针对寺河煤矿西井区3号煤层的瓦斯抽采问题，本文结合矿井煤层开拓开采及瓦斯赋存情况，对煤层抽采钻孔的有效抽采半径进行确定。探讨了瓦斯压力法和瓦斯储量法的优劣，采用瓦斯储量法测定有效抽采半径，测定结果为在抽采时间为270 d时，抽采半径为10.1 m，并建立了抽采天数与有效抽采时间的数学模型。利用COMSOL软件建立了二维单孔瓦斯抽采物理模型，对抽采过程进行了模拟分析，发现模拟的有效抽采半径与储量法测定结果相似，且抽采时间越长，有效抽采半径越大，钻孔周围瓦斯压力随时间推移逐渐降低。

In view of the gas extraction problem of No.3 coal seam in the west well area of Sihe Coal Mine, this paper determines the effective extraction radius of coal seam extraction boreholes in combination with the development and mining of coal seam and gas occurrence. The advantages and disadvantages of gas pressure method and gas reserve method are discussed. The effective extraction radius is determined by gas reserve method. The results show that the extraction radius is 10.1 m when the extraction time is 270 d, and the mathematical model of extraction days and effective extraction time is established. A two-dimensional single-hole gas extraction physical model was established by COMSOL software to simulate and analyze the extraction process. It was found that the simulated effective extraction radius was similar to the results of the reserve method, and the longer the extraction time was, the larger the effective extraction radius was, and the gas pressure around the borehole gradually decreased with time.