Articles scientifiques

Numerical Evaluation of Effectiveness of Drainwells in Dewatering Overburden at Surface Coal Mines

Abstract:

Typical sedimentary sequences overlying coal seams consist of interbedded sandstones, siltstones, shales, and rider coal seams. In many surface coal mine settings, these sediments are saturated; and prior dewatering of them is necessary for effective and economic mining, including the stacking of saturated spoils. Such sedimentary sections usually have a very low vertical hydraulic conductivity that does not allow them to drain in a timely manner prior to their being stripped. One potential solution is installation of drainwells. Drainwells are small diameter wells that can collect water laterally from the various more permeable layers in the overburden and then gravity drain it to a lower layer – often the coal seam being mined – where it can be removed by pumping wells or sumps located in the bottom of the pit. A ground-water flow model utilizing the 3-dimensional finite element code MINEDW has been used to evaluate the effectiveness of using drainwells in a hydrogeologic setting that is typical of the Powder River Basin. A series of numerical simulations were completed using various combinations and spacings of drainwells and pumping wells to dewater the overburden and coal seams. The numerical simulations suggest that drainwells can be a very effective method of overburden dewatering.

Citation:

Howell, R.L., L.C. Atkinson, and H. Liu. 2000. Numerical evaluation of effectiveness of drainwells in dewatering overburden at surface coal mines. Society for Mining, Metallurgy, and Exploration Annual Meeting, Salt Lake City, Utah, 28 February-1 March.

Authors:

Houmao Liu

Link to Full Text:

Dewatering a Coal Mine.pdf

Dernières Nouvelles
  • Itasca France has moved! Itasca France's office is now located at : 29 Avenue Joannes Masset 69009 Lyon -...
    En savoir plus
  • Nous avons déménagé! Nous sommes désormais basés dans le 9ème arrondissement de Lyon, dans le secteur de Gorge...
    En savoir plus
  • Les licences Web sont désormais disponibles! Les licences Web sont particulièrement adaptées pour les structures avec de nombreux utilisateurs localisés à...
    En savoir plus

Évènements à Venir
2 nov.
JNGG 2020 Lyon
The 10th National Days of Geotechnics and Engineering Geology are co-organized by the GeoMaS laboratory of INSA Lyon, ENTPE and Cerema ... En savoir plus
4 nov.
Computational Geomechanics in Reservoir Engineering Using FLAC and UDEC
The main objective of this course is to demonstrate the implementation of numerical modeling and geomechanics simulation in reservoir e... En savoir plus
2 févr.
ANALYSES OF EMBANKMENT DAMS AND SLOPES USING FLAC
This hands-on, virtual training course is 16 hours total, spread over four days in a 1.5-week period, and covers the analysis of embank... En savoir plus