A method for mining deep coal seams

Abstract

The invention discloses a method for mining a deep coal seam. The method comprises the steps: determining a protective coal pillar in a coal seam to be mined, wherein the protective coal pillar is taken as a protected area; respectively mining the left side and the right side of the protected area, forming a first mined-out area on the left side of the protected area, and forming a second mined-out area on the right side of the protected area, wherein the length of the first mined-out area and the second mined-out area inclined along a working surface is not less than 0.6 time the thickness of an overlying rock of the coal seam to be mined, and a roadway arrangement mode without the coal pillar is adopted between working surfaces forming the first mined-out area and between working surfaces forming the second mined-out area; mining the protected area, wherein the first mined-out area and the second mined-out area are communicated with each other as the protected area is mined. By adopting the method disclosed by the invention, after mining the protected area, the uniform subsidence of earth surface is realized, a nearly horizontal state appears finally, and buildings on the earth surface can be effectively protected.

Description

technical field [0001] The invention belongs to the field of coal mining, and in particular relates to a deep coal seam mining method that can avoid damage to surface structures. Background technique [0002] Domestic coal mining has gradually developed towards deep mining (for example, the depth of mining coal seams is greater than 400m). With the increase of mining depth, the mine mining environment has changed significantly compared with shallow mining. The traditional rock formation control theory and technology cannot adapt Deep mining. In terms of surface subsidence, the characteristics of surface subsidence in deep mining are significantly different from those in shallow mining. [0003] According to the existing relevant literature through theoretical and experimental analysis, with the increase of coal mine mining depth, when the mining width is the same, the movement and deformation values ​​of the surface in deep mining are smaller than those in shallow mining, w...

AI Technical Summary

Problems solved by technology

There are many difficulties in coal mining, which are mainly reflected in two aspects: one is that the amount of coal pressed under the building is large and the area is large; the other is that with the further development of the mining area, the ground collapse and damage within the mining area are serious, and the buildings have nowhere to move.

Although the existing strip mining achieves the purpose of protecting the buildings at the bottom, the recovery rate is low, resulting in a large waste of resources; It is conducive to the protection of surface houses, and deep mining is an opportunity for coal mining under the village

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