Study on pore structure and adsorption properties of coal and microscopic action mechanism of outburst.

Coal and gas outburst is a complex dynamic phenomenon happened in the underground of coal mines, and it has been a serious threat to the safe and efficient production of mines. To investigate the intricate mechanisms at play, a large-scale coal and gas outburst test was conducted based on the prototype of outbursts induced by coal uncovering. Coal samples were obtained through isometric excavation, grinding, and sieving, followed by an analysis of their pore structure and gas adsorption properties. Furthermore, the microscopic mechanisms underlying the disaster caused by the deterioration of coal due to the combined effects of in-situ stress and gas pressure were examined using fracture mechanics theory. The research findings aim to enhance the foundational theory of coal and gas outbursts and provide technical references for prevention efforts.