Step blasting method for eliminating blasting root bottom under slope and ore rock mass bedding

The invention discloses a step blasting method for eliminating a blasting root bottom under a slope surface and an ore rock mass bedding, which comprises the following steps: when the blasting root bottom appears, constructing a row of auxiliary micro-inclined blast holes in the step slope bottom for auxiliary blasting; the auxiliary micro-inclined blast holes incline inwards and downwards, the inclination angle gamma ranges from 3 degrees to 5 degrees, the distance h1 from the hole openings to the root bottom ranges from 100 mm to 200 mm, and the horizontal length l of the blast holes is calculated according to a formula (1). According to the method, the auxiliary micro-inclined blast hole blasting technology is adopted, auxiliary blasting is conducted on the ore rock mass below the step slope surface of the strip mine so as to eliminate the blasting root bottom, and the problems that under the bedding condition of the step slope surface of the strip mine and the ore rock mass, the resistance line of the ste