Study on the Regularity of Dust Dispersion at the Shatantou Tunnel Face Based on CFD-DPM Method
Dust is a significant factor affecting the health of tunnel construction workers and the safety of excavation operations.To understand the relationship between wind speed and dust dispersion regularity in tunnels,this study focuses on the Shatantou Tunnel and proposes a numerical modeling method based on CFD-DPM,incorporating a DEM collision model.A 3D finite element model of the tunnel is constructed in ANSYS Fluent to investigate airflow,dust dispersion,and dust concentration distribution at the breathing plane within the tunnel under wind speeds of 9 m/s,12 m/s,15 m/s,and 18 m/s respectively.The results show that the tunnel has two high wind speed zones and a central low wind speed zone.The movement of high-concentration dust clouds is approximately linearly related to the wind speed at the ventilation outlet.The time required for dust to fully disperse from the tunnel under the four wind speed conditions is 150 s,110 s,90 s,and 80 s,respectively.Based on the relationship between ventilation time and dust concentration in the tunnel,the ventilation process can be divided into the initial ventilation period,the mid-ventilation period,and the stable ventilation period.The highest dust concentrations at the breathing plane under different wind speed conditions are 111.02 mg/m3,93.26 mg/m3,71.24 mg/m3,and 67.73 mg/m3,respectively.Field testing shows that the measured data align well with the simulation results.This study provides a basis for rational ventilation design and safe construction of the Shatantou Tunnel.
万方数据
维普
