Aiming at the problem of small effective radius and low efficiency of conventional extraction caused by low permeability and difficult permeability enhancement in high gas and hard coal seam, taking 3306 working face of Bofang Coal Mine as the research object, the influence law and mechanism of cutting permeability enhancement on extraction radius were studied by combining coal physical property test, numerical simulation and field test. The results show that the cutting spacing, the radius of the hole and the unloading rate are the core control parameters. The 5 m spacing +0.5 m hole radius is the optimal combination, and the effective extraction radius of 90 d is 4.5 m. Physical parameters such as coal seam firmness constitute inherent constraints. The core mechanism is the chain synergy of ' stress unloading-fracture development-seepage optimization '. After cutting, the stress unloading of coal body exceeds 6 m, the permeability increases by 106.2 times, and the gas flow is dominated by seepage. The research provides technical support for the optimization of extraction radius and efficient extraction of similar coal seams.
郭泽明1，张佳乐2. 高瓦斯坚硬煤层掏槽增透对抽采半径的影响规律及机理研究[J]. 煤炭与化工, 2026, 49(6): 122- 126，131..
Guo Zeming 1, Zhang Jiale 2. Study on the influence law and mechanism of cutting permeability enhancement on extraction radius in high gas and hard coal seam. CCI, 2026, 49(6): 122- 126，131..
