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.
Similar content being viewed by others
References
FADDENKOV N.N.,et al., (1978): Estimation of the Ore Block Size. Fiz.-Techn. Probl. Raz. Polesn. Iskop., No. 1, pp. 43–49 (in Russian).
JEREMIC M.L. (1980): Coal Strength in the Rocky Mountains. World Coal, Vol. 6, No. 9, pp. 41–44.
JEREMIC M.L. (1980): Characteristics of Western Canadian Coal Seams and Their on Mine Design. Mining Magazine, December, London, pp. 557–564.
JEREMIC M.L. (1981): Canadian Coal Reserves are Plentiful Unevenly Distrivuted. World Coal, Vol. 7, No. 5, pp. 42–45.
JEREMIC M.L. (1982): Internal Structure of Coal Seams and Mechanical Stability. CIM Bulletin, Vol. 75, No. 841, pp. 71–75.
PROTODYAKONOW M.M. (1958): Investigations on the Brittleness and Viscosity of Coals. Ugletekhizdat, Moskow (in Russian).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
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
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02594202