钻孔抽采煤层瓦斯是目前矿井常用的抽采措施之一，在矿井采掘活动中起着至关重 要的作用。为了解决煤矿井下抽采钻孔直径不统一、布孔间距不合理的问题，避免在设计抽采钻孔布置过程中出现空白区域或钻孔的无效重叠，本文采用抽采量法研究顺层钻孔的有效抽采半径，以现场数据为基础，通过理论分析和数学计算的方法研究了2种常见孔径（φ94 mm、φ108 mm）对有效抽采半径的影响。研究结果表明，钻孔瓦斯抽采纯量和抽采时间变化符合指数方程，同时有效抽采半径随钻孔直径的增大不断增大；当钻孔直径相同时，钻孔之间的布置间距越大，实现瓦斯抽采达标的预抽时间越长；当钻孔之间的布置间距相同时，直径越大的钻孔实现瓦斯抽采达标的预抽时间越短。该研究为抽采设计、工期计算和经济性提供重要参考。

 Borehole extraction of coal seam gas is one of the commonly used extraction measures in mines, which plays a vital role in mining activities. In order to solve the problems of non-uniform diameter of drainage boreholes and unreasonable spacing of boreholes in underground coal mines, and to avoid the invalid overlap of blank areas or boreholes in the process of designing the layout of drainage boreholes, this paper uses the extraction volume method to study the effective extraction radius of bedding boreholes. Based on the field data, the influence of two common apertures ( Φ94 mm, Φ108 mm ) on the effective extraction radius was studied by theoretical analysis and mathematical calculation. The results show that the variation of gas extraction purity and extraction time conforms to the exponential equation, and the effective extraction radius increases with the increase of borehole diameter. When the diameter of the borehole is the same, the larger the spacing between the boreholes, the longer the pre-drainage time to achieve the gas extraction standard ; when the arrangement spacing between boreholes is the same, the larger the diameter of the borehole, the shorter the pre-drainage time to achieve the gas extraction standard, which can provide an important reference for the extraction design, construction period calculation and economy.