Coal seam region slicing, pressure relief and permeability increasing method based on 'mining protective layer' principle

Abstract

The invention belongs to the technical field of coal mine safety, and relates to a coal seam region slicing, pressure relief and permeability increasing method based on a 'mining protective layer' principle. A slicer machine head reciprocates along a vertical gateway to cut a coal body; cut-off coal debris is conveyed out through a scraper conveyer; and a cutting boundary of a slicer moves along with a heading end at a certain speed in the direction towards an open-off cut of a stope face, sufficient pressure relief is realized on a coal body of a rear region due to a free space 200-300 mm wide cut by the slicer, an original gas pressure of a coal seam is reduced to close to zero (gauge pressure), and a gas permeability coefficient is increased by two or more orders of magnitude. By meansof the coal seam region slicing, pressure relief and permeability increasing method, sufficient pressure relief is realized on a protruding coal seam, the technical and economic problem that there isno protective layers for the protruding coal seam for mining is solved, and for those protruding mines where only construction of coal seam drilling and coal seam gas pre-drainage serves as a regionalanti-protruding measure, the brand-new solution of a regional anti-protruding technology is provided.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety, and relates to a pressure-relief and anti-reflection method for coal seam area slices based on the principle of "mining protective layers". Background technique [0002] Coal and gas outburst is a special type of gas gushing phenomenon, that is, under the action of pressure, a large amount of broken coal and gas are suddenly ejected from the coal body to the mining space. Coal and gas outburst is a powerful natural disaster in coal mine production. It seriously threatens the safety of coal mine production and is extremely destructive. [0003] The deep coal seams of my country's coal mines show significant characteristics of "high geostress, high gas pressure, and low permeability". At present, for the prevention and control of coal and gas outburst and coal-rock gas dynamic disasters, the mining protection layer and pre-pumping of coal seam gas are mainly used. Gas dynamic disaster. ...

AI Technical Summary

Problems solved by technology

At present, for the prevention and control of coal and gas outburst and coal-rock gas dynamic disasters, the mining protection layer and pre-pumping of coal seam gas are mainly used. gas dynamic disaster

Moreover, in actual coal mining, there are not many outburst mines that meet the conditions for mining protective layers. Since the founding of New China, there have been very few outburst mines that have the conditions for mining protective layers and have achieved good results. However, there are hundreds of outburst mines in my country. That is to say, most outburst mines cannot use protection layer mining measures to eliminate outbursts, and can only use the relatively ineffective method of pre-extracting coal seam gas

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