Centralized gas control method for coal measures in closed distance seam group

Abstract

The invention discloses a centralized gas control method for coal measures in a closed distance seam group. The method comprises the following steps of ensuring that the pressure relief protection range covers other minable seams after a first mining layer is mined according to gas parameters and outburst danger degree of each coal seam of middle coal measures and a development range of a gas emission channel formed by movement, deformation and rupture of roof and floor rock strata of each coal seam under the influence of mining of the first mining layer; arranging a first mining face in the first mining layer, determining a mining roadway of the first mining face, and arranging a gas centralized control roadway according to the thickness of each coal seam, the interlayer spacing, the drilling construction difficulty and the control range; constructing crossing long drilling holes in the gas centralized control roadway so as to pre-extract strip gas of two roadways on the first miningface of a protective layer, and continuously drilling after the drilling holes penetrate through the first mining layer until all coal seams on the upper part of the middle coal measures are explored;and continuously constructing the crossing drilling holes so as to pre-extract gas of each coal seam in the mining area of the first mining face and a pressure relief area of the middle coal measuresin the tunneling period of the mining roadway of the first mining face, so that the gas control work amount in the mining period is reduced.

Description

technical field [0001] The invention relates to a method for controlling gas, in particular to a method for controlling concentrated gas in coal formations in short-distance coal seam groups, and belongs to the technical field of gas control in coal mines. Background technique [0002] In recent years, with the increase of coal mine mining depth, coal seam gas pressure and gas content have gradually increased, mine gas control has become more difficult, gas disasters have become more prominent, and gas accidents may occur at any time, which seriously threatens the safe production of coal mines in my country, especially in Guizhou Province. The most serious problem is that most of the mines in this area are coal and gas outburst mines, which belong to the mining of short-distance coal seam groups, and the occurrence conditions of coal seams are complex. [0003] The number of coal seams in the same coal-bearing formation can reach dozens of layers in the short-distance coal se...

AI Technical Summary

Problems solved by technology

The coal quality of the middle coal formation is well developed, the gas content of the coal seam is high, and it has a high risk of outburst. Due to coal quality, coal thickness and other reasons, there is no mining condition for the time being

Images