摘要
钻孔瓦斯抽采半径主要与煤层瓦斯含量、透气性系数、抽采钻孔直径及负压、抽采目的和时间等因素有关。传统的抽采半径确定方法对于透气性较好、煤层测压条件较佳时可能得到考察结果,但效率较低;当煤层透气性差时,测定成功率极低,实用性差。为此,在已知煤层瓦斯含量基础上,选用直接测定钻孔瓦斯动态抽采流量,按照抽采目标确定抽采率进而确定钻孔不同抽采时间的抽采半径。实践表明,该方法具有较强的实用性。
The gas extraction radius by boreholes is mainly related to the factors such as the coal-seam gas content,the air permeability coefficient,the diameter and negative pressure of gas extraction borehole,the gas extraction purpose,time and so on.A certain results can be obtained for the coal seam having better permeability and pressure measuring condition with the traditional determination method for gas extraction radius,but its efficiency is rather low;when the coal seam has poor permeability,the success rate of the measurement is extremely low and its applicability is poor.For this reason,direct measuring method was used for the measurement of dynamic gas extraction flow from boreholes on the basis of the coal-seam gas content being known,the extraction rate was determined according to the extraction purpose,and then the extraction radius by the borehole at different extraction time was also determined.The practice indicated that this method is practical and easy to generalize.
出处
《矿业安全与环保》
北大核心
2012年第4期43-45,48,共4页
Mining Safety & Environmental Protection
