| Through detailed description, the mathematical model of gas distribution and migration for collapsed zone in different mining boundary conditions has been built, and its rule has been revealed in the high strength rapid conditions. Based on the measured data, gas source, gas emission ratio, gas flow and distribution rule have been summarized. The main mining technology factors of influencing gas emission for goaf of coal mine, such as air volume, air pressure, promoting speed and ventilation system, have been comprehensively analyzed. By goaf of coal mine gas migration numerical simulation, the concrete workface has been simulated, then gas distribution and migration rule for collapsed zone in the high strength rapid conditions have been revealed. The results have provided reliable theoretical basis for gas control of goaf of coal mine. |
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