Method for fracturing and permeability improvement to shield coal road excavation by utilizing pulse detonation waves

Abstract

The invention discloses a method for fracturing and permeability improvement to shield coal road excavation by utilizing pulse detonation waves, and is suitable for quick excavation of a coal bed and a coal road with high gas and low permeability. The method comprises the following steps: firstly constructing a detonation extraction drill hole from a bed plate tunnel to the coal bed by utilizing a drilling machine, then sending a high-voltage electric pulse generator into the detonation extraction drill hole, controlling the high-voltage electric pulse generator to release the high-energy pulse detonation waves to the detonation extraction drill hole repeatedly through an anti-explosion control table, after a large number of fractures are formed in the coal body around the detonation extraction drill hole, connecting the detonation extraction drill hole into a gas extraction pipeline, and after the gas extraction reaches the standard, conducting the coal road excavation. According to the method, the coal body is subjected to high-energy fracturing by utilizing the pulse detonation waves, a fracture network is formed in the coal bed to provide passages for gas flow, the efficiency of penetrating a layer to drill a hole for coal bed gas pre-drainage is improved, the gas pre-drainage time is shortened, and quick coal road excavation is realized.

Description

technical field [0001] The invention relates to a method for using pulse detonation waves to create cracks and increase penetration to protect coal roadway excavation, and is especially suitable for underground coal mine high-gassy and low-permeability coal seam bottom pumping roads to penetrate layers and drill holes to protect coal roadway excavation. Background technique [0002] Most coal seams in my country generally have the characteristics of high gas and low gas permeability, and the gas extraction is difficult and efficient. Therefore, artificially increasing the permeability of the coal seam, increasing the permeability of the coal seam, and then improving the concentration and efficiency of gas extraction in the coal seam are the main measures to solve the problem of gas gushing and gas exceeding the limit in the process of coal roadway excavation. At present, commonly used coal seam fracturing and permeability enhancement measures include hydraulic cutting, hydra...

AI Technical Summary

Problems solved by technology

At present, commonly used coal seam fracturing and permeability enhancement measures include hydraulic cutting, hydraulic fracturing, deep hole loosening blasting, etc. Although some achievements have been achieved, there are still some limitations. It is difficult to control the direction, and it is difficult to send explosives in deep hole loosening blasting, etc.

These shortcomings limit the field application of the existing coal seam fracturing and permeability enhancement measures, and affect the driving efficiency of the coal seam coal roadway

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