To issue of evaluation of the influence of external pressure and broken condition of a massif on the blast shattering effect by the smoothed particle hydrodynamics method

The present development of mining enterprises requires reducing the humancaused impact of blasting operations and ramp up researches aimed at the digitalization of mining processes and the increasingly widespread use of rock massif disintegration computer simulation methods. The complication of geomechanical conditions associated with deeper field development requires improved calculations of drilling and blasting parameters based on research of patterns of changes in the stress-strain behavior (SSB) and fragmentation of blasted massif with an increase in the rock pressure. This paper describes the results of such researches of how the charge density of explosives of various capacity, external pressure, and broken condition of a massif effect on the fine rock yield, which determines the dust content in the atmosphere after a major blast of a rock massif with an exposed surface. Established is the behavior pattern of the concentration of massif disintegration and stress zones resulting from the blasting impact in the presence and absence of the external pressure. The curves are plotted and the behavior is traced for the dependences of the average piece size and the fine rock yield on the charge density of emulsion and granular explosives. Obtained are the simulation results for the blasting effect of a single charge on a solid massif with a free outer surface and a cracked massif. Demonstrated is the fundamental difference between the concentration of cracks in a solid massif and in a cracked massif, and stresses occurring at different distances from the charge to and between the cracks.The work has been done within the scope of the state-financed subject of the Research Institute of Comprehensive Exploitation of Mineral Resources of the Russian Academy of Sciences.

Efremovtsev N. N., Shipovskii I. E. To issue of evaluation of the influence of external pressure and broken condition of a massif on the blast shattering effect by the smoothed particle hydrodynamics method. MIAB. Mining Inf. Anal. Bull. 2023;(12-1):170—182. [In Russ]. DOI: 10.2 5018/0236_1493_2023_122_0_170.

Efremovtsev N. N., ORCID 0000−0001−5797−1631, Cand. Sci. (Eng.), Senior Researcher, Institute of Comprehensive Exploitation of Mineral Resources, Russian Academy of Sciences, noee7@mail.ru;
Shipovskii I. E., ORCID 0000−0002−7542−3900, Cand. Sci. (Eng.), Senior Researcher, Institute of Comprehensive Exploitation of Mineral Resources, Russian Academy of Sciences, e-mail: iv.ev@mail.ru.

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