Outburst Elimination Evaluation of Drillings Along Seam in Coal Face

In order to eliminate the coal and gas outburst danger at 15111 working face in shigang coal mine, the parallel drilling along seam and the cross-grid drilling are adopted to implement the gas drainage. According to the standards of Coal Mine Safety Rules and Basic Indexs of gas Drainage of Coal Mine (AQ1026-2006), drilling index, gas index and gas pre-drainage rate are adopted to evaluate the effect of outburst elimination, at the same time, the reliability of the evaluation results is analyzed. Datum show that the layout of pre-drainage drillings is reasonable, the drilling quantity of per ton coal is 0.136 m/t, no blank zone is left; the residual gas content is 1.70~7.94 m³/t, the residual gas pressure is 0.09~0.46 MPa; and the gas pre-drainage rate is above 30%. Results show that the effect of outburst-elimination measures in 15111 working face is obvious, the outburst danger has been removed and it is feasible to implement safety mining.