In order to grasp the influence of heavy haul train speed on the airflow migration and dust charac-teristics of the tunnel entrance section,and to provide technical support for dust suppression in railway tun-nels,in this paper,with Liangjiashan tunnel as the research object,the evolution law of pressure field and airflow field in the entrance section of a heavy haul train entering the tunnel at different speeds was simula-ted and analyzed.The trajectory and concentration distribution of coal dust particles in the entrance section of tunnel were explored.The results show that when the heavy haul train enters the tunnel,the higher the train speed,the positive pressure field in front of the train and the negative pressure field around the body increase,and the eddy current area and wind speed at the tunnel entrance increase.After the heavy haul train enters the tunnel completely,the coal dust particles in the space diffuse in a high-speed and disorderly manner in the two modes of internal rotation and external rotation.In the same wake area section,the time distribution of coal dust concentration and maximum coal dust concentration at different monitoring points is different.The research results are helpful to understand the influence of the running speed of heavy haul trains on the airflow migration and dust characteristics of the tunnel entrance section,and have guiding sig-nificance for the prevention and control of coal dust in the entrance section of Liangjiashan tunnel.
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