Landfill capacity enhancement from a slope inclination perspective and its implementation on the safety factor

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4. Landfill capacity enhancement from a slope inclination perspective and its implementation on the safety factor

This study aims to investigate the impact of slope inclination on landfill capacity and safety factor to enable the construction of larger landfills and extend their lifespan. The geometrically determined capacity change with inclination is examined using a new probabilistic calculation method that considers the heterogeneity of waste layers. Safety factor analysis is carried out for different slope angles, with over 100 calculations for each inclination, to examine the effect of slope variation on the total safety of landfills. The results indicate that capacity increases significantly with the increase of inclination, with waste volume that can be placed increasing by 40% and 25% of the initial volume when passing from 1V:3H to 2V:3H and from 1V:3H to 1V:2H slope angles, respectively. The safety factor results show that, with the use of the conventional method (homogeneous waste) in the calculation, slopes of 1V:3H and 1V:2H are safe. However, the new method allows for consideration of a steeper slope of 2V:3H inclination as safe, especially since the calculation does not consider the safety-enhancing effect of daily cover layers. Based on the analysis presented in this paper, the multi-layered nonhomogeneous calculation method better characterizes the safety factor, as it is closer to representing the real state of landfills. This method provides more permissibility in design parameters, allowing for the construction of safe and cost-effective landfills. This study serves as a significant step forward in landfill construction, and the results have important implications for landfill design and management. Future research could investigate the effects of slope inclination on the consistency of covering layers and rehabilitation to further improve the overall stability of landfill systems.

9th International Congress on Environmental Geotechnics (ICEG2023)

Landfilling