Deep-hole loosening hydraulic pressure-relief integrated blasting method and device

Abstract

A deep-hole loosening hydraulic pressure-relief integrated blasting device comprises a blasting cartridge, an explosive line, an explosive feeding pipe, a capsule hole-sealing device and a drilling water injection pipe. The front section of the blasting cartridge is conical, the middle section of the blasting cartridge is hollow, explosive is placed in the middle section of the blasting cartridge,an explosive line extending hole is formed in the middle of the tail section of the blasting cartridge, a hollow pipeline is arranged in the middle of the explosive feeding pipe, and the capsule hole-sealing device is arranged on the explosive feeding pipe in a bunched mode. The explosive line passes through the explosive line extending hole and the hollow pipeline to extend out of the tail end of the explosive feeding pipe. During blasting, the deep-hole loosening hydraulic pressure-relief integrated blasting device is put into a drilled hole, the capsule hole-sealing device seals the hole,static pressure water is injected into the drilled hole, then the blasting cartridge is detonated, and finally, the static pressure water is injected into the drilled hole again. According to the deep-hole loosening hydraulic pressure-relief integrated blasting device, integration of explosive placing, hole sealing, water injection and blasting is achieved, and the operation efficiency is high.

Description

technical field [0001] The invention relates to mining equipment, in particular to an integrated blasting method and device for deep hole loosening and hydraulic pressure relief. Background technique [0002] During the mining process of the coal mining face, there are three stress zones in the coal body in front of the working face: the pressure relief zone, the concentrated stress zone and the original stress zone. In the decompression zone, the ground stress and gas pressure are lower than the original value, which is a protective zone to prevent the outburst. In the concentrated stress zone, the radial stress is smaller than the original in-situ stress, but the tangential stress is greater than the original in-situ stress, and the air permeability of the coal seam decreases sharply. For high-gas coal seams with the risk of coal and gas outburst, it is difficult to leak coal gas. High gas pressure may be maintained, and once suddenly exposed, outburst is likely to occur....

AI Technical Summary

Problems solved by technology

In this blasting method, since the water only exists in the water bag and does not penetrate into the cracks in the rock formation, the blasting can only loosen the limited rock formation around the drill hole, but not the entire rock formation around the drill hole, and its sealing is only by The fixed ring is blocked. During blasting, it is easy to make water and blasting gas rush out from the drill hole, which weakens the blasting effect.

In addition, the blasting tube is first put into the inner water bag and then put into the inner water bag, which is only suitable for the situation where the drilling is relatively submerged, and it is difficult to put it into a deep hole

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