Based on the engineering characteristics of anti-seepage system in waste landfill sites, the rainfall infiltration mechanism of the landfill site was analyzed, and the water dynamic mathematical model of the anti-seepage system was set up. Through the numerical analysis, the changes of pore water pressure and moisture content of the anti—seepage system were researched under the condition of rainfall. The results showed that the rainfall infiltration could change the seepage condition of the structure layer, and there is the seepage force on the top, the slope surface and the slope toe. The negative pore water pressure gradually decreased with the rainfall continuing. The pore water pressure curve waved largely in the horizontal distribution, and appeared the peak in the slope toe. The moisture content in each structure layer gradually increased with the rainfall continuing, and it could increase the density of the material. The material of the structure layer gradually reached its storage capacity to the saturation because of the rainfall infiltration, and the soil changed from unsaturation to saturation.%基于填埋场防渗系统的工程特性,分析了填埋场的降雨入渗机理,建立了填埋场防渗系统水分动态数学模型,通过数值分析研究了降雨作用下填埋场防渗系统孔隙水压力和含水率的变化情况.结果表明:降雨入渗使填埋场结构层渗流条件发生变化,在坡顶、坡面、坡脚处均产生渗透力,且随着降雨时间的持续,负孔隙水压力逐渐减小;在水平分布上,孔隙水压力曲线呈较大的波动性,且在坡脚处出现峰值.受降雨持续作用,填埋场各结构层含水率逐渐增加,导致材料的密度逐渐增大;结构层材料因雨水的入渗逐渐达到其储水能力而饱和,土体由非饱和向饱和过程转化.
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