采用高位钻孔和仰角钻孔抽放瓦斯技术，有效地防止了瓦斯超限。
High position bores and elevation bores methane drainage technique can prevent gas problem successfully.
高位钻孔抽放最主要的影响因素是合理层位选择，其钻孔参数应根据采空区冒落带及裂隙带高度来设计。
The reasonable layer selection is the main influencing factors for gas drainage by high level borehole, the borehole parameters is based on the caving & fracture zone height of gob.
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