Contour control blasting method for high and large stope

Abstract

The invention provides a high and large stope contour control blasting method which comprises the following steps: arranging spaced large-diameter empty holes and small-diameter non-coupling charging holes on two boundaries of a side collapse area of a stope to realize uniform splitting and seam forming of a boundary rock mass along the hole length direction so as to achieve the purpose of stope contour control; according to the charging structure of the small-diameter non-coupling charging hole, a semi-cylindrical barrel is adopted to wrap spaced explosives, a detonating tube and a detonating cord are buried in the barrel to avoid abrasion, the explosives are semi-clamped in the barrel and fixed, and the stability in the process of feeding the explosives into a blast hole is improved; explosive and detonating equipment are bound in advance by the multiple semi-cylindrical barrels, and the semi-cylindrical barrels are mutually bound at orifices to be pushed into blast holes in a relay mode, so that the charging efficiency is improved. The large-diameter empty holes and the non-coupling charging holes are arranged at intervals, so that the workload of non-coupling charging is reduced while the contour of the stope is controlled; and a non-coupling charging structure improves the reliability of blasting. According to the method, the blasting control process is optimized, the blasting cost is reduced, the economic benefit is improved, and the method has high practical value.

Description

technical field [0001] The invention relates to the technical field of mining, in particular to a method for controlling blasting of a tall stope profile. Background technique [0002] Among the mine filling mining methods, the open field subsequent filling mining method has the advantages of large production capacity, high degree of mechanization, and low mining cost, and is widely used in the mining of thick and large ore bodies. This mining method usually divides the ore block into the mine house and the ore pillar stope, and the two-step deep hole blasting is recovered; in the one-step mine mining, if the drilling and charge quantity are not properly controlled, the boundary may be over-excavated and under-excavated, and unevenness may occur. Uneven, suspended large blocks from high altitude will affect the ore mining, resulting in concave and convex backfill boundaries during the two-step mining. The disadvantage of adopting the method of reserving the mine wall to avo...

AI Technical Summary

Problems solved by technology

In order to reduce the blasting power while arranging dense blastholes at the boundary, it is necessary to charge the charge at intervals along the long direction of the blasthole. Correspondingly, the disadvantage of this charge method is that the uneven distribution of the charge leads to uneven blasting energy, which affects the smoothness of the boundary. Spend

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