Gas Migration Law in Layered Filling Mining of High Gassy Thick Coal Seams
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 0.997 0 m3/min at the beginning of mining to 0.112 5 m3/min.
high gassythick coal seamlayered filling mininggas migration
NETL
NSTL
万方数据
维普
