Research On Prevention And Control Technology Of Coal Seam Gas Outburst In The Fourth Mining Area Of Sanhekou Coal Mine

Coal industry is the basic industry of national economy and social development in China.Coal and gas outburst is one of the main disasters in coal mines.Aiming at the coal and gas outburst problem in the fourth mining area of Sanhekou coal mine,this paper analyzes and studies the actual production situation of the mine,aiming to prevent and control the coal and gas outburst problem.First of all,the original pressure and gas parameters of the third coal seam in the fourth mining area of Sanhekou coal mine are measured.Through the analysis of the predicted coal and gas outburst indexes,the sensitive indexes of coal and gas outburst in this area are determined.Based on the analysis of the prediction of the outburst risk in the third coal mining area of the fourth mining area,the gas geological statistics method and the comprehensive index method are adopted,and the four mining areas are divided into five geological units with faults as the boundary.Through the risk evaluation of each geological unit,it is concluded that:the first,the second and the fifth areas are non outburst risk areas;the third and the fourth areas are outburst risk areas;according to these units,the outburst prevention technical measures are put forward At the same time,the effect of outburst prevention is evaluated,and the corresponding safety technical measures and management requirements of outburst prevention are formulated.Through the above research and analysis,combined with the data given by the mine,the pre-pumping rate of 2421 working flour gas is 42.04%,the comprehensive index D=-0.783,the maximum residual gas pressure P=0.506 MPa,K1=0.13 mL/g min 1/2.Compared with the critical value of outburst danger evaluation index,the corresponding critical value of outburst danger has not been reached.Therefore,under the existing drainage technology conditions,the gas content of coal seam can be effectively reduced,the gas pressure can be reduced,and the outburst elimination requirement can be met.