Single coal seam gas drainage method

Abstract

The present application relates to the technical field of coal mining, in particular to a single coal seam gas extraction method. The gas drainage method includes the following steps: the track trough of the first working face is preserved as the transport trough of the second working face by the gob-side entry retaining process, and the bedding is constructed in the track trough of the first working face Long drilling, pre-pumping the gas in the recovery area of ​​the second working face and the strip gas in the track trough area of ​​the second working face, after the strip gas control in the track trough area of ​​the second working face reaches the standard, the second The track of the working surface follows the groove to form the second working surface. Except that the gas drainage roadway needs to be constructed in the first mining face, the rest of the working face is through the gob-side retaining roadway of the previous working face to construct long holes along the bedding to eliminate outbursts, cancel the gas drainage roadway in the other working faces, and reduce the The roadway excavation project has been solved, and the problem of tight mining replacement has been solved.

Description

technical field [0001] The present application relates to the technical field of coal mining, in particular to a single coal seam gas extraction method. Background technique [0002] As the mining intensity and depth of coal resources continue to increase, the threat of coal and gas outbursts to coal mine safety will become increasingly serious. In a single coal seam mine with a risk of coal and gas outburst, it is necessary to arrange a gas drainage roadway in the slate layer on the top (or bottom) of the coal seam, and to pre-drain the coal seam gas in strips of the coal seam through the construction of intensive through-bed drilling and drilling along the length of the coal seam. It is one of the main regional outburst prevention measures. One mining face needs to excavate two coal roadways and two gas drainage roadways. The gas drainage roadway is constructed in the slate layer on the top (or bottom) of the coal seam. The amount of drilling work is large and the constru...

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Problems solved by technology

[0004] (1) The gas drainage roadway is arranged in the rock, the excavation speed is slow, the drilling construction is difficult, the excavation time is long, and the roadway excavation progress is far lower than the recovery progress, resulting in the imbalance of mine excavation;

[0005] (2) After the construction of gas drainage roadway and drilling is completed, it is necessary to carry out gas drainage on the mining face and tunneling roadway, and the construction can only be carried out after the gas pressure and content meet the relevant safety requirements. "Cannot be coordinated and carried out at the same time, seriously affecting production efficiency

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