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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2020  >  20(6): 161-170
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WANG Yong-dong, HUA Si-hao, HE Zhi-wei, TAN Zhen-jie, WANG Wei, LIU Dong-xu. Mixed ventilation design system combined cross passage with single shaft in extra-long highway tunnel[J]. Journal of Traffic and Transportation Engineering, 2020, 20(6): 161-170. doi: 10.19818/j.cnki.1671-1637.2020.06.014
Citation: WANG Yong-dong, HUA Si-hao, HE Zhi-wei, TAN Zhen-jie, WANG Wei, LIU Dong-xu. Mixed ventilation design system combined cross passage with single shaft in extra-long highway tunnel[J]. Journal of Traffic and Transportation Engineering, 2020, 20(6): 161-170. doi: 10.19818/j.cnki.1671-1637.2020.06.014
shu

Mixed ventilation design system combined cross passage with single shaft in extra-long highway tunnel

doi: 10.19818/j.cnki.1671-1637.2020.06.014
  • 1.

    School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    Tianjin Municipal Engineering Design and Research Institute, Tianjin 300392, China

  • 3.

    Henan Provincial Yaoluanxi Highway Construction Co., Ltd., Luoyang 471511, Henan, China

  • 4.

    Henan Province Communications Planning and Design Institute Co., Ltd., Zhengzhou 451450, Henan, China

Funds:

National Natural Science Foundation of China 51978059

Science and Technology Project of Henan Provincial Department of Transportation 2017Z4

Construction Science and Technology Project of Ministry of Transport 2013318802400

More Information
  • Author Bio:

    WANG Yong-dong(1974-), male, associate professor, PhD, ys09@gl.gfscw.cn

  • Received Date: 2020-07-07
  • Publish Date: 2020-12-25
    Abstract
  • In order to reduce the construction and operation costs of highway tunnel ventilation systems, and solve the problem of limited applicable length for the complementary ventilation system, a complementary ventilation system was applied to the sectional longitudinal ventilation mode. A mixed ventilation mode combined air-exchange cross passage with a single shaft was proposed. Based on tunnel ventilation theory, the calculation formulas for this mode were deduced. Combined with tunnel ventilation design procedures, a design process from selecting the air shaft position, calculating the designed air volume, selecting the cross passage position, calculating the air exchange ratio of cross passage to checking the pollutant concentration was developed. The applicability of the mixed ventilation mode was then analyzed according to tunnel structure form and wind demand of left-right line tunnels. An engineering case study was conducted on the practicability of the mixed ventilation mode. The mixed ventilation mode was compared with the conventional sectional longitudinal ventilation mode in terms of the construction scale and operation energy consumption. Analysis result shows that compared with conventional sectional longitudinal ventilation mode, the proposed mixed ventilation mode adds two air-exchange cross passages and a smoke exhaust passage in terms of tunnel structure and reduces part of connection access and a ventilation shaft. Therefore, the overall scale of the structure and the preliminary construction cost are reduced, and the problem of complementary ventilation mode limited by the length of fire smoke exhaust in extra-long highway tunnels is effectively solved at the same time. In terms of operation energy consumption, when vehicle speed in the tunnel is 60 km·h-1, the mixed ventilation mode is more efficient because of the utilization of the traffic wind pressure and the reduction of the need for mechanical ventilation power in the tunnel. Although the energy consumption of jet fans increases, the energy consumption of axial fans reduces by 25.00%, and the total power reduces by 10.85%. The operation energy consumption of tunnel is effectively reduced, which brings significant economic benefits.

     

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