Experimental Study of Coal Seam Gas Drainage Radius Based on Numerical Simulation

To the problem of rockburst in deep，and experimental detection of coal seam gas drainage radius experimental was done in Qianjiaying mine of Kailuan，and gas drainage radius of 5# coal seam was detected with pressure index method，the results showed that the gas drainage radius of 5# coal seam more than 1m，and then an effective radius of 5# coal seam was field test with improved content index method，it is between 3～4m，then seepage situation during drainage process was simulated with software RFPA^2D-GasFlow，an effective radius was determined as 3.4m，and the optimum spacing of drainage hole distribution was 4.8m with mathematics analysis，it references for outburst prevention development of Qianjiaying coal mine.