高瓦斯厚煤层分层充填开采中瓦斯运移规律研究

Gas Migration Law in Layered Filling Mining of High Gassy Thick Coal Seams

以高河煤矿E1302工作面为例,系统研究了高瓦斯厚煤层分层充填开采过程中煤层瓦斯的运移方式及涌出规律。研究结果表明:煤体孔隙率为5.3%,充填体孔隙率为2.1%,充填体的孔隙率远低于煤体;相较于煤体,充填体更为密实,但其渗透率却远高于煤体,充填体相对于煤体更易于瓦斯流动;工作面瓦斯涌出的主要来源是下分层煤体;开采60 d内,煤层的绝对瓦斯涌出量由开采初期的0.997 0 m^(3)/min下降到0.112 5 m^(3)/min。

Taking E1302 working face in Gaohe Coal Mine as an example,a systematic study was conducted on the gas migration and outburst laws in coal seams during the coal mining process with the layered filling mining method in high gassy thick coal seams.The research results show that the porosity of coal is 5.3%,the porosity of filling material is 2.1%,and the porosity of filling material is far lower than that of coal;compared with coal,filling material is denser but its permeability is much higher than that of coal,which is more conducive to gas flow;the main source of gas outburst at the working face comes from the lower layered coal seam;within 60 d of mining,the absolute gas outburst rate of the coal seam decreased from 0.9970 m^(3)/min at the beginning of mining to 0.1125 m^(3)/min.