will be used to predict in-situ effective porosity and change in soil permeability during the passage of chemical contaminants. The research results will enable a better prediction of local contaminant plume and a prediction of regional flow computations under certain conditions.