First, the scope of application:

1. Deep hole blasting in open pit mine blasting engineering;

2. If the diameter of the blasthole is above 90 mm and the deep hole is above 10 m, the bottom or middle spacing can be used, and the interval length is 15%-30% of the continuous column charge.

Second, the main role

Reduce the unit consumption of explosives, absorb shock and waterproof, reduce the base; reduce the explosion pressure in the blasthole, use the uncoupling charge process to impact the rock crushing, expand the range of the rupture zone, improve the effective utilization rate of the blasting energy of the explosive, thereby reducing the explosive consumption . save costs.

Its working principle has the following points:

1. The shock wave generated by the explosive explosion reflects a second strain wave in the bore, so that the fracture network around the bore expands before the gas is boosted. Although the pressure of the gas generated by the explosive in the explosion is reduced, under the repeated action of the series of aftershocks, the shock wave increases the time of the rock by 1-4 times, which increases the degree of rock fragmentation.

2. There are four kinds of air separation technology in cavity blasting: hole bottom interval, middle interval, top interval, and uncoupled interval.

Third, the blasting effect and analysis

After blasting, the explosive pile is loose, the surface nuggets are relatively uniform, the bulk is small, and the eyebrow line is tidy after blasting. Main features: Safe and convenient for storage and transportation. Because there is no use of high-pressure gas tanks, there is no safety hazard during transportation or storage. The spacer can be placed in a high temperature or low temperature environment without affecting the use, and the operation is simple, which is advantageous for improving production efficiency.

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