Abstract: The ventilation system of high inclinationangle fully mechanized caving face is complicated， and it is difficult to determine the optimal dust exhausting wind speed because of high inclinationangle and variable wind. In view of this fact， based on gassolid flow theory， a numerical simulation mode for high inclinationangle fully mechanized caving face was established. Via applying FLUENT software， the wind flow regularities and dust distribution， together with the reducing dust mechanism and the optimal dust exhausting wind speed， were investigated under different ventilation modes. The results showed that the dust mass concentration of ascentional ventilation in footway space ranges from 1200 to 1600mg/m3， the dust mass concentration of descentional ventilation ranges from 460 to 600mg/m3. The descentional ventilation is more applicable to the high inclinationangle fully mechanized caving face. The optimal dust exhausting wind speed is 25~28m/s， and the wind speed should be controlled below 30m/s. Experiment was performed in the working face， and the experimental results agree with the simulation results， thus verifying the reliability and accuracy of the numerical results. The research results can be used as theoretical guide for developing specifical prevention measures in high inclinationangle fully mechanized caving face.

Key words: high inclinationangle fully mechanized caving face, ascentional ventilation, descentional ventilation, dust mass concentration, optimal dust exhausting wind speed