Underground mining, selecting and filling synergic mining method for close distance coal seam group

Abstract

The invention relates to an underground mining, selecting and filling synergic mining method for a close distance coal seam group and belongs to the field of mineral engineering. The method comprisesthe following steps: carrying out full-mechanized caving mining on the close distance coal seam group and designing an underground gangue sorting system and a filling working face according to a gangue output quantity in the production process; conveying the gangues produced in the mining process to an underground gangue sorting chamber, and conveying the sorted chambers to the filling working face for filling mining; and after underground washing of the gangues generated by the filling working face, conveying the gangues to the filling working face for backfilling. The method achieves zero emission of the gangues under an integrated mining condition of the gangues of the close distance coal seam group, eliminates adverse influence of ground gangues to the environment, increases the fine coal promoting rate, and liberates the primary lifting pressure. Meanwhile, the gangues are sorted nearby and fill in selected positions, so that damage and disturbance to underground rock bodies by aconventional mining method are alleviated greatly, and the strong dynamic pressure governing problem is pre-solved.

Description

technical field [0001] The invention relates to an underground mining, selection, filling and collaborative mining method for short-distance coal seam groups, which belongs to the field of mining engineering. Background technique [0002] my country's "Coal Mine Safety Regulations" defines close-distance coal seams as coal seams with small distances between coal seam groups and a large influence on each other during mining. At present, there are three mining methods for close-distance coal seam groups at home and abroad: layer-by-layer up-down mining, combined mining, and integrated coal-gang mining. When the distance between coal seams is large, using reasonable layer-by-layer upward and downward mining and joint mining can realize pressure relief mining, reduce the mutual influence of upper and lower coal seam mining, create favorable conditions for the next step of mining, and improve production efficiency. When the distance between coal seams is small, especially when t...

AI Technical Summary

Problems solved by technology

At present, there is a lack of a mining method that not only realizes efficient mining of coal seam groups at close distances but also avoids ground discharge of gangue

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