Study On The Application Of Separated Gallery And Duct Jiont Construction Ventilation In Super-Long Tunnel

Tunnel for the current use of inclined or horizontal holes as an auxiliary tunnel construction method of tunnel construction is proposed separate joint-type construction of tunnels and the ventilation pipe. Relying on long-Hung tunnel project, the partition of the kinds of ventilation duct tunnel construction ventilation were studied. Axial fan according to different conditions, testing the wind baffle duct, air pressure changes, the partitions within the partition duct leakage rate of air duct wall surface friction coefficients were determined that the tunnel ventilation is feasible partition. Numerical simulation of three-dimensional model of the pipeline and ventilation were studied in different divisions of the wind warehouse location, the length of the wind position, axial fans and the relative position of the inclined wind, air pressure a comparative analysis of the impact of obtained the most reasonable ventilation arrangement, greatly improved through the field-proven ventilation. The mathematical model and the traditional economy of ventilation were analyzed, obtained separate ventilation tunnel and pipe joint can greatly reduce the project cost, with better economy. This ventilation mode can be popularized in similar projects.This thesis expatiate on the basic theory of tunnel ventilation, utilizing CFD numerical simulation relied on engineering instance, and verifying the data by spot measurement, educing the result in the end. Compared the economy of this ventilation mode with traditional duct ventilation so that to cut the engineering expense.With the tunnel larger and larger, and assistant adits more and more, this ventilation mode can prolong the distance of first independence press-in tunnel ventilation effectively. Using jet fans to deliver air in inclined shaft, as to right hole, utilizing first independence press-in tunnel ventilaton, this ventilation mode can overcome the difficult of ventilation result from assistant adits. This ventilation mode pioneers the method of long and large tunnel construction and ventilation in the future.