Study on the gas emission width of coal seam pressure released by goaf in the deep mine

Abstract

The technology of driving along goaf has been widely used in the prevention of high ground stress and coal-gasoutburst in coal mining in our country. In this paper, the 11-2 Coal Seam of zhujixi coal mine is taken as the research object. Based on the test of drilling cuttings and residual gas content at different depths of solid coal at the goaf side and the research on the distribution law, it is concluded that the effective pressure relief drainage belt width at the goaf side of 11-2 Coal Seam after mining is 29m. Field practice has been carried out in the adjacent working face. The results show that the predicted indexes measured during the coal roadway driving period do not exceed the specified critical value, which verifies the rationality of the width of the discharge zone. The results provide a theoretical support for the reasonable layout of the continuous working face, improve the driving speed of the coal roadway, reduce the cost of gas control, improve the economic benefits of the mine, and ensure the safety production of the mine.