Study On Coal Permeability And Gas Mirgration Law Under High Intensity Mining In Lu An Mining Area

Based on the significant impact of mining-induced stress to the coal permeability, this thesis has studied mining-induced stress and the alteration of the coal permeability with many site measured technique, for example, SF6 tracer technique. On the basis of the analysis of mining-induced stress filed and the theories about gas infiltration flowing in the coal; studied the flowing format of gas in the coal on mining-induced condition with numerical simulation; and analyzed the relationship during mining-induced stress, permeability and gas pressure. The regularities of distribution of mining-induced stress filed on high intensity mining condition been summarized, and it is considered that the moving of higher stratum can move two times, the abutment pressure has more range of action and centralized; apply the SF6 tracer technique to research the change of coal permeability on mining-induced condition, and do the site observation at WuYang Coal Mine, Lu An Mining Area, and studied the impact between the mining-induced and the coal permeability during it was working; Simulated the flowing format of gas in the coal with FLAC3D, studied the change of gas pressure in the coal; By analyzing and regressing the coal bed gas pressure and the abutment pressure, it was find that the gas pressure and abutment pressure at the same position follow the ExpAssoc distribution, they can be described by the same formula. All of the results are the reference of prevention of the gas disaster control on high intensity mining.