<p>Coal and gas outburst disaster seriously restricts the safe development of deep coal resources. This study aimed to elucidate the evolution characteristics of dynamic behavior and two-phase flow migration mechanism throughout the various stages of outburst. The dynamic characteristics of fluids at different outburst stages were analyzed in terms of impact force and static pressure primarily based on physical simulation tests of outbursts. Based on gas dynamics, a complex wave system distribution model of the turning structure was constructed, and a numerical simulation revealed the migration mechanism of outburst fluids within the turning structure. The results show that the shock in the stage1 shows an evolutionary trend of multi-peak oscillations. Coal–gas two-phase flow in the stage2 mainly has strong disaster-causing characteristics at the front end and middle of the straight roadway, and the impact force has a sudden and intermittent steep increase-drop phenomenon. Impact force decline process has a recovery phenomenon, the larger the solid–gas ratio, the faster the impact force attenuation. Coal powder can promote the attenuation of static pressure, and the larger the solid–gas ratio, the greater the attenuation. The fluid in the high-velocity jet region is fast and unevenly distributed, and the static pressure is negatively distributed, with expansion-compression phenomenon. In the turning roadway, there is a steep increase in velocity, and the distribution is strong–weak, which is consistent with the phenomenon of steep increase in impact force in the test. The research results are of crucial guiding significance for accurately assessing the impact range of outburst accidents, optimizing the design of disaster prevention facilities, and formulating emergency rescue plans for accidents.</p>