Effect of setback distance of leachate recirculation systems on the slope stability of bioreactor landfills
Effect of setback distance of leachate recirculation systems on the slope stability of bioreactor landfills
The present study investigates the impact of leachate recirculation on stability of landfills by conducting numerical modelling using finite element analysis. The validation of the model was carried out and the results were subsequently compared with the previous literature. The leachate recirculation was simulated using the horizontal trench of 1 m × 1 m. The effect of leachate injection on the pore water pressure and slope stability was examined for heterogeneous and anisotropic waste conditions for various injection pressures and slope configurations. The performance of horizontal trenches with different setback distances varying between 5 m - 50 m for various injection pressures was compared, and their effects on landfill slope stability were evaluated. A setback distance of less than 25 m has a significant impact on landfill stability under high injection pressures, primarily because of the influence of pore water pressure on the slope. The results showed that a factor of safety greater than 1.5 was achieved for the optimum range of setback distance of 30 m - 40 m and was found to be suitable across various injection pressures (49 kPa, 98 kPa,147 kPa, and 196 kPa). The outcomes of the present research would help in better understanding the influence of setback distance of leachate recirculation on slope stability and contribute to the improvement of the design of landfills.
L. S Avinash; A. Mishra
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
E - Environment, water and energy
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