Active-pressure-releasing hole-bottom vacuum spaced charging structure and charging method thereof

Abstract

The invention discloses an active-pressure-releasing hole-bottom vacuum spaced charging structure and a charging method thereof. The charging structure comprises a blast hole (6) and explosive (2). The charging structure is characterized in that a vacuum medium layer (3) is arranged between a blast hole bottom (5) of the blast hole (6) and the explosive (2), and filler (1) is arranged on the upper portion of the explosive (2); and the charging method includes the steps that firstly, the vacuum medium layer (3) is put into the blast hole bottom (5); secondly, the explosive (2) and a detonator are put into the blast hole (6); and finally, a stemming material serves as the filler (1) to plug the blast hole (6) and be tamped. The active-pressure-releasing hole-bottom vacuum spaced charging structure and the charging method have the blasting-crushing effects that the blasting acting time is effectively prolonged, the effective use ratio of the explosive blast energy is increased, the explosive unit consumption is reduced, and therefore the problems that rock at the lower portion of a step is excessively crushed, and the block ratio of rock at the upper portion of the step is relatively high are solved.

Description

technical field [0001] The invention belongs to blasting technology, and in particular relates to an active pressure-relieving hole-bottom vacuum-interval charging structure and a charging method thereof. Background technique [0002] Charge structure has always been a major issue involving the distribution of explosives in the blasthole and the energy utilization of explosives. In order to find a new and reasonable blasting hole charge structure, it is a key problem that needs to be solved urgently for the further development of mine blasting technology. Practical significance. [0003] In the blasting construction process of most open-pit mines, the charging methods in the blast hole are mainly continuous columnar charging method and uncoupled charging method. Continuous columnar charge structure, this method is concentrated in the lower part of the steps, in which the ultra-deep charge accounts for about 20% to 30% of the total charge, and the height of the non-charge a...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an active pressure-relieving hole-bottom vacuum interval charging structure and its charging method to solve the problem of using materials such as water or air as the interval medium in the prior art. Due to the narrow and airtight space in the hole, However, the air or water medium is incompressible, so that the explosive energy cannot be effectively removed in time after the explosion, the crushing effect of the rock in the crushing area is still relatively large, the initial energy consumption is large, and the effective utilization rate of the explosive energy is not high. The overall crushing effect is not good and other problems

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