关键词: 红层, 衬层土壤, 饱和密度, 防渗性能, 填埋场

Abstract: The soil of landfill liners was derived mainly from nearby area. There was a close correlation between the antipollution capacity of liners and soil permeability. The standard consolidation experiment was carried out on the sieved soil with six particle size ranges at different depths near the typical red-layer landfill in Sichuan Province， so as to study the fundamental physical parameters and the trend of changes in saturated density and permeability coefficient. According to the experimental results， the saturated density of red-layer sieved soil（ρsat） ranged from 0.13 to 0.25 g/cm3 at the early consolidation stage （P≤800 kPa）， and it was from 0.11 to 0.18 g/cm3 at the later stage （800 kPa＜P＜3 200 kPa）， both showed a trend of logarithmical increase. Besides， there was a significant linear negative correlation between the ρsat and the void ratio e （r>0.99）. The consolidation of sieved soil in the red layer was mainly concentrated in the vertical pressure range from 12.5 to 800 kPa. When the vertical pressure exceeded 800 kPa， the sieved silty clay in the red layer was applicable as the soil-protecting layer in the impervious system of landfill. Meanwhile， based on the existed seepage model（lgkv-lge）， two types of linear and nonlinear fitting seepage models（lgkv-lgρsat） were constructed for the red-layer soil with different particle sizes. It was expected to provide a theoretical guidance on site selection of construction projects such as landfills in the red layer areas， as well as the pollution assessment and remediation of groundwater in China.

Key words: red layer, liner soil, saturated density, anti-seepage performance, landfill