Abstract: In order to study gas emission variation of tectonic coal during mining process along with change of drilling depth, gas flow of self-developed continuous flow method prediction system was adopted to measure the gas emission and drilling depth of boreholes with a drivage face of Xuehu coal mine 2104 roadway as a experimental object. Then based on initial gas emission trends, locations of borehole tectonic coal ahead were predicted. The results show that when drilling into coal with primary structure, gas emission of boreholes increases with the increase of drilling depth, and gas emission curve is stable, but when drilling into tectonic coal, it increases rapidly with a steeper curve which would come to a sudden change point at a drilling distance of 9.9 m and will reach maximum value of 89.9 L/min at 10.2 m, 2.05 times of normal value. With No. 3 borehole as an example, the accuracy and precision of prediction method are verified by mining activities.

Key words: crushed zone, gas emission from borehole, tectonic coal prediction, continuous flow method, gas desorption