Study on Ventilation Technology of Long Distance Single Head Excavation Construction in Qinling Tunnel
With the increasing distance of single-head excavation in hydraulic tunnel,a large number of harmful gases produced by mechanical operations such as blasting slag are difficult to go out of the tunnel,and the safety of operation and the health of personnel in the tunnel are seriously affected.Ventilation in the tunnel is one of the important factors to ensure the construction progress,safety and environment.Effective ventilation scheme and ventilation measures make the harmful gas out of the tunnel quickly,which is conducive to the good working environment and personnel safety in the tunnel.Taking the No.4 branch tunnel and the upstream and downstream main tunnel of Qinling water conveyance tunnel as an example,the key technology of long-distance construction ventilation of hydraulic tunnel is studied,the design optimization measures are put forward,and the ventilation emergency measures are summarized.The research results can provide reference for the theoretical research and engineering practice of construction ventilation technology in the drilling and blasting section of diversion tunnel.
Hydraulic tunneldrilling and blasting methodsingle head excavationlong distance ventilation
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