Numerical simulation of seepage in the landfill leachate layers

Abstract

In order to control the environmental pollution caused by landfill leachate, the numerical simulation of landfill leachate seepage was carry out, which considered the influence of anisotropy of permeability coefficient, the permeability coefficient, matrix suction, infiltration amount of leachate, slope of drainage layer, drainage distance and initial water head on the maximum saturation depth. The results showed that when the horizontal permeability coefficient is fixed and the vertical permeability coefficient is reduced, the maximum saturation depth of leachate increased sharply. The maximum saturation depth linearly increased with the infiltration of leachate, whereas sharply decreased with the increasing of drainage slope. The maximum saturation depth is less affected by small drainage distance, whereas more affected by the large drainage distance. The initial head has a great effect on the maximum saturation depth, and whether the drainage pipe can discharge the leachate or not has an important influence on the maximum saturation depth.