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Applicability Analysis of the Complementary Ventilation System in Twin-Tube Highway Tunnels
(1 Shaanxi Provincial Key Laboratory of Highway Bridge and Tunnel, Chang'an University, Xi'an 710064; 2 Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blackburg, VA24060; 3 Shaanxi Provincial Communication Construction Group, Xi'an 710075)
Abstract In order to study the applicability of the complementary ventilation system in twin-tube highway tunnels, the effects on the complementary ventilation load ratio and ventilation efficiency are investigated and analyzed in terms of the influence factors, such as altitude, temperature, tunnel length, longitudinal slope, traffic flow, traffic composition and interval between the two tubes. The results show that: the complementary ventilation system should be adopted when the ventilation load ratio between the up-line and down-line tubes is above 1.5, or the absolute value of the one-way longitudinal slope is between 1.5%~2.0%;it is the most economic and practical way to apply the complementary ventilation system in twin-tube tunnels with lengths ranging from 4.5 km to 6 km; the complementary ventilation system should be considered when the mix rate of large vehicles is between 35%~50% based on the influence relation of traffic flow and traffic composition; and the minimum interval for twin-tube tunnels using the complementary ventilation is 30 m.
Abstract：
In order to study the applicability of the complementary ventilation system in twin-tube highway tunnels, the effects on the complementary ventilation load ratio and ventilation efficiency are investigated and analyzed in terms of the influence factors, such as altitude, temperature, tunnel length, longitudinal slope, traffic flow, traffic composition and interval between the two tubes. The results show that: the complementary ventilation system should be adopted when the ventilation load ratio between the up-line and down-line tubes is above 1.5, or the absolute value of the one-way longitudinal slope is between 1.5%~2.0%;it is the most economic and practical way to apply the complementary ventilation system in twin-tube tunnels with lengths ranging from 4.5 km to 6 km; the complementary ventilation system should be considered when the mix rate of large vehicles is between 35%~50% based on the influence relation of traffic flow and traffic composition; and the minimum interval for twin-tube tunnels using the complementary ventilation is 30 m.
WANG Ya-Qiong-1,
2 ,
Jiang-Xue-Meng-3 etc
.Applicability Analysis of the Complementary Ventilation System in Twin-Tube Highway Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(3): 14-22
2015, Vol. 52 