Numerical Simulation Analysis of Spray Dust Removal in Tunnel Construction by Drilling and Blasting
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.
tunnel engineeringdrilling and blasting constructionwater mist dust removaldust concentrationnumerical simulatio
万方数据
维普
