基于瓦斯含量的相对压力测定有效抽采半径研究

Determination for effective radius based on relative pressure grouping of gas content

基于瓦斯压力和瓦斯含量的抛物线方程,推导了瓦斯压力、瓦斯含量与预抽率之间的关系,根据瓦斯含量的大小确定了两种有效抽采半径的评价指标。结合石泉煤业30108运输巷瓦斯含量参数,确定有效抽采半径评价指标为0.38 P,通过分组测定得到30108运输巷有效抽采半径在80 d左右时达到了2 m,抽采影响半径在85 d时达到了4 m,并通过分组相互验证测定结果;分析得出煤层钻孔抽采影响范围随着抽采时间的延长,抽采影响范围逐渐减小直至不再增加。

shandong,266590;2.Shanxi Shiquan coal limited liabity company,Changzhi,Shanxi,046000)Abstract:Based on the parabola equation of gas pressure and gas content,the relation between gas pressure,gas content and pre extraction rate was deduced.Based on gas content,two effective evaluation indexes of extraction radius are determined.Combined with Shiquan coal mine 30108 haulage way gas content number,determine the evaluation index for effective drainage radius was 0.38 P.By grouped determination for effective radius of 30108 haulage way o reached 2m at about 80d,influenced radius reached 4m at about 85d,and through the packet mutual authentication results reliable.Analysis of the effect of mining range with increasing drainage time pumping coal seam drilling,got the pumping effect decreases gradually until no longer increases.