Experimental analysis and numerical simulation of gas group migration regularities

In order to research the evolution regularities of spatial and temporal distribution of gas group in the process of gas migration along the roadway, the experimental system was set, according to the similarity of gas group generated by abnormal gas extrusion and black powder blasting. The experimental results showed that the spatial and temporal distribution law of gas concentration on vertical section of the tunnel conformed to negative exponential function. The simulated curves of gas concentration on vertical section generated by the numerical simulation of FLUENT on the real circumstance underground mining were similar to the experimental curves. Meanwhile, the peak attenuation law of the gas concentration on the cross section conformed to power function. Based on the minimum and maximum of gas explosion concentration, and the concentration peak value on the cross section, the roadway was divided into three regions, namely, explosion threat region, explosion danger region and safety region, which could provide a theoretical basis for the security setting of electromechanical equipment in the process of underground mining.