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钻孔有效抽采半径是煤层瓦斯抽采设计的主要参数。本研究确定了煤层预抽钻孔瓦斯抽采量与影响半径的变化规律,建立了利用瓦斯抽采量确定有效抽采半径的数学模型,并提出了模型参数确定方法。在兴隆煤矿进行了抽采钻孔周围瓦斯压力与瓦斯含量在抽采过程中变化的现场测定,根据模型与现场实测得出兴隆煤矿穿层预抽煤层瓦斯措施在抽采时间一定时的有效抽采半径,现场实测结果与模型计算结果基本一致。
The effective drilling radius is the main parameter of coal seam gas drainage design. The study determined the law of gas drainage and influence radius of pre-pumping boreholes in coal seam, established the mathematical model to determine the effective drainage radius based on gas extraction, and proposed the method to determine the model parameters. In Xinglong Mine, the gas pressure and gas content around the drainage hole during the extraction process were measured in the field. According to the model and field measurements, the effective pumping Mining radius, field measurements and model calculations are basically the same.