High-pressure hydraulic tunneling, pressure releasing and protrusion removing method for upper drainage roadway

Abstract

The invention discloses a high-pressure hydraulic drilling, pressure releasing and protrusion removing method for an upper drainage roadway. The method comprises the following steps of: arranging a drilling field (2) in the upper drainage roadway (12) and constructing boreholes with small apertures in a protrusion-preventing area coal bed (1); driving a hydraulic jet device (5) to eject high pressure water so as to form rotational impact by using a drill stem (4), and performing continuous rotational impact drilling on the boreholes (3) until a drilling level meets a designed requirement; meanwhile, collecting a coal-water mixture produced in the hydraulic drilling process and feeding into a coal and water treatment system (11) by using a slurry returning pipeline (11); and when the hydraulic drilling work of all the boreholes is finished, increasing the transmittance of a coal body under uniform pressure under the action of ground pressure and gas pressure, and draining gas from a pressure releasing coal bed (1) by the conventional method. By the method, the number of the boreholes (3) is greatly reduced, the pressure releasing space (6) of the coal bed (1) is expanded, and the gas drainage efficiency is improved; and by injecting the high pressure water, dust is effectively restrained, the protrusion danger of the coal bed is lowered, and underground operation environment is improved.

Description

technical field [0001] The invention relates to a method for pressure relief and outburst elimination of a coal seam in an upward pumping lane with high-pressure hydraulic digging, and is especially suitable for a gas outburst prevention method for eliminating the risk of outburst in a relatively soft coal seam with high gas and low air permeability. Background technique [0002] The mining of high-gassy and low-permeability coal seams is often accompanied by a large amount of gas gushing out. With the increase of coal mining depth, the outburst risk of mine coal seams is further enhanced, and some shallow non-outstanding coal seams gradually turn into outburst coal seams after entering the deep part , coupled with the complex geological conditions of mining coal seams, it is easy to cause extraordinarily large gas accidents. Therefore, how to effectively solve the problem of gas outburst in the process of mining high-gas and low-permeability coal seams is of great significa...

AI Technical Summary

Problems solved by technology

However, when drilling large-diameter holes on site, it is difficult to discharge slag, the length of the hole is short, the damage rate of the drilling tool is high, the amount of work is large, and the hole collapses after the hole is formed, it is difficult to achieve the desired anti-outburst effect.

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