通过扩大钻孔的直径，从而达到增加钻孔的煤层暴露面积和卸压范围，增大钻孔抽排瓦斯量，提高钻孔的抽排效果。
The enlargement of hole diameter increased the exposed area and pressure releasing range of bored coal seam, and raised gas drainage amount and discharging effect from holes.
本文提出了一种全新的综放工作面通风系统：顶层瓦斯巷小煤柱外错底层回风顺槽布置，具体是一种放顶煤工作面顶板排瓦斯巷位置的改进。
This paper proposes a new working face ventilation system: top gas tunnel small pillar outside the bottom return air laneway layout, in other words, which is gas tunnel location evolution.
利用瓦斯抽排孔把井下瓦斯预抽后排到地面，是我国目前煤矿预防瓦斯事故和进行综合利用能源的有效方法之一。
It is one of the effective methods for energy and resources comprehensive utilization to have gas drained to the ground by using gas-discharging hole in China.
采用上述方法已经成功施工23口大口径瓦斯抽排钻孔。
The above stated method was successfully applied to 23 large diameter gas drainage boreholes.
采用上述方法已经成功施工23口大口径瓦斯抽排钻孔。
The above stated method was successfully applied to 23 large diameter gas drainage boreholes.
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