High-dipping extremely-close-distance coal seam top coal caving mining method

Abstract

The invention provides a high-dipping extremely-close-distance coal seam top coal caving mining method. According to the method, a transportation gateway is constructed along one side of a coal layer bottom plate and an air returning gateway is constructed on the other coal layer; the elevation of a bottom plate of the air returning gateway is 4-4.5m higher than that of a bottom plate of the transportation gateway; rectangular roadways are constructed between the two gateways at an interval of 10m and are used as connection roadways; hydraulic brackets are distributed on two coal layers along the thickness directions of the coal layers; each circulating unit advance of a worktable bracket is the same as the distance of the connection roadways; in a top coal caving process, top coal discharged by the coal layers of the transportation gateway and manually-mined falling coal in a manner of manually shoveling coal and filling into a scraper plate conveyor to be transported out; the top coal discharged by the coal layers of the air returning gateway is filled into enamel chutes of the connection roadways in a manner of manually shoveling the coal to flow into a bracket tail beam of the coal layers of the transportation gateway, and is put into the scraper plate conveyor to be transported out by manually shoveling the coal. The high-dipping extremely-close-distance coal seam top coal caving mining method has the advantages of being simple in arrangement of a working surface, strong in adaptability, good in ventilation, relatively good in safety degree, large in supporting space and high in production efficiency.

Description

technical field [0001] The invention belongs to the field of mining engineering, and in particular relates to a coal mining method for top-coal caving in a steeply inclined extremely close-distance coal seam. Background technique [0002] The mining method of steeply inclined coal seams has always been a difficult problem in mining technology, which has attracted the attention of relevant state departments. For a long time, people have made unremitting efforts on this, and made gratifying progress. However, due to the particularity of mining conditions in steeply inclined coal seams, mining methods are still the main obstacle to improving the technical and economic aspects of such mines. Steeply inclined coal seam reserves account for 40% of my country's total coal reserves, while 80% of mining areas in southern China have steeply inclined coal seams. In my country, especially in southern mining areas, most of the steeply inclined coal seams are less than 10m thick, mostly...

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Problems solved by technology

There are various methods of mining these coal seams, but most are immature and have many problems

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