Strip mine high-step large-aperture buffer blasting method
A technology for large-aperture and open-pit mines, applied in blasting and other directions, can solve the problems of large receiving space, low pre-split blasting efficiency of small-aperture, and many types of mining rigs, so as to improve operational safety, reduce instability risks, and reduce The effect of single-hole charge
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[0023] like figure 1 and 2 As shown, a buffer blasting method with high steps and large apertures in an open-pit mine, except for the last row of buffer holes 6 on the merged step 2 of the open-pit mine, the rest of the normal blast holes 3 are arranged in a triangular manner, and the hole network parameters are according to Row spacing 5×hole spacing 4=(5.0~5.5)m×(15~16)m, ultra-deep setting is 2~2.5m according to lithology, and the hole spacing of buffer hole 6 is 1 / 4 of that of normal hole 3 ~2 / 3, the buffer hole 6 is not set to be super deep; drill a 310mm large-diameter blast hole with a roller drill, and after the blast hole is accepted, the buffer hole 6 is divided into three stages from bottom to top with air intervals; normal blast holes 3. The charge is divided into two stages with air intervals, and all blastholes are filled and detonated by hole-by-hole detonation after connecting the wires. On the 24.0m high step of the merged section, the comprehensive technolo...
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