FIELD: mining industry.
SUBSTANCE: method includes driving preparatory mines outside area of influence of higher extracted horizon. Angle of full displacements of rocks ψ is determined as well as angle of effect of edge portion of cleaning mine β in edge points of block soil. Preparatory mines of lower horizon pass in unloading areas, which are placed between area of influence of remaining block, limited by angle ψ and area of effect of portion of cleaning mine, limited by angle β.
EFFECT: higher stability.
1 dwg
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