• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
  • Scopus
  • Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
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TAO Liangliang, ZENG Yanhua, ZHOU Xiaohan, TIAN Xiaoyu. Effect of Mechanical Ventilation and Ground Temperature on Anti-Freezing Length of Tunnels in Cold Regions[J]. Journal of Southwest Jiaotong University, 2024, 59(1): 29-38. doi: 10.3969/j.issn.0258-2724.20211002
Citation: TAO Liangliang, ZENG Yanhua, ZHOU Xiaohan, TIAN Xiaoyu. Effect of Mechanical Ventilation and Ground Temperature on Anti-Freezing Length of Tunnels in Cold Regions[J]. Journal of Southwest Jiaotong University, 2024, 59(1): 29-38. doi: 10.3969/j.issn.0258-2724.20211002

Effect of Mechanical Ventilation and Ground Temperature on Anti-Freezing Length of Tunnels in Cold Regions

doi: 10.3969/j.issn.0258-2724.20211002
  • Received Date: 14 Dec 2021
  • Rev Recd Date: 19 Apr 2022
  • Available Online: 11 May 2023
  • Publish Date: 01 Dec 2022
  • In order to reveal the effect of ventilation parameters and ground temperature on freezing damage in tunnels in cold regions, the three-dimensional unsteady numerical heat transfer control equations for the tunnel surrounding rock, lining, and airflow are developed based on heat transfer theory. The numerical heat transfer difference equations of different nodes are analyzed, and a three-dimensional temperature field numerical calculation model is established for tunnels in cold regions with high ground temperatures. The effect of mechanical ventilation velocity, mechanical ventilation time, and ground temperature on the anti-freezing length of tunnels in cold regions with high ground temperatures is studied based on numerical analysis. The results show that 1) without considering mechanical ventilation, the anti-freezing length of Zilashan tunnel will exceed 1 200 m and decrease by about 100 m when the ground temperature increases by every 5 ℃. 2) By considering the effect of mechanical ventilation, when the ground temperature is 10–30 ℃, ventilation at a speed of 2.5 m/s for 2.0 h per day can reduce the anti-freezing length by 215 m; the anti-freezing length decreases by about 20 m as mechanical ventilation velocity increases every 0.5 m/s under different ground temperatures, and the effect of ground temperature on the decay rate of anti-freezing length is slight; when the mechanical ventilation time is less than 2.0 h, increasing mechanical ventilation velocity under different ground temperature conditions has little effect on anti-freezing length.

     

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