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An equivalent-time-lines model for municipal solid waste based on its compression characteristics.

Wu Gao1, Xuecheng Bian1, Wenjie Xu1

  • 1Department of Civil Engineering, MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China.

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Summary

This study developed two models to predict municipal solid waste (MSW) settlement in landfills, considering biodegradation and mechanical creep. The models accurately simulate long-term compression, aiding landfill management and design.

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BiodegradationCompressibilityCreepEquivalent timeMunicipal solid wasteTime-lines model

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Area of Science:

  • Geotechnical Engineering
  • Environmental Engineering
  • Waste Management

Background:

  • Municipal solid waste (MSW) settlement is a time-dependent process influenced by biodegradation and mechanical creep.
  • Accurate prediction of MSW settlement is crucial for landfill capacity and structural integrity.

Purpose of the Study:

  • To develop and validate models for predicting MSW settlement under varying biodegradation conditions.
  • To establish relationships between MSW strain rate, equivalent time, and biodegradation.
  • To differentiate between models suitable for enhanced versus normal biodegradation environments.

Main Methods:

  • Analysis of long-term compression tests on MSW under different biodegradation conditions.
  • Adaptation of the time-lines model for clays to MSW compression characteristics.
  • Development of two equivalent-time-lines models (Type I and Type II) for MSW settlement.

Main Results:

  • Established relationships between MSW viscous strain rate and equivalent time.
  • Developed Type I model for enhanced biodegradation and Type II model for normal biodegradation.
  • Validated models against laboratory and field compression test data, showing high reliability.
  • Identified conditions favoring the applicability of each model based on biodegradation, organic content, and fill age.

Conclusions:

  • The developed equivalent-time-lines models provide reliable predictions for MSW settlement.
  • Type I and Type II models are suitable for distinct biodegradation and mechanical creep scenarios, respectively.
  • Model parameters correlate with landfill fill age, offering insights for long-term performance assessment.