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Related Experiment Videos

A numerical study of soil cover performance.

Ernest K Yanful1, S Morteza Mousavi, Lin-Pei De Souza

  • 1Geotechnical Research Centre, Department of Civil and Environmental Engineering, The University of Western Ontario, London, ON, Canada. eyanful@eng.uwo.ca

Journal of Environmental Management
|March 25, 2006
PubMed
Summary

Designing effective soil covers for reactive mine waste involves balancing performance and cost. This study simulates cover systems to optimize layer types, thicknesses, and hydrogeologic parameters for reduced oxygen flux and acid generation.

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Area of Science:

  • Geotechnical Engineering
  • Environmental Engineering
  • Hydrogeology

Background:

  • Reactive mine waste requires effective decommissioning strategies to prevent environmental contamination.
  • Soil cover systems are crucial for isolating waste, but their performance depends on design and hydrogeologic factors.
  • Predicting cover performance relative to implementation cost is essential for economically feasible solutions.

Purpose of the Study:

  • To simulate and assess the performance of one-dimensional, moisture-retaining soil cover systems for reactive mine waste.
  • To investigate the influence of various cover properties and hydrogeologic parameters on cover performance, particularly oxygen flux.
  • To develop a method for site-specific, cost-effective design of multi-layer cover systems.

Main Methods:

Related Experiment Videos

  • One-dimensional transient flow modeling using the SoilCover software.
  • Simulation of evaporation and computation of suction and water content profiles.
  • Estimation of oxygen diffusion coefficients and oxygen flux based on predicted water content and porosity.
  • Analysis of the relationship between oxygen flux and maximum acid flux.

Main Results:

  • The relationship between water table depression, capillary layer thickness, and barrier desaturation is non-linear.
  • Oxygen flux is influenced by barrier thickness, with performance improvements correlating with increased cost.
  • Cover design parameters significantly impact the overall effectiveness in mitigating acid generation.

Conclusions:

  • Optimizing multi-layer soil cover design requires careful consideration of hydrogeologic conditions and material properties.
  • A site-specific design approach is necessary to balance cost and performance for reactive mine waste decommissioning.
  • The study provides a framework for evaluating cover system designs to minimize environmental risk.