ABSTRACT
The application of vertical isolation barriers to block the migration of pollutants is a common technical method. In this paper, the effects of convection, dispersion, diffusion, and adsorption on the transport of pollutants are comprehensively considered, and the blocking effect of vertical isolation barriers with different permeability coefficients on pollutants is analyzed and studied. With the help of Hydrus-2D software, a two-dimensional coupled model of groundwater seepage and pollutant migration in a chemically polluted site was established. Numerical analysis was used to analyze the migration characteristics of pollutants in groundwater, and to study the barrier effect of isolation barriers on pollutant migration. The results show that in the case of an isolation barrier with an initial concentration of Cd2+ of 0.1 mg/L, a depth of 17 m, a thickness of 1 m, and the Cd2+ pollution concentration of 0.01 mg/L specified in the Groundwater Environmental Quality Standard as the breakdown standard, when the permeability coefficient is 1×10−7cm/s, the breakdown time is 11,663 days (31.95 years); when the permeability coefficient of the isolation barrier is 1×10−8cm/s the breakdown time is 15,460 days (42.36 years).
