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Atmospheric Controls on Gas Flow Directions in a Waste Rock Dump.

Lahmira, Belkacem; Lefebvre, René; Hockley, Daryl E.; Phillip, Mark (2014). Atmospheric Controls on Gas Flow Directions in a Waste Rock Dump. Vadose Zone Journal , vol. 13 , nº 10. p. 1-17. DOI: 10.2136/vzj2014.03.0032.

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Résumé

The Sullivan Mine No. 1 Shaft waste rock dump was built on a natural slope and covered by till. The outflow of O-₂-deficient gas through a leachate drainage pipe in an enclosure at the base of the dump resulted in four fatalities. A numerical model was developed to understand the mechanism controlling gas flow, which was found to be the relative buoyancy of the gas phase within the dump compared with atmospheric air. Changes in atmospheric air density are caused by atmospheric temperature variations, whereas dump gas-phase density is relatively constant due to a steady internal dump temperature. When the air temperature is lower than the internal dump temperature, atmospheric air density is higher than the dump gas density, inducing upward dump gas flow and air entry into the drainage pipe. Downward dump gas flow occurs and exits the drainage pipe when high atmospheric temperature leads to an air density lower than the dump gas density. A gas flow behavior similar to what was observed at the No. 1 Shaft dump could occur in other covered dumps.

Type de document: Article
Mots-clés libres: air; atmospheric movements; atmospheric pressure; atmospheric thermodynamics; density of gases; flow of gases; gases; mine shafts; numerical models
Centre: Centre Eau Terre Environnement
Date de dépôt: 18 avr. 2018 13:14
Dernière modification: 18 avr. 2018 13:14
URI: http://espace.inrs.ca/id/eprint/3768

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