Air-spaced explosive charging structure and air-spaced explosive charging method

Abstract

The invention relates to an air-spaced explosive charging structure and an air-spaced explosive charging method, and belongs to the technical field of blasting. The air-spaced explosive charging structure comprises a gravel layer, a plurality of explosive charging layers, a plurality of spacing layers, a blasthole protector and a stemming filling layer. The gravel layer is arranged at the bottom of a blasthole; the explosive charging layers and the spacing layers are alternately arranged; the explosive charging layers are arranged at the top of the gravel layer; the spacing layers are water bottle air spacers; the blasthole protector is arranged at the blasthole; and the stemming filling layer is arranged in the blast hole protector of the blasthole in a filling manner. According to the air-spaced explosive charging structure, the explosive charging speed is high, the explosive charging process is simple, the blasting cost is low, and the air-spaced space is large; after explosives explode, opposite impact waves are excited in an air column and explosion is carried out in the center of the air column, so that the pressure is increased, and the impulse of stress waves transmitted torock is increased; and meanwhile, shock waves reciprocate and collide repeatedly, the action time of the shock waves is prolonged, detonation wave peak pressure is reduced, a smashing area is reduced, the effective energy utilization rate of explosives is increased, and the blasting effect is improved.

Description

technical field [0001] The invention relates to an air-interval charging structure and a charging method, belonging to the technical field of blasting tests. Background technique [0002] Underground downward large-diameter deep-hole blasting mining technology is more and more favored by underground mining enterprises because of its high recovery efficiency, good safety, and low investment cost, and it is also the development trend of underground mining in the future. When blasting charge, the charge structure is divided into continuous charge and interval charge. Due to the excessive concentration of explosives in continuous charge, the rocks are often broken too much, and the consumption of explosives is large. The interval charging can effectively improve the utilization rate of blasting explosives, reduce the amount of charge, and make the blasting energy evenly distributed on the wall of the blast hole, and the blasting effect is better. [0003] At present, most of t...

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Problems solved by technology

[0005] The present invention aims at the current problems such as high cost of sand and gravel intervals, poor blasting effect, complicated charge process, and high price of ordinary air spacers, and proposes an air-spaced charge structure and charge method. The explosive process is simple, and the blasting cost is low. Compared with the previous sandstone, bamboo tube or other air spacers, it saves cost and simplifies the charge industry; Opposite shock waves are excited in the air column, and explode in the center of the air column, increasing the pressure and increasing the impulse of the stress wave to the rock; at the same time, the shock waves go back and forth and collide multiple times, increasing the shock wave action time and reducing the peak pressure of the detonation wave , reduce the crushing area, increase the effective energy utilization rate of explosives, and improve the blasting effect

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