A Direct Injection Directional Gas Explosion Method Based on Concentrated Energy Pretreatment

Abstract

The invention relates to a direct injection type directional gas blasting method based on energy gathering pretreatment. The method comprises the following steps that (1), the drilling operation is carried out on an excavation contour line according to a blasting design scheme; (2), a prepared shaped charge is loaded into a blast hole according to a preset fracturing direction; (3), a section of reserved distance is reserved at the hole opening and is not loaded with the charge, and then fuse connecting and detonating are carried out for pre-blasting of the blast hole; (4), the blast hole is cleaned, a heating hole sealing device is installed in the blast hole, and then the liquid gas is injected into the blast hole through the heating hole sealing device; (5), the heating hole sealing device is connected with a parallel element, and the heating hole sealing device is connected in parallel through the parallel connection element; and (6), a power source is powered on for detonating. According to the method, the expansion direction of a crack in the gas blasting process of rock can be effectively controlled, so that it is guaranteed that the rock forms the penetration crack with relatively high flatness in the preset fracturing direction in the gas blasting process; and the operation is simple, the working efficiency is high, and the economic cost is saved.

Description

technical field [0001] The invention relates to a gas blasting method, in particular to a direct injection directional gas blasting method based on energy-gathering pretreatment. Background technique [0002] Gas blasting technology is to use liquid gas (carbon dioxide gas is relatively safe and easy to buy in the market at a low price; carbon dioxide is mostly selected as the blasting auxiliary material) to vaporize and expand when heated, and quickly release high-pressure gas to break and loosen rocks. It has high safety and low destructiveness. It has the characteristics of less pollution and less pollution, and provides favorable assistance for safe mining and loosening of mines. Therefore, it is widely used in various mines (pebble mines, iron mines, coal mines, gold mines, etc.), tunnels, tunnels, trench rises, road construction, permafrost loosening and other projects. [0003] At present, the equipment used in gas blasting technology is a gas blasting tube, includin...

AI Technical Summary

Problems solved by technology

Due to the same strength and stress in all directions, this expansion medium storage structure has uncertainty in the direction of fracture caused by the rock mass, and it is difficult to control the crack expansion direction during the rock blasting process, and the expansion medium storage structure occurs after blasting. Severe deformation and damage make it difficult to repair and reuse, which increases the cost of blasting

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