Abstract
Roof tunnel drainage is one of the efficiency methane drainage methods [1, 2]. It is an effective method to realize integrated coal exploitation and gas extraction, and common used in longwall coalface in China [1–4]. The methane drainage result of this method is influenced by the distance from coal seam to roof tunnel, kind of the roof rock, height of coal seam, mining height and stability of the coal seam. So some auxiliary methods need to be used to improve methane drainage effect, when the influencing factors change, such as the distance from roof tunnel from coal seam [5, 6]. And the method of downward boreholes from roof tunnel is valid, which is proved in some coalmine. In this paper, methane concentration field in the gob under the methane drainage method of roof tunnel is calculated by computational fluid dynamics.
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