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钻孔瓦斯抽采有效半径直接关系到矿井安全生产、瓦斯治理投入、资源的合理利用等多个重要方面,通过ANSYS数值模拟渗流-热相似分析模块对新丰煤矿3种透气性环境下的抽采半径及其相关规律进行研究,发现钻孔抽采在三维空间中存在差异,各个方向上并不完全一样,抽采有效范围内煤层瓦斯压力与抽采时间成严格的负指数关系,煤层透气性系数的提高能成倍的缩短极限抽采时间并增大抽采有效半径,矿井在瓦斯治理与利用过程中应以提高煤层透气性系数为主,这样既可以首先对煤层进行消突,又可以增大抽采有效半径,还可以缩短抽采时间,一举多得。
The effective radius of gas drainage in drilling is directly related to many important aspects such as mine safety production, gas treatment input and rational utilization of resources. Through ANSYS numerical simulation of seepage-thermal similarity analysis module, Mining radius and its related laws, it is found that there is a difference in the three-dimensional space between drilling and extraction in all directions, and the direction of the drainage is not exactly the same. The gas pressure in the coal seam is in strict negative exponential relationship with the extraction time in the effective range of the drainage, The improvement of the sex coefficient can exponentially shorten the ultimate extraction time and increase the effective radius of the extraction. In the course of gas treatment and utilization, the mine gas permeability coefficient should be mainly increased, so that the coal seam can be eliminated first and then Can increase the effective radius of extraction, but also can shorten extraction time, in one fell swoop.