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针对灰坝灰面上部来水和地层渗透性相差较大而且地下水埋藏较深的复杂渗流情况，采用饱和─非饱和渗流模型进行分析，避开了用饱和渗流方法分析时带来的边界条件处理和自由面调整的困难。其计算结果合理，为分析灰水下渗对地下水污染问题提供了依据，并为解决具有多层自由面地层的复杂渗流分析提供了一个简单实用的方法。
In view of the complex infiltration between the upper part of the gray surface and the permeability of the strata, and the deep buried deep groundwater, the saturated-unsaturated seepage model is adopted to avoid the boundary conditions caused by the saturated seepage method And free surface adjustment difficulties. The calculation results are reasonable, which provides the basis for analyzing the problem of gray water infiltration on groundwater pollution and provides a simple and practical method for solving complicated seepage analysis with multi-layer free surface formation.