Abstract
Aiming at the problem of impact ground pressure caused by the hard roof of goaf in coal mining face, the research on pre-cutting of hard coal seam roof by directional blasting was carried out. According to the principle of energy accumulation in directional blasting, a similar simulated experiment was designed on the basis of theoretical analysis of stress wave propagation law, crack development law and forced roof caving distance. The experimental results show that the roof is pre-cut by directional blasting, the integrity of the roof in front of the working face is reduced, effective pressure relief effect is obtained, the large area of overhanging roof in goaf is prevented, and the impact ground pressure disaster of the working face is relieved.
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