Protective coal seam and unmanned thin coal seam mining method

Abstract

A protective coal seam and unmanned thin coal seam mining method comprises technological steps as follows: 1, a full coal thick strip with the width of 2-3 m is mined on a protective coal seam or an unmanned coal seam, and then enclosed space is formed by the full coal thick strip; 2, the mined full coal thick strip is filled with a degradable material to form a support body; 3, a next full coal thick strip with the width of 2-3 m is mined by skipping a temporary coal pillar with the width of 2-3 m, and the mined full coal thick strip is filled with the degradable material; 4, the step 2 is repeated for multiple times, and all temporary coal pillars are mined one by one after the mining is proceeded to certain area; 5, degradation conditions of the degradable material are created, that is, closed conditions are removed, a roof support is started to release, and overlying rock is subsided in the support compression process. According to the method, the support is automatically decomposed step by step after recovery, so that the overlying rock in a recovery zone is slowly and uniformly subsided and unloaded, rock burst and sudden massive surge of gas are effectively prevented, and the impact pressure of a roof is relieved, the roof caving is prevented.

Description

technical field [0001] The invention relates to a coal mining method, in particular to a protective layer and an unmanned thin coal seam mining method. Background technique [0002] At present, both at home and abroad, the direct caving method is used to mine the protective layer. Generally, the thin coal seam near the protected layer is selected, so that the overlying strata in the mining area can be concentrated and unloaded. Thin coal seams below 1 meter have limited space, inconvenient movement, and poor working environment; there is a contradiction between equipment volume and available space, and the influence of geological structure is more prominent in thicker coal seams, making it difficult to fully mechanized mining, which increases the difficulty of mining in protective layers. After mining, unminable coal pillars are left, which is not only a waste of resources, but also prone to disasters such as roof fall and gas outburst. Therefore, it is a technical problem ...

AI Technical Summary

Problems solved by technology

Thin coal seams below 1 meter have limited space, inconvenient movement, and poor working environment; there is a contradiction between equipment volume and available space, and the influence of geological structure is more prominent in thicker coal seams, making it difficult to fully mechanized mining, which increases the difficulty of mining in protective layers

After mining, unminable coal pillars are left, which not only wastes resources, but also is prone to disasters such as roof fall and gas outburst

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