METHOD OF BREAKING UP BY EXPLOSIVES ORE FROM SOLID MASS WITH LAYERED TEXTURE Russian patent published in 2014 - IPC F42D3/04 

FIELD: mining.

SUBSTANCE: invention relates to the mining industry, and in particular to methods of breaking up by explosives ore from solid mass with a layered texture and a developed system of fracturing. The method comprises drilling parallel rows of vertical wells at an angle χ to the line of the inner edge of the ledge, loading the wells with high explosive charges (HE), the mounting of downhole and surface blasting networks and row short-delay blasting of HE charges to form in each row of a plane detonation wave of compression. The angle χ is determined from the formula: $$\chi ={\left(-1\right)}^n\frac{\pi }{2}+\frac{{\theta }_1+{\theta }_2}{2}+{\left(-1\right)}^{n+1}\gamma -\arcsin \left(ctg\frac{{\alpha }_1+{\alpha }_2}{2}\cdot tg\psi \right),$$ deg., where π is the - angle equal to 180°; n is the index of direction of breaking, n=1 in case of direction of breaking from left to right at the sight of the inner edge of the ledge, and n=0 in case of direction of breaking from right to left with the same view; θ₁ is the angle between the line of the crack extension of the main fracturing of the solid mass and the line of the inner edge of the ledge, deg.; θ₂ is the angle between the line of extension of ore layers and the line of inner edge of the ledge, deg.; γ is the angle between the line of rows of wells and the line of intersection of the plane of the front of the explosion wave of compression with the horizontal plane, deg.; α₁ is the angle of incidence of the cracks of main fracturing of the solid mass, deg.; α₂ is the angle of incidence of the layers of ore, deg.; ψ is the angle between the plane of the front of the explosion wave of compression and the vertical, deg.

EFFECT: invention enables to improve the efficiency of strength degradation of intergranular bonds of ore due to the development of microcracks of separation, oriented along both layers of ore, and the planes of major fracturing of the solid mass, and the technical and economic indicators of the subsequent redistribution of ore.

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