东大煤矿采空区瓦斯抽放设计与应用

Design and Application of Gas Drainage in Goaf of Dongda Coal Mine

为治理采空区瓦斯涌出量过多导致回采工作面瓦斯浓度超限问题,对东大煤矿14151工作面采空区瓦斯抽放钻孔参数进行设计。随着工作面的推进,在采空区会形成冒落拱,在冒落拱附近裂隙较为发育,高位钻孔布置层位应在冒落带上方,裂隙带中下部位,每个钻场布置8个抽采钻孔,钻场间距取60 m。通过设计合理钻孔参数可以有效地提高瓦斯抽采效果。

In order to governance the problem that the gas concentration in the working face exceeds the limit caused by too much gas emission from the goaf,the borehole parameters of gas drainage in the goaf of the 14151 working face in Dongda Coal Mine are designed.With the advance of the working face,a caving arch will be formed in the goaf,and the cracks near the caving arch will be more developed.The high boreholes should be arranged above the caving zone,and in the middle and lower part of the fracture zone,8 extraction boreholes should be arranged in each drilling site,and the distance between the drilling sites should be 60 m.The effect of gas drainage can be effectively improved by designing reasonable drilling parameters.