Abstract:In view of the actual problems of increasing mining depth and possible increase of coal seam gas disaster risk in Donghuantuo Mine, the basic gas risk evaluation of coal seam such as the initial velocity of coal gas dispersion, the solidity coefficient of coal body, coal seam gas pressure and coal seam gas content of Donghuantuo Mine 7#、8#、9#、11# and 12# coal seam was obtained through on-site measurement and laboratory tests, and the analytic-fuzzy mathematical comprehensive evaluation method (AHP-FCA) was used to carry out the coal seam gas risk evaluation. The results show that according to the analytic hierarchy method, the weight of gas outburst risk evaluation index can be determined, and it is concluded that coal seam gas pressure has the greatest impact on the gas outburst disaster in Donghuantuo coal, and it is suggested that the monitoring and management of gas pressure should be strengthened. Combined with the fuzzy mathematical comprehensive evaluation method, the comprehensive evaluation of the outburst risk of gas in each coal seam can be effectively evaluated. This evaluation method can quantitatively describe the gas hazard and visually reflect the degree of coal seam danger. The results of each coal seam showed that the outburst risk of gas in each coal seam in Donghuantuo Coal Mine was within a relatively mild range, and the possibility of gas disaster was low, and the prediction results were more consistent with the actual situation.
