中文摘要：

在建立生活垃圾污染模拟试验装置的基础上，制备了深度为22．5cm、45．0cm、67．5cm和90．0cm的污染粘土，分别通过扫描电镜（SEM）和变水头渗透试验测定了污染粘土的渗透特性和微观结构，采用MATLAB软件计算了污染粘土的微观结构参数。研究表明，粘土遭受生活垃圾污染后渗透性降低；随着污染深度的增加，污染粘土总孔隙面积、表观孔隙比和平均孔径逐渐增大，渗透系数逐渐提高；粘土孔隙逐渐由以小孔和中孔为主演化为以大孔和超大孔为主。

英文摘要：

Based on the development of an experimental device simulating the contamination of domestic waste, contaminated clays were prepared at four pollution depths of 22. Scm, 4S.0cm, 67. Scm and 90.0cm. Subsequently, the scanning electron microscopy （SEM） was employed to identify the microstructure of the contaminated clays. Meanwhile, variable head permeability test was performed to determine the permeability of the contaminated clays. Finally, the MATLAB software was utilized to extract and calculate microstructure parameters. The research results show that the clays decline in permeability after subjected to the contamination of domestic waste leachate. The total pore area, apparent void ratio and mean pore size, as well as＂ ermeability coefficient, increase consistently with the increasing pollution depths. The pores of the clay present a gradual evolution from mainly minor and medium pores to major macro and super macro pores.