Numerical simulation study of affecting spraying and dust reduction in deeply buried tunnels constructed by drill-and-blast method
Tunnel construction projects in China have developed rapidly,and significant dust hazards are associated with drilling and blasting construction.To improve the effectiveness of spraying to reduce dust in tunnels,this article uses digital simulation and a tunnel model was created using ANSYS.The variations in dust mass concentration distribution under different conditions,such as surrounding rock temperature,jet velocity,and nozzle diameter,were investigated in the study.The results show that as the surrounding rock temperature increases,dust movement becomes more intense,which significantly affects dust reduction efficiency.The dust capture effect of atomized water droplets decreases with the increase in surrounding rock temperature.With the increase of water jet velocity,the water pressure in the jet pipe increases,improving the dust capture effect of the droplets.Dust reduction efficiency decreases with increasing nozzle diameter.When the nozzle diameter is too large,the ability of water mist to capture particles weakens.Conversely,a smaller nozzle diameter improves dust reduction efficiency.However,if the nozzle diameter is too small,too much splash water spray rather than affect the efficiency of the dust.
drilling and blasting constructiondeep buried tunnelsspraying to reduce dustnumerical simulationsurrounding rock temperaturejet velocitynozzle diameter
万方数据
维普
