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中文摘要：
为了准确定义成层衬里系统底端边界条件，提出了考虑原始土层影响的成层介质污染物一维扩散模型．采用两层介质之间污染物质量浓度连续和通量连续条件，处理衬里系统底端边界条件．基于顶部边界污染物浓度恒定及平衡线性吸附假设，建立了该模型．并采用与成层地基固结类似的分离变量解法得到了解析解．结果表明，该模型得到的结果和半解析法吻合得较好．随着原始土层厚度的增大，衬里底端质量浓度呈明显减少趋势；当原始土层厚度达到10m以后，质量浓度变化不大．单一的土工聚合黏土衬里（GCL）不足以有效防止填埋场渗滤液的扩散．基于该模型计算得到的结果较Foose基于半无限边界法得到结果更偏于安全．
英文摘要：
To explicitly define the boundary condition at the bottom of liner systems, a one-dimensional model for contaminant diffusion through layered media considering the effect of the original soil layer was presented. After the continuous mass concentration and flux conditions of the contaminant between two media were adopted, the bottom boundary condition of liner systems was treated. The model was developed based on the assumptions of constant top boundary concentration and equilibrium linear adsorption. The analytical solution was obtained by using variable separation analogy similar to that for layered subgrade consolidation. Results show that the model solution agrees well with the semi-analytical solution. The mass concentration at the base of liner systems distinctly decreases with the increasing thickness of the original soil layer. The mass concentration does not change greatly when the thickness of the original soil layer is more than 10 m. Single geosynthetic clay liner （GCL） cannot effectively prevent the diffusion of landfill leachate. Data obtained from the model are safer than those obtained from Foose＇s method.
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