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A laboratory study on reducing the quantity of rock fines at failure: application to rock blasting and crushing

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Abstract.

This paper presents laboratory work to determine whether decreasing the strength of rock through water-saturating the specimens can reduce the amount of generated fines at failure. Three types of rocks were tested using the indirect tensile (Brazilian) test. The samples were randomly divided into two groups of gneiss, diorite and diabase (dolerite), one group of each rock type being tested in dry and the other in saturated conditions. The results indicated that the dry samples produced both higher tensile strength values and more fines than the saturated specimens.

Résumé.

Cet article présente un travail de laboratoire visant à déterminer si la diminution de résistance d’une roche, obtenue par saturation, permet de réduire la quantité de poussières produites à la rupture. Trois types de roches ont été testés à l’aide de l’essai de traction indirecte (essai brésilien). Des échantillons de gneiss, diorite et diabase (dolérite) ont été partagés en deux groupes, ceux du premier groupe étant testés en conditions sèches, ceux du deuxième groupe en conditions saturées. Les résultats ont montré que les échantillons secs présentaient des valeurs de résistance à la traction plus importantes et produisaient plus de fines que les échantillons saturés.

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Bohloli, B., Gustafson, G. & Ronge, B. A laboratory study on reducing the quantity of rock fines at failure: application to rock blasting and crushing. Bull Eng Geol Environ 60, 271–276 (2001). https://doi.org/10.1007/s100640100102

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  • DOI: https://doi.org/10.1007/s100640100102

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