Blasting processing method for underground hanging arch

Abstract

The invention discloses a blasting processing method for an underground hanging arch. After the hanging arch is generated, the position of the maximum distance away from the center of an access extraction roadway is determined, and the position, corresponding to the position, of a deep hole in the first row behind the hanging arch is a detonation point position; and the detonation point serves asa middle point, 3-4 middle-depth holes on each side are selected, a double-detonation-bomb charging mode with the same section is adopted, a hole bottom detonation bomb loading mode is adopted for theother remaining middle-deep holes in the same row, and the hanging arch is subjected to collapse treatment through the micro-differential explosion between the same row of holes. By the adoption of the method, normal blasting recovery of the middle-deep holes in the rear row is achieved, the middle-deep holes in the front row are not damaged, the equipment production cost is reduced, the influence of the hole repairing process of the rock drilling equipment and the influence of the hanging arch on the production arrangement is reduced, and the like, the normal recovery of a stope is guaranteed, and the safety of production and operation personnel is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of mining, in particular to a blasting treatment method for underground suspended ceilings. Background technique [0002] In the mining process using the segmental caving method without pillars, the blasting back mining is from top to bottom according to the height of the segment, and according to the regulations that the blasting of the upper segment roadway is ahead of the corresponding roadway of the lower segment by more than 5 rows, the method of medium and deep hole blasting is adopted. Carry out mining; during the mining operation, due to reasons such as the quality of the middle and deep holes not up to the standard, improper charging operation, etc., it will lead to suspended roofs in the approach. The overhang means that the caving height of this section has not reached the design height, and the top ore rock was not put down after blasting. [0003] After the overhang occurs, if the mining contin...

AI Technical Summary

Problems solved by technology

In actual operation, in order to ensure the safety of repairing workers, the opening position of the deep hole in the inclined sector can only be arranged in the 3 to 4 rows behind the eyebrow line. There are three main problems in this way of dealing with the suspended ceiling: ① Repairing The hole will cause damage to the middle and deep holes in the front 3~4 rows, resulting in perforation; ②It usually takes at least 7 days to complete the hole repair (including site cleaning, rock drilling equipment call, re-laying of Fengshui pipeline, on-site empty field measurement, medium and deep hole design and construction, etc.), seriously affecting the implementation of the recovery plan at this level

③ Unexploded explosives are likely to remain in the residual holes in the suspended roof area, and the deep holes in the inclined fan shape may penetrate the residual holes, and there are certain risk factors

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