Protective Layer Selection and Gas Pre-pumping of Closed Distance Outburst Coal Seams

According to the mining conditions of closed distance outburst coal seams in Jike coal mine,the mining protective layer was selected and its feasibility was proofed based on geological conditions and coal seam gas basic parameters.The large acreage gas pre-pumping program for protective layer and adjacent layer was designed,which promoted the safe and efficient mine production.