Conclusions
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1.
Pulsed x-ray photography enables us to determine the profile of the shock wave in a graph of mass velocity vs time at distances of 1–3 times the charge radius from its center in rocks of various acoustic impedances.
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2.
The quantity of energy transmitted to the rock in the blast is a considerable fraction of the potential energy of the explosives and increases with the power (detonation velocity) of the explosives in rocks of various hardnesses.
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3.
In breaking rocks with high acoustic impedance, it is advisable to increase the energy transfer factor from the explosives to the rock by increasing the charge power.
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Additional information
G. V. Plekhanov Leningrad Mining Institute. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 45–49, March–April, 1974.
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Khanukaev, A.N., Belyatskii, V.P. The close-range zone in rock blasting. Soviet Mining Science 10, 154–158 (1974). https://doi.org/10.1007/BF02501809
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DOI: https://doi.org/10.1007/BF02501809