Evolution of mining-induced enhancement and distribution of gas permeability in coal seam and surrounding rock.

Based on the background geological information at Panyi Coal Mine, a physical simulation on protective seam mining was conducted in this study. The simulation obtained the volumetric strain distribution in the mining area through capturing the locations of the markers in real time and calculating the coordinates of pixels using Matlab software, which can effectively describe the distribution of expansion-compression in the mining area. Furthermore, a comprehensive stress-strain permeability test was carried out with the establishment of coupling equation between volumetric strain and permeability. The study shows that with the advance of working face, the distribution of both volumetric strain and permeability also demonstrates a consistent dynamic distribution process. However, the permeability evolution of upper protective coal seam lags behind that in the protective coal seam. [ABSTRACT FROM AUTHOR]