Study of the Formation and Propagation Characteristics of Shock Wave and Gas Flow of Outburst at Straight Roadway

Shock waves and gas flow caused by outburst is destructive.Firstly,we analyzed the forma-tion process of outburst shock waves and gas flow.Then movement process of shock waves and gas flow was simulated by establishing geometrical model of the straight roadway and setting the initial conditions,and the pressure,speed of shock waves and gas flow,the relative concentration of gas dis-tribution at different times in the roadway were obtained.Simultaneously,average pressure and speed of shock waves and gas flow at different time in roadway were analyzed.From the simulation results,some qualitative and quantitative conclusions were obtained.Lastly,experimental system for outburst shock wave was constructed;shock wave propagation at straight roadway was studied by the experi-mental research.The results show gas flow and shock wave with higher speed can be formed induced by outburst;Compared with initial coal seam gas pressure,the pressure of gas flow and shock wave de-clines sharply.The intensity of gas flow and shock wave will attenuate at straight roadway,which de-cays more slowly earlierly,and attenuates faster in the late.