Wall temperature distribution in tunnel drainage ditches in cold regions and prediction methods for freezing sections
To more effectively prevent and control freezing damage in tunnel drainage ditches located in cold regions,temperature measurements were conducted in the Hufengling Tunnel and Zhishan Tunnel using a temperature recorder.This allowed for the determination of the longitudinal temperature distribution within both tunnels.A numerical simulation model of the temperature field in the drainage ditch was developed using ANSYS numerical simulation software.This model facilitated the analysis of the temperature distribution on the wall surface of the drainage ditch.Based on the temperature field within the tunnel and the freezing conditions of the drainage ditch,a prediction method for identifying freezing sections of the drainage ditch has been proposed.The results indicate that both the tunnel heat preservation side ditch and the heat preservation center drainage ditch are susceptible to freezing.Moreover,the freezing issues related to the heat preservation side ditch should be prioritized in frost protection strategies for tunnels in cold regions.The impact of short-term temperature fluctuations on the temperature field of the drainage ditch diminishes with increasing depth,ultimately exerting no influence on the temperature at the bottom of the tunnel drainage ditch.In extremely low-temperature conditions,both the Hufengling Tunnel and Zhishan Tunnel may experience freezing throughout their entire length within the heat preservation side ditch.The heat preservation center ditch within 1 000 m to 3 000 m from the entrance of the Hufengling Tunnel is particularly susceptible to freezing.Additionally,a higher flow rate in the drainage ditch correlates with a shorter freezing section,and the length of freezing is influenced by seasonal variations.Under identical temperature conditions in the tunnel,the length of the freezing section during the cooling season is shorter than that in the heating season.Based on the prediction results,measures can be taken to protect the more susceptible areas in advance,thereby preventing freezing.
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