Evolution of the roof caving and fracture zones during mining of close range coal seams.

This study employs an integrated methodology combining slip line field theory, FLAC3D numerical simulation, and hydraulic injection testing to systematically investigate the evolutionary characteristics of roof two zones under repeated mining conditions in close range coal seams No.9 and 10 (average interburden thickness is 10.2 m).

Experimental and Simulation Study on the Explosion of a Coal/Methane Mixed System.

This study investigates the microscale suppression mechanisms of four powder explosion suppressants on coal dust/methane (CH) mixed system explosions. Combining experimental and numerical simulation methods, we explore the gas-phase reaction processes and the role of free radicals in the explosion suppression. Results show that all suppressants reduce the maximum explosion pressure and pressure rise rate, with MPP being the most effective, reducing pressure by 38%.