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<p>Using a proper constitutive model is mandatory in the stress-strain analysis of landfills and dumpsites. However, it is a challenging task due to the limited knowledge of the mechanical behavior of Municipal Solid Waste, MSW. Thermal energy is released during the digestion process of MSW in landfills, causing temperature elevation within the waste mass. Only a few experimental studies have been performed on the effect of temperature elevation on the geotechnical properties of the MSW. Therefore, no thermo-mechanical constitutive model has yet been tested under such conditions. The current paper investigates the temperature dependency of MSW’s geotechnical properties used in the constitutive model developed by Machado et al. (J Geotech Geoenviron Eng 128:940–951, 2002). Using a temperature-controlled large triaxial apparatus, 33 drained triaxial tests and 9 isotropic compression tests on samples with fiber contents of 0, 12, and 24% and at temperatures of 25 °C, 45 °C, 65 °C, and 95 °C were conducted. MSW’s shear strength parameters and deformation coefficients, in the form of internal friction angle, f, cohesion intercept, c, and compressibility and rebound index, l and k, were estimated. Additionally, 18 extension tests were performed on the plastic fibers to investigate the temperature dependency of the reinforcement effect of plastic fibers within MSW. Increasing the temperature inside the samples, however, increases the compressibility index but decreases the rebound index of MSW. The results also revealed that the temperature elevation decreases plastic fibers’ tensile strength and stiffness. It is the main reason for diminishing the strain hardening and transforming the shape of the mechanical response of MSW under shearing into a hyperbolic function form. The results showed a paramount impact of temperature elevation on MSW’s mechanical properties; therefore, modifying the original constitutive model parameters for elevated temperature seems to be necessary for the correct modeling of the mechanical response of waste mass.</p>

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Investigating the Effects of Temperature Elevation on the Geotechnical Properties of Municipal Solid Waste

  • 期刊论文

  • 发表日期：

    2025年11月24日

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  • Bahador Yazdanpour,
  • Mohsen Sabermahani,
  • Mehran Karimpour-Fard,
  • Sandro Lemos Machado

摘要

Using a proper constitutive model is mandatory in the stress-strain analysis of landfills and dumpsites. However, it is a challenging task due to the limited knowledge of the mechanical behavior of Municipal Solid Waste, MSW. Thermal energy is released during the digestion process of MSW in landfills, causing temperature elevation within the waste mass. Only a few experimental studies have been performed on the effect of temperature elevation on the geotechnical properties of the MSW. Therefore, no thermo-mechanical constitutive model has yet been tested under such conditions. The current paper investigates the temperature dependency of MSW’s geotechnical properties used in the constitutive model developed by Machado et al. (J Geotech Geoenviron Eng 128:940–951, 2002). Using a temperature-controlled large triaxial apparatus, 33 drained triaxial tests and 9 isotropic compression tests on samples with fiber contents of 0, 12, and 24% and at temperatures of 25 °C, 45 °C, 65 °C, and 95 °C were conducted. MSW’s shear strength parameters and deformation coefficients, in the form of internal friction angle, f, cohesion intercept, c, and compressibility and rebound index, l and k, were estimated. Additionally, 18 extension tests were performed on the plastic fibers to investigate the temperature dependency of the reinforcement effect of plastic fibers within MSW. Increasing the temperature inside the samples, however, increases the compressibility index but decreases the rebound index of MSW. The results also revealed that the temperature elevation decreases plastic fibers’ tensile strength and stiffness. It is the main reason for diminishing the strain hardening and transforming the shape of the mechanical response of MSW under shearing into a hyperbolic function form. The results showed a paramount impact of temperature elevation on MSW’s mechanical properties; therefore, modifying the original constitutive model parameters for elevated temperature seems to be necessary for the correct modeling of the mechanical response of waste mass.