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Study of blasting fatigue in rocks

  • Rock Breaking
  • Published:
Soviet mining science Aims and scope

Conclusions

  1. 1.

    It has been established that preliminary repeated loading even with low energy consumption compared with crushing energy creates fatigue microcracks in the solid mass and this promotes improved quality for disintegration by basic blasting charges.

  2. 2.

    It has been established that the effect of blasting fatigue on disintegration quality is extreme in nature in contrast to the ultimate strength which decreases asymptotically with increasing number of cycles.

  3. 3.

    It has been demonstrated that in contrast to fatigue with mechanical cyclic loading developing after hundreds or thousands of cycles, blasting fatigue develops markedly after a few cycles, and this makes it possible to use this effect during disintegration by blasting.

  4. 4.

    A method has been developed for realizing the fatigue phenomenon under production blasting conditions providing improved disintegration quality by 30–50% with the same energy consumption or a reduction in energy consumption by a factor of 1.5 with a given disintegration quality.

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Literature Cited

  1. É. O. Mindeli, M. P. Mokhnachev, and N. V. Gromova, Study of Strength and Deformation Properties of Rocks with Specific Repeated and Shock Dynamic Loads [in Russian], Izd. IGD im. A. A. Skochinskogo, Moscow (1970).

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  2. M. P. Mokhnachev, Fatigue of Rocks [in Russian], Nauka, Moscow (1979).

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  3. Yu. Nisimatsu and R. Kheroesvoe, “Effect of mean stress and stress amplitude on rate constants for the fatigue of rocks,” Dzaire,20, No. 209 (1971).

  4. É. O. Mindeli and M. P. Mokhnachev, “Resistance of rocks to disintegration under dynamic loading,” Gorn. Zh., No. 5 (1971).

  5. E. I. Shemyakin, V. I. Revnivtsev, N. N. Faddeenkov, and A. S. Petrov, “An approach to the evaluation of energy consumption in ore disintegration,” Obogashchenie Rud, No. 6 (1981).

  6. N. N. Faddeenkov, N. E. Trufakin, and E. I. Shemyakin, “Mathematical description of disintegration of ore with a hierarchic effect structure,” Fiz. -Tekh. Probl. Razrab. Polezn. Iskop., No. 6 (1980).

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Authors and Affiliations

  1. Scientific-Research Institute of Ore Mining, Krivoi Rog, Ukraine

    Yu. S. Mets

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  1. Yu. S. Mets
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Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 42–47, January–February, 1983.

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Mets, Y.S. Study of blasting fatigue in rocks. Soviet Mining Science 19, 37–42 (1983). https://doi.org/10.1007/BF02497962

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  • DOI: https://doi.org/10.1007/BF02497962

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