钻爆施工隧道喷雾降尘数值模拟分析

Numerical Simulation Analysis of Spray Dust Removal in Tunnel Construction by Drilling and Blasting

为研究喷雾系统对隧道开挖后粉尘浓度的影响规律,采用Fluent软件建立长度为50m的隧道通风数值仿真模型,研究压入式风管风速、喷射角度、喷嘴数量和喷嘴至掌子面距离对喷雾除尘效率的影响。研究表明:随着风管风速的增加,粉尘颗粒加速运动,并且粉尘浓度最大位置逐渐远离掌子面。增加喷嘴数量可增大喷雾与粉尘的接触面积,提高粉尘颗粒与水雾作用的概率;在设置5个喷嘴且喷射角度为90°的条件下有利于降低粉尘浓度。喷嘴距离掌子面10m时可有效限制掌子面释放的粉尘,提高除尘效率。

To investigate the influence law of spray system on dust concentration after tunnel excavation,numerical simulation model with a length of 50m was established by Fluent software.The influence of press-in duct air velocity,injection angle,number of nozzles and distance between nozzles and palm face on spray dust removal efficiency was studied.The results show that as the wind speed of the duct increases,the dust particles accelerate and the maximum dust concentration gradually moves away from the face of the palm.When the spray angle and the number of nozzles goes up,the probability of the interaction between dust particles and water mist improves.Under the condition of 5 nozzles and 90° injection angle,the dust concentration can be reduced.When the nozzle is 10 m away from the palm surface,the dust released from the palm surface can be effectively limited and the dust removal efficiency can be raised.