Regional Outburst Prevention Test by Coal Seam Infusion Humidification and Permeation Fluid Mechanics Numerical Solution of Parameter Optimization

To strengthen the coal bonding force and plasticity,inhibit the gas irradiation intensity and achieve the purposes of stabilizing the coal body and regional outburst prevention,taking K ₄ coal seam of Tianfu No.3 coal mine in Chongqing as target area,cryogenic liquid nitrogen pore structure analysis experiments,coal wettability experiments and moist corners measurement experiment were carried out,and the feasibility of coal seam infusion was analyzed.The experiments showed that the majority of coal pores were plate-shaped open holes with strong water absorption,wetting corners were less than 90°and had the feasibility of water infusion.The high-pressure infusion test was carried out in the floor rock of deep shaft of Chongqing Tianfu mining company with depth of 850 m after the relief of the coal body reaming,and coal permeability coefficient was measured after relief.Based on measured data,the radial flow mechanics equation of coal seam infusion was established,and the dynamic spatial and temporal parameters of water infusion pressure,time,and infusion radius were optimized and calculated.