Research on Sensitive Indexes of Coal and Gas Outburst Prediction for Coal Uncovering Face of Zhaojiazai Coal Mine

In order to indentify rock cross-cut coal uncovering adapting to gas geological features of Zhaojiazhai Coal Mine and critical values and sensitive indexes of coal and gas outburst prediction for heading face of roadway near coal seam, on the basis of testing methane desorption data of 1 mm to 3 mm particle size of coal samples under the conditions of different adsorption equilibrium pressure, we research the critical value and sensitive of cuttings desorption index by mathematical software and on-site verification testing method. We find that the desorption index △h₂ is more sensitive than the value of K₁. The relation between cuttings desorption index and adsorption equilibrium pressure is a power function. The cuttings desorption index △h₂=185 Pa can be taken as critical value of coal and gas outburst risk prediction for rock cross-cut coal uncovering and heading face of roadway near coal seam in Zhaojiazai Coal Mine when gas pressure is 0.6 MPa.