Abstract：To investigate the impact feature and dynamic behavior of coal-gas two-phase flow in the process of coal and gas outburst，physical simulation test of coal-gas two-phase flow was carried out by multi-field coupling testing system for dynamic disasters in coal mine. The results show that the outburst pulverized coal is thrown from the working face in a jet shape due to the high-speed airflow. As the distance increases，the solid-phase diffuses and converts into the plug flow，and the deposition amount increases accordingly and concentrates at the end of the roadway. The relative intensity of the outburst is 10%，and pulverized coal with a diameter of less than 0.150 mm accounts for the main part of the outburst coal which indicates that the fragmentation degree of pulverized coal is high. While the outburst is triggered，a large amount of pulverized coal is ejected by the high-pressure airflow from the coal seam to create a large impact force. The impact force near the outburst orifice changes repeatedly，which indicates that the outburst process presents paroxysmal characteristics. In the motion process of two-phase flow，the gas expands completely to form a steeply increasing impact zone. The impact force reaches the largest at 4 944 mm from the outburst orifice and then attenuates along the roadway.
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2019, Vol. 38 
