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在分析现有瓦斯抽采半径测定方法的基础上,选用直接测定钻孔瓦斯抽采流量的方法,按照抽采目标确定抽采率进而确定不同抽采时间钻孔抽采半径。然后再测定离抽采钻孔不同距离的瓦斯含量,利用瓦斯含量对所测得瓦斯抽采半径进行验证。对于卧龙湖煤矿8#煤层,瓦斯抽采半径随抽采时间的延长而增大,但增大速度逐渐减小,并最终趋于一个。例如,抽采30 d时,瓦斯抽采半径为2.59 m;抽采90 d时,瓦斯抽采半径为3.37 m。实践表明,该方法具有较强的实用性。
Based on the analysis of the existing gas drainage radius measurement methods, the method of directly measuring the gas drainage rate of borehole is selected, and the extraction rate is determined according to the extraction target so as to determine the drilling radius at different extraction time. Then, the gas content at different distances from the drilling hole is measured, and the measured gas drainage radius is verified by the gas content. For Wulonghu 8 # coal seam, the radius of gas drainage increases with the increase of drainage time, but the increasing speed gradually decreases and finally converges to one. For example, the gas drainage radius is 2.59 m at 30 days of extraction and 3.37 m at 90 days of extraction. Practice shows that the method has strong practicality.