Research on Sensitive Indexes and Critical Value of Coal and Gas Outburst Prediction in Xinji No.2 Coal Mine

According to the investigation and study on the characteristics of previous coal and gas outburst, it analyzed and obtained that the coal and gas outburst was more sensitive to the indexes of ground stress and gas pressure in Xinji No.2 Coal Mine. The field measurement and laboratory simulation combined analysis methods were applied to systematic analysis on the sensitiveness of outburst prevention prediction indexes, and the critical values were determined. The results showed that: the index of gas pressure was more sensitive than that of gas content for regional prediction; for local prediction, the outburst sensitivity indexes of No.6 and No.13-1 coal seams were that S value>K₁ value>△h₂ value, while K₁ value>S value>△h₂ value in No.8 coal seam.