Breakage of fissured rock by blasting
When charges are exploded in a fissured rock mass, the fragmentation is mainly localized in the directions of maximum contact of the medium with the piece which is broken first. The directions of maximum fragmentation correspond to the maximum velocities and distances of flight.
According to the linear dimensions of the blocks, the crushed volume varies from cruciform to circular shape, being elliptical in vertical section. The degree of crushing and the relative formation of new surface decrease from block to block with increasing distance from the charge. These experiments indicate that the elements of the fissuring are some of the principal criteria in the choice of rational charge parameters and blasting systems.
KeywordsCharge Radius Flight Distance Blast Hole Fissure Rock Model Bench
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- 1.N. F. Zamesov, “Use of the theory of simularity and dimensions in making models of rock crushing by blasting,” in: Problems of Mechanization of Mining Operations [in Russian], Publ. by IGD im A. A. Skochinskogo, Moscow (1963).Google Scholar
- 2.B. N. Kutuzov and Lin Tê-Yü, “The action of an explosion of a charge in a fissured medium,” Gorn. Zh., No. 9 (1962).Google Scholar
- 3.L. I. Baron and G. P. Licheli, Fissuring of Rocks in Breaking Down by Blasting [in Russian], Nedra, Moscow (1966).Google Scholar
- 4.B. G. Rulev and D. A. Kharin, “Seismographs for registering large displacements,” Trudy IFZ AN SSSR, 16/183, Izd-vo AN SSSR, Moscow (1961).Google Scholar
- 5.I. I. Gurvich, Seismic Prospecting [in Russian], Gostoptekhizdat, Moscow (1960).Google Scholar
- 6.J. Rinehart and J. Pearson, Behavior of Metals under Impulsive Loads, Dover (1954).Google Scholar
- 7.T. A. Gevondyan and L. T. Kiselev, Devices for Measuring and Recording Vibrations [in Russian], Mashgiz, Moscow (1962).Google Scholar