Study on Dust Transport Law of Tunnel Compression Ventilation based on Numerical Simulation
In order to solve the problem of large amount of dust pollution during the construction period of tunnel drilling and blasting op-erations,taking the left bank traffic tunnel of Sichuan Kara Hydropower Station as a study object,based on the theory of gas-solid two-phase flow,the tunnel dust diffusion distribution model is constructed by using FLUENT software,and the distribution characteristics of the wind flow field and the transport law of the dust particles are simulated and calculated.The results show that the tunnel wind flow field is divided into three zones:vortex zone,transition zone and stabilization zone,and the characteristics of the wind flow field in differ-ent zones are very different;during the high-speed airflow emitted from the outlet of the duct,the contact section will gradually expand and form an air curtain.The airflow movement will cause the dust mass concentration in the cross-sectional direction of the tunnel to be low on the left and high on the right,but the final concentration distribution will tend to be even.With the increase of wind speed,the dust reduction rate increases,but it may lead to secondary dust.Finally,by considering the actual engineering conditions and construc-tion requirements,the wind speed of 24 m/s is selected as the optimal dust exhaust wind speed.This study provides a reference for the improvement of ventilation system and optimization of dust suppression effect in underground engineering such as tunnel construction.
tunnelsdrilling and blasting methoddustdiscrete phasewind field
万方数据
维普
