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Experimental investigation of a contained explosion of elongated charges

  • Rock Mechanics and Rock Pressure
  • Published:
Soviet Mining Aims and scope

Conclusions

  1. 1.

    The best material for stemming is hard rock chips, with coarseness 3–10 mm.

  2. 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. 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. 4.

    Fracturing of the massif decreases inversely proportionally, with the square of the distance from the axis of the charge.

  5. 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. 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.

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Literature Cited

  1. É. O. Mindeli, P. A. Demchuk, and V. A. Aleksandrov, Stemming of Blasting Holes [in Russian], Nedra, Moscow (1967).

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  2. F. A. Baum and N. S. Sanasaryan, “Explosion pulses due to the lateral thrust of the stemming in a borehole,” Vzryvnoe Delo, No. 59/16 (1966).

  3. G. P. Demidyuk, The Role and Effectiveness of Stemming in the Conduct of Blasting Operations [in Russian], Nedra, Moscow (1965).

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  4. M. I. Gorbunov-Posadov, Stability of Foundations on a Sandy Base [in Russian], Stroiizdat, Moscow (1962).

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  5. A. L. Isakov and V. P. Kokovkin, “Model investigations of the behavior, of stemming and the calculation of the pulse during the explosion of borehole charges,” Fiz. Tekh. Probl. Razrab. Polezn. Iskop., No. 4 (1974).

  6. E. N. Sher, “Estimation of the crushing action of an elongated charge in a brittle medium,” Fiz. Tekh. Probl. Razrab. Polezn. Iskop., No. 1 (1975).

  7. V. A. Babakov and É. P. Taran, “Calculation of the stress field during the explosion of elongated charges,” Fiz. Tekh. Probl. Razrab. Polezn. Iskop., No. 5 (1976).

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Authors
  1. B. G. Tregubov
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  2. É. P. Taran
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  3. Ya. A. Balagur
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  4. N. E. Trufakin
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Additional information

Institute of Mining, Academy of Sciences of the SSSR, Siberian Division, Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 55–62, November–December, 1981.

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Tregubov, B.G., Taran, É.P., Balagur, Y.A. et al. Experimental investigation of a contained explosion of elongated charges. Soviet Mining Science 17, 532–538 (1981). https://doi.org/10.1007/BF02497991

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  • DOI: https://doi.org/10.1007/BF02497991

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