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

研究化学污染物对粘土渗透率和有效孔隙度的影响，预测化学污染粘土的原位输入参数。采用数学模型求解地下水污染问题。土壤的有效孔隙度、渗透率和化学扩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原位测量值。目前的原位测试方法无法估计这些输入参数。粘土的电学性质将在本研究中得到利用。流体流动只发生在粘土与电解溶液混合形成的团簇之间，并且由于物理化学相互作用，团簇的体积随着化学物质的通过而变化。土壤的电学性质表现出这种相互作用，可以量化簇的体积。笔者前期的研究表明，通过测定土壤电学性质来预测原位渗透率是可行的。因此，将采用无损原位电法预测原位有效孔隙度和化学污染物通过过程中土壤渗透性的变化。研究结果可以更好地预测局部污染物羽流，并在一定条件下预测区域流量计算。

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.