Three-dimensional source separated pressure-releasing gas treatment method

Abstract

The invention discloses a three-dimensional source separated pressure-releasing gas treatment method. The method comprises the following steps of: constructing a gas drainage roadway which is parallel to the return air roadway of a coal face on the outer side of the return air roadway; constructing an elevation borehole from the gas drainage roadway to the direction of a roof crack zone of a maiden area which is positioned in front of the open-off cut of the coal face until the roof crack zone is passed through, constructing a depression borehole which passes through a protected layer to the direction of a bottom crack zone until the bottom crack zone is passed through, and connecting the constructed boreholes with gas drainage pipelines for gas drainage; along with the constant development of the coal face, continually constructing gob boreholes from the gas drainage roadway to a gob which is positioned in the back of the open-off cut of the coal face, and connecting the gas drainage pipelines for the gas drainage until the recovery of the coal face is finished. By draining the gas which is discharged in the pressure releasing process of the protected layer from the elevation borehole on the top of the roadway to the depression borehole at the bottom of the roadway, a separation function is realized, pressure-released gas is prevented from flowing into a protective layer working face, a great amount of air flow is prevented from carrying the gas from the gob to an upper corner, and the gas emission amount of the upper corner is reduced.

Description

technical field [0001] The invention relates to a three-dimensional three-dimensional separate source pressure relief gas treatment method, which is especially suitable for the treatment of excessive gas in the working face of the protective layer caused by the large gas content in the adjacent coal seam and a large amount of release after pressure relief. Background technique [0002] Coal seams are generally buried deep in our country, so about 95% of the mines are mined underground. At the same time, coal seams generally have the characteristics of high ground stress, soft coal quality, low gas permeability, and difficult gas drainage. The gas in the coal seam cannot be successfully extracted before mining, resulting in a large amount of gas released during the mining process of the working face, causing the gas to exceed the limit. , or the outburst danger of the coal seam cannot be eliminated, thus causing danger to the safe production of the coal mine and restricting t...

AI Technical Summary

Problems solved by technology

A large amount of pressure-relieving gas in the lower protected layer will pass through the protective layer and enter the overlying surrounding rock roof fissure area, and be stored in it. When the gob is periodically pressed, the roof fissure area in the gob will be squeezed. pressure, resulting in the influx of gas into the working face of the protective layer, causing the gas to exceed the limit

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