Study On Coal And Gas Outburst Characteristics And Regional Prediction Of Dingji Coalmine

Coal and gas outburst is a complex mine dynamic phenomenon, Coal and gas outburst is the interaction results of the stress, coal gas pressure and the structure mechanical properties of coal. However, the power phenomenon characteristic of each mine have a certain degree of particularity.Huainan Dingji coalmine is the papers'research object, first, on the basis of field test data and theoretical analysis, come to the 11-2 coal seam gas deposit law and analysis of affecting factors of gas deposit, gas geological theory as a guide, at the same time analysis of dynamic phenomena characteristics of Dingji coal mine. Then for the outburst special nature of Dingji 11-2 coal seam, study out the coupling situation of stress and gas stress of Dingji coal seam using the first law of thermodynamics, and calculated the relation between stress and gas stress when outburst occurs, come to the relationship between gas content and depth using mechanical calculation when outburst occurs, combined with the gas deposit of 11-2 coal seam, coming to the critical value of gas content is 4.6m~3/t, coming to the critical value of gas content is 4.74m~3/t using the physical simulation laboratory of gas content and outburst desorption index, and coming to the critical value of gas content is 4.5m~3/t by the mean of the gas content near underground outburst point and tracking study, finally the critical value of gas content is 4.5m~3/t by the above method, and prediction the 11-2 coal seam outburst area, to provide a theoretical basis for effectively preventting coal and gas outburst of Dingji coal mine.