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Related Concept Videos

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Simulating Temperature in a Soil Incubation Experiment
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Wedge method for landfill stability analysis considering temperature increase.

Gaojie Xu1, Jianyong Shi1, Yang Yang1

  • 1Key laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, China.

Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA
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Rising landfill temperatures decrease waste and liner strength, impacting slope stability. A new wedge method accounts for temperature effects, crucial for landfill design and management.

Keywords:
Temperature distributionfactor of safetylandfill slopeshear strengthwedge method

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Area of Science:

  • Geotechnical Engineering
  • Environmental Engineering
  • Waste Management

Background:

  • Landfill temperature increases due to biochemical degradation, reducing the shear strength of waste and liners.
  • This reduction in shear strength can lead to slope instability in landfills.
  • Existing analysis methods often fail to simultaneously consider temperature effects on both waste and liner strength.

Purpose of the Study:

  • To develop a novel wedge method for translational failure analysis in landfills that incorporates temperature-dependent strength parameters of waste and liners.
  • To evaluate the impact of rising landfill temperatures on slope stability, considering different landfill zones and leachate levels.

Main Methods:

  • Established a wedge method for translational failure analysis based on temperature-dependent strength parameters of landfill liners and waste solids.
  • Analyzed the influence of temperature increases on the anti-slide force of landfill slopes.
  • Incorporated leachate levels into the analysis to assess their combined effect with temperature on landfill stability.
  • Validated the proposed method using an engineering case study of the Xiaping Landfill in Shenzhen, China.

Main Results:

  • Rising temperatures significantly reduce the anti-slide force, particularly affecting the back slope more than the bottom slope.
  • The impact of temperature increases on landfill stability becomes more pronounced with higher leachate levels.
  • The developed wedge method demonstrated feasibility and accuracy through the case study validation.

Conclusions:

  • The proposed wedge method provides a more comprehensive approach to landfill slope stability analysis by integrating temperature effects.
  • Temperature increases, especially when combined with rising leachate levels, pose a significant risk to landfill slope stability.
  • The findings offer valuable guidance for the design, operation, and management of municipal solid waste landfills to ensure safety and stability.