Layout method for lower slice of close distance coal seam group and low layer structure

Abstract

The invention relates to a distribution method for a lower slice of a close distance coal seam group and a low slice structure. The layout method for the lower slice of the close distance coal seam group comprises the step that two roadways of one working surface are tunneled and limited at the positions, corresponding to the positions under every two adjacent mined-out areas in an upper slice of the close distance coal seam group, of the lower slice respectively. The roadways of one working surface are limited in the lower slice structure of the close distance coal seam group and located at the positions under every two adjacent mined-out areas in the upper slice of the close distance coal seam group respectively. According to the layout method and the lower slice structure, an upper-slice coal pillar arranged between every two adjacent mined-out areas is made to be located over the corresponding working surface, and a lower-slice coal limited by every two roadways in two adjacent working surfaces and the two roadways are located under the same mined-out area. Accordingly, the roadways in the lower slice are flexible in distribution, small in supporting difficulty, easy to maintain and high in mining rate.

Description

technical field [0001] The invention relates to the field of coal, in particular to a method for arranging a lower layer of a short-distance coal seam group and a lower layer structure. Background technique [0002] my country's short-distance coal seam groups are widely distributed, such as Xishan mining area, Fenxi mining area, Shendong mining area, Datong mining area, etc. Coal seam coal resources have large reserves, wide distribution range, and high mining intensity, which is a common problem in coal mining in my country. Different from single coal seam mining, the space and complexity of close-distance coal seam group mining are very prominent. The surrounding rock stress environment of the roadway is harsh, and the dynamic pressure influence is very significant. The safe mining technology of close-distance coal seam group is very complicated. [0003] Among them, in the environment of close-distance coal seam group, the stability of mining roadway is a complex spatial...

AI Technical Summary

Problems solved by technology

[0008] It can be seen that there are different advantages and disadvantages in the roadway layout of the lower layers of the above three types of close-distance coal seam groups. At present, most of the mining of short-distance coal seam groups adopts internal staggered layout, so as to reduce the support of the roadway in the lower layer. However, there are generally a series of problems such as excessive coal pillar size, low recovery rate, and difficult roadway layout.

Images