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Coal strength evaluation from boreholes

Evaluation de la resistance du charbon base sur l'echantillonnage des trous de forage d'exploration

  • International Symposium Soil and Rock Investigation by In Situ Testing
  • Thème 1 Diagraphies and Borehole Parameters, Drilling Tests, Simultaneous or not to the Drilling Process Giving Values of Physical, Geometrical and Geomechanical Characteristics
  • Published:
Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur Aims and scope Submit manuscript

Summary

The exploration boring of the coal fields in Western Canada suggest the possibility of evaluating in-seam coal strength by:

  • - Logging of coal core

  • - Geophysical borehole logging.

  • - Phenomenological observations of boreholes.

Four categories of coal strength and the associated mechanical stability were proposed. There are:

  • - Excessive strength, sudden and violent deformations.

  • - Moderate strength, stable yielding deformations.

  • - Low strength, unstable fracturing.

  • - Very low or no strength, coal extrusion.

The categories of coal could be determined by criteria based on proposed indices.

Résumé

Le forage d'exploration des bassins houillers de l'ouest canadien permet, d'entrevoir la possibilité d'évaluer la résistance des strates charbonneuses par:

  • - Analyse des carrotes de charbon

  • - Analyse des diagraphies différées.

  • - Observations phénoménologiques des trous de forage.

Quatre catégories de résistance du charbon chacune ayant une stabilité mécanique associée, sont proposées:

  • - Résistance excessive avec déformations soudaines et violentes.

  • - Résistance moyenne avec déformations stables et continues.

  • - Faible résistance avec fracturation instable,

  • - Trés faible résistance, extrusion du charbon.

Ces catégories de charbons pourraient être distinguées à l'aide des indices, proposés.

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References

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Jermic, M.L. Coal strength evaluation from boreholes. Bulletin of the International Association of Engineering Geology 26, 95–99 (1982). https://doi.org/10.1007/BF02594202

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  • DOI: https://doi.org/10.1007/BF02594202

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