Coal pore characteristics in different coal mine dynamic disasters

The pore characteristics of coal have an important influence on the dynamic disaster of coal mine. Considering the disaster caused by large deformation of coal-rock mass, the influence of pore deformation and pore distribution also needs further study simultaneously. In this paper, the pore characteristics of gas outburst coal and bursting liability coal are analyzed and compared. The pore structure, the pore volume, and the pore compressibility associated with different dynamic disasters were comprehensively analyzed. The experimental data of mercury intrusion were corrected by liquid nitrogen adsorption experiment data, and the distribution of pore volume was obtained. Moreover, the fractal dimension of partial micropore was calculated, and the pore compressibility of coal was determined according to the fractal dimension. The results show that there are great differences in the pore characteristics between outburst coal and impact proneness coal, which are also one of the factors leading to different disasters in coal mine.