Method for improving medium-length hole blasting effect

Abstract

The invention belongs to the technical field of blasting and relates to a method for improving the medium-length hole blasting effect. The method for improving the medium-length hole blasting effect is suitable for blast holes arranged in a sector shape, the blast holes in a sector surface are partitioned and sequentially divided into a region A, a region B and a region C through arc lines, and the region C is close to a rock drilling roadway; according to the region A, high power detonating bombs are adopted for hole bottom detonation, and the detonation explosive unit consumption is controlled to be 0.35; according to the region B, blasting explosives are adopted, the blast holes are filled with the explosives, and the explosive quantity unit consumption is controlled to be 0.48; according to the region C, orifice staggered charging is adopted, the charging coefficient of the blast holes not full of explosives is controlled to be 0.85, and the explosive quantity unit consumption is controlled to be 0.62; and millisecond minute difference blasting is adopted between the blast holes of the same sector surface. The method for improving the medium-length hole blasting effect has thebeneficial effects that explosive blasting energy is distributed reasonably, the charging structures in the blast holes are adjusted, the technologies of orifice staggered charging, hole bottom high-powered explosive detonation, and millisecond minute difference blasting between the holes in the same row are adopted, and thus the medium-length hole blasting quality is improved.

Description

technical field [0001] The invention belongs to the technical field of mine and mine blasting, and relates to a method for improving the blasting effect of medium and deep holes. Background technique [0002] In medium and deep hole blasting, under normal circumstances, the blastholes are arranged in a fan shape, so the blastholes close to the rock drilling roadway are relatively dense, and the blastholes away from the rock drilling roadway are relatively sparse. According to the blasting theory, the higher the unit consumption of explosives, The rock-breaking effect is also better. In fan-shaped medium-deep hole blasting, along the blasthole extension direction, the blasthole density gradually decreases, resulting in a larger charge near the blasthole opening and a smaller charge near the bottom of the blasthole. The blasting effect is uneven, and the bottom is prone to large pieces. Contents of the invention [0003] The object of the invention is to propose a method fo...

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Problems solved by technology

[0002] In medium and deep hole blasting, under normal circumstances, the blastholes are arranged in a fan shape, so the blastholes close to the rock drilling roadway are relatively dense, and the blastholes away from the rock drilling roadway are relatively sparse. According to the blasting theory, the higher the unit consumption of explosives, The rock-breaking effect is also better. In fan-shaped medium-deep hole blasting, along the blasthole extension direction, the blasthole density gradually decreases, resulting in a larger charge near the blasthole opening and a smaller charge near the bottom of the blasthole. The blasting effect is uneven, and the bottom is prone to large pieces

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