Experimental and Numerical Study on the Impact of Coal and Gas Two-Phase Flow on the Antioutburst Door

As the primary antioutburst facility in underground coal mines, the antioutburst door will be severely destroyed under the impact of coal and gas outburst two-phase flow. To comprehensively investigate the mechanical response characteristics of the antioutburst door under coal and gas outburst two-phase flow, the coal and gas outburst experiments were carried out using the self-designed device, and the simulation research was conducted using the ANSYS Workbench software. The results show that a large amount of coal powder pours into the roadway driven by the gas flow, with the patterns of suspension flow, stratified flow, and slug flow. Most of the coal powders accumulate in front of the first antioutburst door. When the antioutburst door is fixed around, the stress at the surrounding and middle area of the antioutburst door is the highest, and the displacement at the middle area of the antioutburst door is relatively large, resulting in the most severe deformation. Therefore, the antioutburst door can be divided into three regions, that is, the central area of the antioutburst door (Region I), indicating the weakest region; the middle part of the four sides (Region II), indicating the weaker region; and the remaining area (Region III), indicating the nonweak region. The research of this paper has certain significance for understanding the mechanical response characteristics of the antioutburst door under the impact of coal and gas outburst two-phase flow so as to optimize the structures of the antioutburst door.