Sharply inclined coal seam mining method

Abstract

The invention discloses a method for mining a steeply inclined coal seam. The method comprises the following: step one, opening a return airway (2) and a first conveyor roadway (3) in the steeply inclined coal seam (1); step two, digging a first through cut (12), and placing a flexible shield support (5) on the first through cut (12) for roof control, thereby forming a false dip primary mining working surface (8); step three, starting coal mining on the primary mining working surface (8); step four, gradually extending the primary mining working surface (8) downwards to produce a second through cut (11) for the coal seam of the next section opposite to the inclined direction of the primary mining working surface (8), when the primary mining working surface (8) is propelled to the position of the second through cut (11) which is designed for the coal seam of the next section, and mining the coal seam of the next section; step five, mining the lower coal seam with the step four, and continuously and recurrently mining the whole steeply inclined coal seam (1) from the bottom to the top. The method has the advantages of high mining efficiency, safer mining and high percentage of recovery.

Description

technical field [0001] The invention belongs to a coal mining method, and in particular relates to a mining method for controlling the top of a steeply inclined coal seam with a flexible cover support. Background technique [0002] At present, the mining methods of steeply inclined coal seams are as follows: Figure 5 As shown, the return airway 2 is opened in the steeply inclined coal seam, and the conveyor lane 3 is opened in the steeply inclined coal seam below the return airway 2. First excavate an oblique cutout in the steeply inclined coal seam 1 above the conveyor lane 3, the upper end of the cutout communicates with the air return lane 2, and the lower end of the cutout communicates with the conveyer lane 3 for transportation through the connecting inclined lane 7 ,, and then place a flexible cover support 5 to control the roof in the cut hole to form a pseudo-inclined initial mining face 8; a coal pillar 4 is left between the mining coal seam 1 and the conveyor lane...

AI Technical Summary

Problems solved by technology

[0003] 1. Excavating conveyor lanes and return air lanes in the coal seam, because the coal seam is relatively soft, it is easy to collapse, the roadway support and maintenance are difficult, and the workload is heavy

[0004] 2. Excavating conveyor lanes and return air lanes in the coal seam is prone to coal and gas outbursts. The workload and cost of outburst prevention are large, and the single advance level of excavation is seriously restricted, which easily leads to tension in excavation replacement.

[0005] 3. Between the upper and lower coal seams, a slanted coal pillar with a length of about 5m should be left. The loss of coal resources in a single coal seam is about 13,000 tons, and the recovery rate is low

[0006] 4. After mining the previous section of coal seam, it is necessary to turn around to the other end to mine the next section of coal seam. There are many times of moving, racking, and dismantling, and the number of transfers is high, and the labor intensity is high.

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