摘要：The 2 m thick compacted clay liner with a permeability coefficient of 1 × 10−7 cm/s is required in the Chinese technical specifications about landfills. The processes of chloride ion completely breakthrough low permeability barriers (k ≤ 1 × 10−7 cm/s) were modeled at 50 g in a geo-centrifuge. A measuring system was used to monitor solute velocity and conductivity. The entire process of chloride ion completely breaking through 2 m Kaolin clay liner was modeled successfully, which provided a valuable testing technology for centrifuge modeling of contaminant transport through low-permeable clay. The analyses results indicated the breakthrough time of conservative pollutant for the 2 m clay liner with a hydraulic conductivity of 1.0 × 10−9 m/s under Δhw of 40 m was 1.6 years. As for strongly adsorptive pollutants, the breakthrough time t0.1 increased by 9 times when Rd increased from 1 to 10, which indicates that the effect of Rd on the performance of the liner was significant.
