Abstract: In order to manage the exceeding gas in the upper corner induced by the low-level enrichment gas effectively, the method of controlling the low-level enrichment gas is proposed. Combined the test mine mining conditions, parameters are designed about the along-strike low-level drilling drainage final hole location, drainage final hole location, the space of drill hole, the length of drilling, and so on. According to the site investigation, a reasonable suction pressure of the drainage system is determined. Application fluent numerical simulation software simulates the layout effects of the given low-level drilling. The results show that the along-strike low-level drilling significantly reduces the gas concentration above the 15 coal seam 15m area; while effectively reducing the gas concentration of the upper corner and the gob. To investigate the drainage effects of the along-strike low-level drilling, the results show that after the implementation of the along-strike low-level drilling, the gas concentration of the upper corners, coal faces and along the groove of the track are down 0.4 % or less, the problem of the exceeding gas of the face has been effectively solved.

Key words: gas enrichment law, the along-strike low-level drilling, suction pressure of the drainage, numerical simulation