Rapid outburst elimination method for cross cut coal uncovering in coal mine underground

Abstract

The invention provides a rapid outburst elimination method for cross cut coal uncovering in coal mine underground. The method comprises the following steps: before an outburst coal layer is uncovered by a cross cut, arranging hydraulic fracturing drill holes at the part, the normal distance of which is 5-7m with a coal layer, on a cross cut coal uncovering work face; sealing the fracturing drill holes; fracturing the fracturing drill holes with clear water the injection amount of which is determined according to an outburst elimination range; after fracture is finished, constructing deslagging blowholes, injecting high-pressure water into the fracturing drill holes for punching, and discharging coal and rocks generated from fracturing to the outside through the deslagging blowholes; carrying out gas extraction and drilling on the cross cut coal uncovering work face, sealing the drill holes by use of polyurethane and carrying out gas extraction, wherein the holes are sealed to the top plate / bottom plate of the coal layer; injecting high-pressure nitrogen or air into the fracturing holes, observing the gas flow and concentration change in gas extraction holes, and stopping gas injection if flow increases; if the gas extraction effect reaches the standard, and uncovering the rock cross cut when no outburst danger occurs to the cross cut work face; and if the gas extraction effectis not good, implementing fracturing once again and injecting high-pressure gas to expel and exchange methane. The method has the advantages of accelerating the coal uncovering speed of the cross cutwork face, playing a role in dust suppression, and improving the work conditions of a tunneling work face.

Description

technical field [0001] The invention relates to a rapid outburst elimination method for uncovering coal at an underground stone gate in a coal mine. Background technique [0002] Article 81 of the "Regulations on the Prevention and Control of Coal and Gas Outbursts" issued by the National Safety Production Supervision and Administration Department and the State Coal Mine Safety Supervision Bureau in August 2009 stipulates that "the outburst prevention measures for the coal mining face in Shimen include pre-extraction of gas, discharge of drilling holes , hydraulic punching, metal skeleton, coal solidification or other measures that have been proven effective by tests", "according to the rock formation conditions of the working face, the minimum normal distance between the coal mining face and the outburst coal seam is required when implementing the anti-outburst measures of the working face It is: 5m for pre-extraction of gas, discharge drilling and hydraulic punching, and 2...

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Problems solved by technology

[0003] Although the "Regulations on the Prevention and Control of Coal and Gas Outburst" listed many methods and technologies for the outburst prevention measures of coal uncovering in Shimen, during the implementation process, due to the differences in the occurrence conditions of coal seams, one or several of these measures were not implemented. In the process, it is difficult to quickly eliminate the outburst, which affects the speed of coal removal in Shimen, which in turn affects the mining succession and safe production of the mine.

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