Study on measured wall temperature characteristics of underground railway interval tunnels

Selects five lines of Guangzhou underground railways with different operating years for the tunnel wall temperature test. The results show that the wall temperature rises along with the direction of train travel in the interval tunnel, and the temperature at the end of the interval tunnel is the highest. There is a certain correlation between the tunnel wall temperature and the outdoor temperature, but it has hysteresis influenced by the outdoor temperature. When the driving plan reaches the long-term plan, the hottest monthly average temperature in the tunnel is about 4 ℃ higher than that of the initial line. The number of train running pairs is the main reason affecting the temperature increase of the tunnel. After the driving plan reaches the long-term working condition, the tunnel temperature tends to be stable. If the number of train running pairs is stable, the tunnel temperature will no longer increase with the operating years.