Coal-rock simultaneous production protecting seam and protected seam collaborative mining method

Abstract

The invention relates to a coal-rock simultaneous production protecting seam and protected seam collaborative mining method applicable to multi-seam combined mining under poor mining conditions of protecting seams. According to the time-space relationship characteristics that one coal-rock protecting seam and one previous protected seam are mined simultaneously during multi-seam combined mining, when the coal-rock protecting seam is mined, the mined coal and rock are separated, washed and crushed according to size and conveyed to a mined out area of the previous protected seam for filling the mined-out area, gangue mined out excessively is prevented from being discharged out of a mine, the gangue does not need to be lifted from the mine, and the lift cost is reduced; the mined rock can be used as underground mine-fill after being treated, the problem about sources of the mine fill is solved, and ground surface settlement is prevented effectively. By the method, pressure-relief mining of the coal-rock protecting seams is realized, meanwhile, green fill mining of the previous protected seams is realized, high-efficient treatment of coal-mine gas is ensured, the coal-rock protecting seam mining is safer, more efficient and greener, and significant economic and social benefits are obtained.

Description

technical field

[0001] The invention relates to a coal and rock simultaneous mining protection layer and a protected layer cooperative mining method, which is especially suitable for multi-coal seam joint mining where the protection layer mining conditions are relatively poor. Background technique

[0002] For coal seam groups, the most effective method of pressure relief and gas drainage is the preferred mining protection layer, which is also the preferred method of pressure relief and drainage of coal seams in the "Regulations on the Prevention and Control of Coal and Gas Outburst". However, for many coal seam groups, due to the large distance between coal seams or the uneven distribution of coal seam thickness and serious polarization, they do not have good protection layer mining conditions. Some scholars have proposed to use the method of coal and rock simultaneous mining to implement protective layer mining, but a large amount of gangue will be generated when the coal ...

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