Abstract
Characteristics of gas emission in face 40108 were analyzed. The results show that the high-position tunnel system and the grouting system are the effective gas control systems, and 83% gas emission rates in face 40108 come from gob. When monitoring points away from coal face about 33-38m and 78-93m in strike direction, gob gas concentrations reach to 5% and 10%, respectively. The relative gas emission rates decrease with a negative exponential function when the daily outputs or daily advancing rates increase. With the increased air flow rate in face 40108, the absolute gas emission rates in return airway increase coinstantaneous, while it is almost remain unchanged in coal face.
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