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Effect of cumulation on detonation velocity of low sensitivity explosives

Mollova Zdravka

Mining Science

2023

Vol. 30

171--181

In an effort to improve the parameters of the blasting works carried out with low-sensitivity explosives, bearing in mind the studies of the cumulation phenomenon and the modern knowledge of the concentration of energy in a certain direction or place, studies of the detonation speed at different diameters of the charge of the coarse explosives were carried out – Anfo type with intermediate detonator 900 g cast booster with and without cumulative funnel (CF). Tests carried out in landfills and industrial conditions have shown that the type of intermediate detonator significantly affects the detonation speed, and therefore also affects the other explosive characteristics of the explosives. The highest detonation velocity was achieved when the explosives were initiated with cast boosters with cumulative funnels. Tests have shown that when initiating coarse explosives with boosters with CF, stable detonation of the charges is obtained with optimal fragmentation of the material, and the mass of the used explosives is reduced by 14%. Their use in carrying out blasting works with low-sensitivity explosives of the emulsion and coarse-disperse type leads to an increase in the blasting efficiency, achieving better crushing of the rocks and reducing the costs of additional crushing of the non-gauge.