| 摘要 |
A complete non-coal-pillar continuous depressurized mining method for a short-distance coal seam group, which is applicable to a coal mining project. The method comprises: determining the mining sequence of coal seams in a coal seam group; when a first coalface (1) of a first mined coal seam is mined, building a filling-wall (11) in which a breather pipe (10) is disposed along the edge of a goaf, so as to form a gob-side entry retaining (12); taking the roadway as a transportation roadway (4) when a second coalface (2) is mined, continuing to perform a gob-side entry retaining (12) in a track roadway, cutting and removing a flexible mold bag (13) on the surface of the previous gob-side entry retaining (12) behind the coalface; and when the coal recovery of the second coalface is completed, filling carbon dioxide into the breather pipe (10) in the filling-wall (11) of the first coalface, so that a carbonization reaction occurs on the filling-wall (11), and the filling-wall (11) is broken and decomposed. After the mining of a coal seam is completed, because a top plate is not supported by a coal-rock pillar, the top plate can move and sink fully and the depressurized mining on adjacent coal seams can be achieved, thereby avoiding the stress concentration produced by the hangover of the filling-wall, and facilitating the mining space maintenance, gas extraction and dynamic disaster prevention and control. |
