فهرست نشریات علمی دسترسی آزاد ایران

The chemical decomposition of Municipal Solid Waste (MSW), including processes like methanogenesis and acidogenesis, significantly influences landfill behavior by generating gases and leachate that alter internal conditions. These chemical changes affect key geotechnical parameters such as unit weight, shear strength, and pore pressure, directly impacting landfill slope stability over time. As organic matter degrades, reductions in strength and increases in gas and leachate pressures can trigger settlement and slope failure. Therefore, integrating chemical analysis with geotechnical evaluation is essential for accurately assessing long-term stability and mitigating risks in landfill design. This study investigates the stability and settlement behavior of a landfill slope after adding four 5-meter-thick layers of MSW, totaling 20 meters of surcharge, leading to a significant collapse. Using displacement data for Points A, B, and C—located at the toe, near the crest, and below the new MSW layer, respectively—we analyzed settlement patterns under varying load multipliers. Graph results reveal increasing displacement with depth and load, reflecting greater instability near the slope’s top. This reveals severe compression and failure beneath the surcharge, which extended up to 15 meters. The "Young" MSW’s low stiffness and weak shear strength, combined with rapid vertical loading, caused excessive consolidation, lateral movement, and a deep-seated rotational failure.