A Study on Large Power Jet Ventilation Technology in Long Tunnel Construction

Abstract:

One of difficulties in super long tunnels’ construction is the construction ventilation to meet the requirement of normal construction environment and assure the workers’ health. Using traditional tunnelling ventilation is very difficult to meet the need of super long tunnel construction. As the energy assumption is high and it is very expensive. This paper investigated the simulation of tunnel construction ventilation with large power jet fans during the construction of Jinping Auxiliary Tunnels by using the computational fluid code FLUENT, the layout of jet fans in the tunnels is optimized. It is found that the best layout of the jet fan is aroud the transverse channel under the direction of airflow and jet fan should not be too far away from the transverse channel. The CO mainly distributes in the upper part of the tunnel when the jet fan is installed at a higher position, this layout of the jet fan is beneficial to construction of tunnels.

• Periodical: Applied Mechanics and Materials (Volumes 94-96)
• Pages: 1800-1804
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.94-96.1800
• Online since: September 2011
• Authors: Heng Zhang, Shou Gen Chen, Liang Chen
• Keywords: CO Concentration, Jet Fan Ventilation, Numerical Simulation

References

[1] Defang CHEN, ventilation design reviewed in long tunnel[J], Tunnel and Underground Engineering, (1995)3:34-37(in Chinese)

[2] M. A. Gaillard, Ventilation and cooling of a Long Railway Tunnel, Second International Symposium on the Aerodynamics and Ventilation of Vehicle Tunnels, (1976): E2-23--EZ-55

[3] Mengli Gao, jet ventilation and disaster prevention in tunnel[J], Journal of China Road,(1998)11:1-5(in Chinese)

[4] C.Rudin. Fires in long railway tunnels-the ventilation concepts adopted in the A1pTransit projects.10th International Symposium on the Aerodynamics Ventilation of Vehicle Tunnels, (2000)

[5] W.K. Chow, Dispersion of Carbon Monoxide from a Vehicular Tunnel with the Exit Located along a Hillside. Tunneling and Underground Space Technology.(1989),vo1.4,No2:231-234

DOI: 10.1016/0886-7798(89)90057-6

[6] Lixin Yang, airflow control of jet ventilation during the tunnel construction at the transverse channel, Tunnel Construction, (2003)5 :18-22(in Chinese)

[7] Lixin Yang,the effect of the layout of jet fan during the tunnel construction, Journal Of Railway Engineering, (2004)12 :93-97(in Chinese)

[8] Haiqiao WANG, Shiliang SHI, Ronghua LIU, Heqing LIU . Numerical simulation study on ventilation flow field of wall-attached jet in heading face[J]. Journal of China Coal, (2004)4:425-428(in Chinese)

[9] Ministry of Transportation in People's Republic of China. Specifications for Design of Ventilation and Lighting of Highway Tunnel[S]. China Communications Press.(2000) (in Chinese)