Coal-mining method of loose coal seam

Abstract

The invention provides a coal-mining method of a loose coal seam. The method comprises the following steps: firstly, setting one water injection point every two wetted radiuses r at a part, which is ahead of 120m of a coal mining working surface along the coal seam in a rail drift and a conveying drift; statically injecting water into a coal body at each water injection point, wherein the water injection point is propelled and moves forwards in sequence along the coal mining working surface; meanwhile, injecting high-pressure water into the coal body of the working surface on a wall along a coal seam inclining direction until water automatically leaks out; then starting to cut the coal; in a coal cutting process, spreading a metal net above a hydraulic bracket, wherein a whole top plate is separated by the metal net so as to carry out whole stoping work under the metal net and guarantee that the crushed top plate does not flow into a stoping space; after cutting the coal, rapidly pushing a front canopy of the hydraulic bracket, wherein the travel L of the front canopy is greater than the cutting depth of a coal-mining machine; and pushing a scraping plate conveyor and the hydraulic bracket so as to shorten the exposure time of the top plate as much as possible. The coal-mining method of the loose coal seam, provided by the invention, is safe and efficient, and the coal body can be prevented from wall caving.

Description

technical field [0001] The invention relates to the technical field of underground mining in coal mines, in particular to a coal mining method suitable for fully mechanized mining working faces with low coal moisture content in deep mines and a coal solid coefficient below 0.7. Background technique [0002] Coal is the main energy source in our country. With the increase of mining intensity, shallow coal resources have been exhausted. However, the coal reserves buried more than 1000m are as high as 2.64 trillion tons, which is about 47.4% of the unmined coal reserves. Loose coal bodies with a moisture content of less than 4% and a firmness coefficient of less than 0.7 are often encountered in deep mine mining, such as the Lianghuai mining area, Datong mining area, Yanzhou mining area, and Fuxin mining area in my country. Under such harsh coal seam occurrence conditions, what kind of mining method should be used for safe and efficient mining has always puzzled the field engin...

AI Technical Summary

Problems solved by technology

If the coal body has not undergone corresponding treatment and the hydraulic support has not been specially designed, large-scale fragmentation accidents of the loose coal body often occur du

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