Field experiment of thermal environment at subway tunnel entrance and air shaft in cold zone

Zhang Sikai1, Gao Ran2, Yang Changqing2, Li Angui2, Du Wuyi3


In order to clarify the thermal environment changes at the tunnel entrance and air shafts in cold zone in winter, Lanzhou Metro Line 1 is selected for long-term field testing. The test results of the entrance section of the subway tunnel and the adjacent tunnel of the interval air shaft are analysed, respectively. The test result shows whether it is the tunnel entrance or the adjacent tunnel of the interval air shaft, the heat insulation should be strengthened when the train is out of service at night. When there is traffic in the tunnel, the shorter the interval time between trains, the greater the temperature rise value in the tunnel with the increase of the distance from the entrance or air shafts. The wall temperature at the tunnel entrance is mainly affected by the buried depth. When the tunnel is deeply buried, the wall temperature is relatively stable and much higher than 0 ℃. The results of this field measurement can provide data support for clarifying the law of thermal environment changes where is prone to freezing damage in the subway in cold zone.