Top-cutting roadway coal-pillar-free mining method of close-range thin coal seam

Abstract

The invention discloses a top-cutting roadway coal-pillar-free mining method of a close-range thin coal seam. The method comprises the following steps of: (1), excavating an upper crossheading roadway and a lower crossheading roadway; (2), mounting a grouting constant-resistance anchor rope and a grouting constant-resistance anchor rod without grouting at first, and a monomer hydraulic pillar, machining energy-accumulation presplitting top-cutting holes, and blasting to obtain presplitting cutting joints; (3), extracting an upper coal seam till unavailable; (4), allowing a mining field ejection plate to collapse along the shallow energy-accumulation presplitting cutting joints; (5), spraying a concrete spray layer to the rise side wall of the lower crossheading roadway, and grouting the grouting constant-resistance anchor rope and the grouting constant-resistance anchor rod; (6), extracting a lower coal seam till unavailable, and allowing the mining field ejection plate to collapse along the deep energy-accumulation presplitting cutting joints; (7), taking a roadway automatically formed at the original lower crossheading roadway as the upper crossheading roadway of a next mining surface; and (8), repeating steps (2) to (7). According to the method, by using the cutting joints formed by the energy-accumulation presplitting top-cutting holes for blasting the ejection plate, shallow breakage and deep breakage can be performed twice, and twice collapse of the mining field ejection plate is achieved.

Description

technical field [0001] The invention relates to a mining method of a coal seam, especially for a coal seam with an inclination angle of 0° to 10°, a coal seam mining thickness of 0.5m to 1.3m, and a distance between two adjacent coal seams of 1.0m to 5.0m. And it is related to the coal seam mining method of the longwall working face of the short-distance thin coal seam group under the condition of hard roof. Background technique [0002] At present, there are some short-distance thin coal seams, the coal seam dip angle is between 0° and 10°, the coal seam mining thickness is between 0.5m and 1.3m, the distance between two adjacent coal seams is between 1.0m and 5.0m, and the coal seam The top plate is a hard top plate. In order to increase the speed of advancement and high-efficiency production, the fully mechanized mining of these short-distance thin coal seams has been widely promoted and applied in my country, and has achieved good economic and technical benefits. Since...

AI Technical Summary

Problems solved by technology

[0003] The invention proposes a new method aiming at the technical problem that the maintenance of the gob-side roadway cannot realize coal pillar mining in the current mining of thin coal seams and short-distance coal seams.

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