Dynamic mining and excavating succession for the combined mining of coal seam group in coal and gas outburst mine

According to the characteristics of combined mining of coal seam group in the highly gassy and out-burst coal mine,a dynamic succeeding method is put forward for the mining and excavation succession.The index system of mining and excavation succession was established by analyzing the safety and economic factors.The weight of each index was calculated using AHP method.Based on the fuzzy comprehensive evaluation method,the optimum succession face in the residual working faces can be determined if all the residual working faces are queued.Using the time reverse method,the heading faces were queued by the working face succession and gas controlling technologies.The practical application shows that the mining and excavation succession can be adjusted with time by the dynamic mining and excavation succession method,which is practically scientific,reasonable and feasible.