Study on Law of Air Flow Field and CO Migration in Tunnel Construction by Drilling and Blasting
In order to investigate the CO migration caused by tunnel drilling and blasting under pressure ventilation,taking the traffic tunnel project around the dam of Kala Hydropower Station as an example,the CO component transport model of the tunnel was established by using the software Fluent according to the theory of computational fluid mechan-ics.The accuracy of the model was verified using field monitoring data.The results show that the main driving force of CO migration is the return zone away from the wind duct,and the entrainment and entanglement vortex zone has a strong hindering effect on CO migration.By comparing the changes of CO concentration between upright breathing belt height of 1.5 m and sitting breathing belt height of 0.3 m,it can be found that the lower the height,the lower the CO concentra-tion is,and the slower the reduction rate of CO concentration is.The established CO diffusion model can accurately re-flect the law of CO diffusion migration,which can provide a reference for the ventilation design of practical engineering.
drilling and blastingpressure ventilationCO migrationair flow fieldfield monitoring
万方数据
维普
