| Coal and gas outburst is one of the greatest disaster of mine production safety. Prevention of coal and gas outburst in coal mines in the daily work of the important and difficult. As judged by prominent predictor of gas outburst important parameter plays in conflict prevention work in the mine a crucial role. No. 11 coal seam in a mine in Guizhou in the actual production, the critical value predictor used is not very accurate, and sometimes there will be a value greater than the critical value of the test, but not outstanding or no abnormal outstanding dynamic phenomena. Sometimes there are significant predictors of the presence of less than threshold, but abnormal dynamic phenomena or phenomena occurring outstanding. In order to determine if a mine in Guizhou No.11 coal seam gas outburst prediction index sensitivity analysis of the geological characteristics and No. 11 coal seam gas outburst law, and the law is closely related to gas outburst prediction index selected as the main object of study, in the gas comprehensive prominent hypothesis basis, before and after taking the pre-pumping gas outburst prevention measures and other changes in the geological formation parameters close to focused inspection, tracking test, and qualitative analysis combined with quantitative analysis method of gray relational analysis by means of selected indicators sensitivity analysis, cuttings desorption index K1 is a sensitive indicator of a mine in Guizhou No. 11 coal seam.Guizhou mine in a coal seam No. 11 Lane and collected 11112 wind and 11112 machine road heading face fresh coal wall coal, gas desorption experiments carried out, to determine the size of the initial 11 coal seams Sensitive Index K1 threshold, after which the "three rate " analysis in the laboratory analysis of critical value to determine the final size of the critical value of 0.66, and 11112 through 11 coal seam roadway excavation working face effect checks to ensure the reliability and security of critical value. |
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