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<p>Leachate recirculation enhances municipal solid waste (MSW) stabilization but elevates pore pressures, reducing effective stress and potentially affecting slope stability. This study presents a comprehensive numerical investigation of the seismic slope stability of bioreactor landfills, considering the combined effects of leachate injection and geogrid reinforcement in heterogeneous and anisotropic waste conditions. The slope geometries ranging from 1&#xa0;V:2.5H to 1&#xa0;V:4H were analyzed under varying injection pressures and three real earthquake ground motions: Chamoli (1999), Loma Prieta (1989), and Bhuj (2001). Geogrids were placed at different vertical spacings (2.5&#xa0;m to 15&#xa0;m), within the layers, on top of the layers, and in alternating MSW layers. Steeper slopes exhibited high sensitivity to reinforcement spacing and elevated injection pressures, with the factor of safety (FOS) decreasing by almost 50% under static conditions. The results show that flatter slopes improve seismic stability by up to 36%, while higher leachate injection pressures reduced FOS by up to 40%. The Bhuj earthquake induced the most severe impact due to its higher intensity. Geogrid reinforcement significantly improved slope stability, with FOS increases ranging from 27 to 55%, depending on slope geometry and seismic loading. A geogrid spacing of ≤ 10&#xa0;m was adequate for flatter slopes, while 5&#xa0;m spacing was required for steeper slopes under seismic conditions. Therefore, the proposed design charts support the selection of safe slope configurations and leachate injection pressures, demonstrating that optimized geometry and geogrid reinforcement can ensure stable, space-efficient landfill embankments in seismic regions.</p>

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Seismic Stability of Geogrid Reinforced Bioreactor Landfill Slopes

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • Lagudu S. Avinash,
  • Anumita Mishra

摘要

Leachate recirculation enhances municipal solid waste (MSW) stabilization but elevates pore pressures, reducing effective stress and potentially affecting slope stability. This study presents a comprehensive numerical investigation of the seismic slope stability of bioreactor landfills, considering the combined effects of leachate injection and geogrid reinforcement in heterogeneous and anisotropic waste conditions. The slope geometries ranging from 1 V:2.5H to 1 V:4H were analyzed under varying injection pressures and three real earthquake ground motions: Chamoli (1999), Loma Prieta (1989), and Bhuj (2001). Geogrids were placed at different vertical spacings (2.5 m to 15 m), within the layers, on top of the layers, and in alternating MSW layers. Steeper slopes exhibited high sensitivity to reinforcement spacing and elevated injection pressures, with the factor of safety (FOS) decreasing by almost 50% under static conditions. The results show that flatter slopes improve seismic stability by up to 36%, while higher leachate injection pressures reduced FOS by up to 40%. The Bhuj earthquake induced the most severe impact due to its higher intensity. Geogrid reinforcement significantly improved slope stability, with FOS increases ranging from 27 to 55%, depending on slope geometry and seismic loading. A geogrid spacing of ≤ 10 m was adequate for flatter slopes, while 5 m spacing was required for steeper slopes under seismic conditions. Therefore, the proposed design charts support the selection of safe slope configurations and leachate injection pressures, demonstrating that optimized geometry and geogrid reinforcement can ensure stable, space-efficient landfill embankments in seismic regions.