应用RFPA2D-Flow软件,对影响钻孔瓦斯抽采效果的钻孔直径、抽采时间和抽采负压进行了数值模拟研究,分析了瓦斯抽采过程中煤层瓦斯的径向流动情况。结果表明:增大钻孔直径能够使钻孔周围煤体卸压范围增加,大幅度提高煤层瓦斯抽采效果;随着抽采时间增长,瓦斯抽采效果越好,但抽采效率会降低;抽采负压降低,抽采半径增幅较小,对瓦斯抽采效果影响不大。 The application of RFPA2D-Flow software was used to simulate the borehole diameter, extraction time and extraction negative pressure that affect the gas drainage in boreholes. The radial flow of gas in coal seam during gas drainage was analyzed. The results show that increasing the borehole diameter can increase the pressure relief range of coal around the borehole and greatly improve the gas drainage effect of the coal seam. As the extraction time increases, the gas drainage effect is better but the drainage efficiency will be reduced. Extraction of negative pressure to reduce the pumping radius smaller increase, little effect on gas pumping effect.