Abstract: In order to investigate the influence of artificial ventilation on the wind flow field in deep open pit mine under different natural wind speeds， FLUENT was used to simulate the wind field in deep sunken open-pit mine. The results show that the volume of recirculation flow before and after artificial ventilation is not obvious when natural wind speed is 2 m/s. The range of recirculation flow below the closed loop is small when natural wind speed is 5 m/s， so the reduction of recirculation flow is not obvious. The low-pressure zone and the low-speed zone near the leeward slope change significantly when natural wind speed is 3 m/s and 4 m/s， and recirculation flow decreases obviously. The air exchange rate increases slowly when natural wind speed is low or no wind. The air exchange rate is significantly increased when natural wind speed is not less than 2 m/s. This is basically consistent with the volume change trend of recirculation flow， which verifies the feasibility of artificial ventilation scheme. The wind flow field in the deep sunken open-pit mine was significantly improved after artificial ventilation measures were adopted.

Key words: Deep sunken open-pit mine, Wind flow field, Artificial ventilation, Natural wind speed, Recirculation flow, Air exchange rate