Influence of Ventilation Parameters on Gas Transportation Patterns in Long Highway Tunnels and Sustainable Development of Ventilation Systems

Liang Suo (), Shugang Li and Fengliang Wu
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Liang Suo: School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Shugang Li: School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Fengliang Wu: School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China

Sustainability, 2025, vol. 17, issue 3, 1-23

Abstract: In order to study the influence of ventilation parameters on gas movement in large sections of highway tunnels, a mathematical model of gas movement in tunnels is established based on the Yijin Expressway’s Kahaluo No. 1 three-lane tunnel project in Sichuan Province, by using Fluent numerical simulation software to simulate gas tunnel construction. The space–time distribution characteristics of the gas concentration in tunnel construction are obtained, and the influence of ventilation parameters on gas movement is analyzed, the ventilation parameters of the tunnel construction site were optimized. The results show that after ventilation for 20 min, the flow field in the tunnel gradually developed and stabilized, and the gas concentration developing area finally extended to the 45 m position behind the working face, and the gas in the 9 m area behind the face mainly accumulated at the different side of the arched feet of the air duct. Ultimately, the internal flow field structure of the tunnel is mainly composed of a vortex zone (within 10 m in front of the tunnel), a development zone (10–50 m in front of the tunnel), and a stable zone (50–200 m in front of the tunnel). Under the background of the project, the optimal ventilation parameters are as follows: wind velocity 12 m/s, duct diameter 2.0 m, distance from outlet to working face 8 m, and distance from outlet to secondary lining trolley 24 m. According to the optimal ventilation parameter combination, the ventilation system of Cahalo No. 1 tunnel was optimized. It was found that the gas concentration in the tunnel decreased obviously with the increase in ventilation time. The above research further improves the gas tunnel ventilation study, which is of great significance in guiding the site to optimize the ventilation system and guaranteeing the sustainable development of the tunnel ventilation system.

Keywords: large section; highway tunnels; ventilation parameters; gas transport; orthogonal test; numerical simulation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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