Method for arranging and supporting roadways of upper and lower coal seams at extremely close distances

Abstract

The invention relates to a method for arranging and supporting roadways of upper and lower coal seams at extremely close distances, in particular to a method for arranging and supporting roadways of lower coal seams when extremely close coal seams have obvious mutual influence. According to the method for arranging and supporting the roadways of the upper and lower coal seams at the extremely close distances, an inner-staggered arrangement mode and an outer-staggered arrangement mode are combined, two crossheads of working faces of the lower coal seams are correspondingly arranged below coal pillars of upper-layer coal and below a goaf, the crossheads below the coal pillars are supported by full-length prestressed grouting anchor rods and grouting anchor cables, and a crossheading below the goaf is supported by a shed. Compared with an inner staggered mode and an outer staggered mode, the roadway arrangement mode reduces coal pillar loss, anchor net cable supporting replaces shed supporting, the labor intensity of workers is reduced, the tunneling speed is increased, the replacement pressure of a working face is relieved, and the stability of roadway surrounding rock is maintained.

Description

technical field [0001] The invention relates to an arrangement method and a support method of an upper and lower coal mining roadway, in particular to an arrangement method and a support method of a lower coal seam roadway when coal seams are extremely close to each other and there is significant mutual influence between the coal seams. Background technique [0002] With the high-intensity development and utilization of coal resources, the coal resources with good occurrence conditions are about to be exhausted. In order to ensure the sustainability of coal resources, it is necessary to start to consider the mining of extremely close coal seams. Although the extremely close distance coal seam is widely distributed in our country, it is difficult to mine. This is mainly due to the fact that the distance between coal seams in extremely close coal seams is very close, and the mining of upper coal seams often leads to special roof conditions such as broken roofs, poor stability,...

AI Technical Summary

Problems solved by technology

[0005] Whether it is the staggered outside or the staggered inside, there is a phenomenon that the coal pillar is too large, the coal pillar is too wide in the upper coal seam section of the staggered outside, and the coal pillar is too wide in the lower coal seam section of the staggered inside. No matter which method is used, it will cause a waste of coal pillar resources caused by an overly wide coal pillar in a certain layer, and reduce the coal recovery rate. Therefore, there is an urgent need for a roadway layout and support method that can not only increase the coal recovery rate, but also reduce the coal recovery rate. Improving the speed of excavation can reduce the labor intensity of workers and relieve the tension of coal mine production replacement

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