Experimental investigation of a contained explosion of elongated charges

Autor: Ya. A. Balagur, É. P. Taran, B. G. Tregubov, N. E. Trufakin
Rok vydání: 1981
Předmět:
Zdroj: Soviet Mining Science. 17:532-538
ISSN: 1573-8736
0038-5581
DOI: 10.1007/bf02497991
Popis: 1. The best material for stemming is hard rock chips, with coarseness 3–10 mm. 2. The length of stemming, such that it is not ejected from the borehole, amounts to 140–150 r0, but its length can be reduced somewhat, as even in the case of ejection of the stemming the zone of shattering is almost unchanged, but destruction of the mouth of the borehole occurs. 3. The average radius of the zone of crushing in hard rock amounts to approximately 9 r0, and the radius of intense fracture formation attains 18 r0. 4. Fracturing of the massif decreases inversely proportionally, with the square of the distance from the axis of the charge. 5. With the interaction of contained charges, arranged at an optimum distance of 15–20 r0, the zone of shattering is increased approximately by a factor of one and a half, by comparison with a single charge. 6. The volume of the experimental work carried out and their results may serve as sufficient basis for creating a new technology of cutting mine workings in hard and stable rocks.
Databáze: OpenAIRE
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