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<p>Elevated temperatures within landfills, generated by microbial biodegradation of organic waste, pose a significant threat to the integrity of waste containment facilities. Thermally induced mechanical degradation of Municipal Solid Waste, MSW, can lead to slope failures and final cover ruptures. These failures present severe environmental risks, including leachate release and amplified greenhouse gas emissions. Despite these critical implications, the specific impact of temperature on MSW's shear behavior has remained unexplored. This study addresses this knowledge gap through a comprehensive laboratory investigation. Seventy-five drained and undrained triaxial tests were performed on MSW samples, incorporating plastic contents of 0, 12, and 24%. Tests were conducted under confining pressures of 50, 150, and 300&#xa0;kPa and at temperatures of 25, 45, 65, and 95&#xa0;°C. The results demonstrate that MSW shear strength decreases significantly with increasing temperature. A substantial reduction of up to 55% was observed at 95&#xa0;°C. Furthermore, elevated temperatures induced a fundamental shift in the mechanical response: the characteristic upward concave strain-hardening behavior transitioned to a hyperbolic shape. This transition is attributed primarily to the thermal degradation of plastic fibers, which reduces their tensile strength and stiffness, thereby diminishing their crucial reinforcement role within the waste matrix. To quantify these temperature-dependent effects, a modified Mohr–Coulomb model was developed. The model confirmed that both the friction angle and cohesion of MSW decrease as temperature rises. Additionally, temperature elevation was found to increase the compressibility index, <i>λ</i>, and reduce the rebound index, <i>κ</i>. Crucially, for reliable stability analysis in scenarios involving elevated temperatures (e.g., bioreactor landfills or thermally active zones), the findings indicate that Skempton’s (Sel Pap Soil Mech 106–118, 1961) pore pressure parameter “A” must be calibrated for temperature, fiber content, and mean stress. This calibration is essential for accurate effective stress analysis, enabling resilient containment design to mitigate the risks of environmental contamination.</p>

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Impact of temperature on municipal solid waste mechanics: a geotechnical and environmental perspective

  • 期刊论文

  • 发表日期：

    2025年12月11日

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  • B. Yazdanpour,
  • M. Karimpour-Fard,
  • M. Sabermahani,
  • S. Lemos Machado

摘要

Elevated temperatures within landfills, generated by microbial biodegradation of organic waste, pose a significant threat to the integrity of waste containment facilities. Thermally induced mechanical degradation of Municipal Solid Waste, MSW, can lead to slope failures and final cover ruptures. These failures present severe environmental risks, including leachate release and amplified greenhouse gas emissions. Despite these critical implications, the specific impact of temperature on MSW's shear behavior has remained unexplored. This study addresses this knowledge gap through a comprehensive laboratory investigation. Seventy-five drained and undrained triaxial tests were performed on MSW samples, incorporating plastic contents of 0, 12, and 24%. Tests were conducted under confining pressures of 50, 150, and 300 kPa and at temperatures of 25, 45, 65, and 95 °C. The results demonstrate that MSW shear strength decreases significantly with increasing temperature. A substantial reduction of up to 55% was observed at 95 °C. Furthermore, elevated temperatures induced a fundamental shift in the mechanical response: the characteristic upward concave strain-hardening behavior transitioned to a hyperbolic shape. This transition is attributed primarily to the thermal degradation of plastic fibers, which reduces their tensile strength and stiffness, thereby diminishing their crucial reinforcement role within the waste matrix. To quantify these temperature-dependent effects, a modified Mohr–Coulomb model was developed. The model confirmed that both the friction angle and cohesion of MSW decrease as temperature rises. Additionally, temperature elevation was found to increase the compressibility index, λ, and reduce the rebound index, κ. Crucially, for reliable stability analysis in scenarios involving elevated temperatures (e.g., bioreactor landfills or thermally active zones), the findings indicate that Skempton’s (Sel Pap Soil Mech 106–118, 1961) pore pressure parameter “A” must be calibrated for temperature, fiber content, and mean stress. This calibration is essential for accurate effective stress analysis, enabling resilient containment design to mitigate the risks of environmental contamination.