High-dipping extremely-close-distance coal seam top coal caving mining method
An extremely short-distance, top-coal caving technology, which is applied in ground mining, earthwork drilling, underground mining, etc., can solve immature problems and achieve the effects of increasing production, improving coal recovery rate, and safe and efficient production
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[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0020] see figure 1 , figure 1 Middle A coal seam 1 and B coal seam 2 are two medium-thick coal seams with steep slope and close distance, and rock layer 3 is between the two coal seams. See attached figure 2 , in the implementation process of the method, the transportation channel 4 is constructed along the bottom plate side of the A coal seam 1, and a rectangular roadway is used; the air return channel 5 is constructed in the B coal seam 2, and a quadrilateral roadway is used. Among them, the elevation of the bottom plate of return air chute 5 in coal seam 1 is 4-4.5m higher than the floor el...
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