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卫生填埋场防渗层设置工程通常需要筹集大量的优质粘土．这对于许多地区是十分困难的．本文提出了以廉价复合土取代优质粘土的观点．并以普通粘土、伊利士和粉煤灰为对象进行了复合土防渗技术实验研究．结果表明：伊利土与粉煤灰复合后具有良好的抗渗性能，复合上在１．５ｇ／ｃｍ３的密实度下可获得５．４×１０－８ｍ／ｓ的渗透系数．粉煤灰在复合土中的最佳重量百分比范围是２０％～３０％．
Sanitary landfill impermeable layer set up projects usually need to raise a large number of high-quality clay. This is very difficult for many areas. This paper proposes the idea of substituting inexpensive clay for quality clay. The experimental study of composite soil seepage control technology was carried out with ordinary clay, Yili Shi and fly ash. The results show that the combination of Yili soil and fly ash has good impermeability, and the permeability coefficient of 5.4 × 10-8m / s can be obtained at the density of 1.5g / cm3. The optimum weight percentage of fly ash in the composite soil is 20% ~ 30%.