寒冷地区地铁隧道洞口及风井处热环境实测研究

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

为明确冬季寒冷地区隧道洞口、风井处的热环境变化,选取兰州市地铁一号线进行了长期实地测试。分别对地铁隧道洞口段、区间风井相邻隧道处的测试结果进行了分析,结果显示:无论是隧道洞口或区间风井相邻隧道内,都应加强夜间列车停运时的保温;当隧道内行车时,行车间隔时间越短,隧道内温度随着与洞口或风井距离的增加上升值越大;隧道洞口段壁面温度主要受埋深影响,当隧道深埋时,受地热作用壁面温度较为稳定并远高于0℃。实测结果可为明确寒冷地区地铁易发生冻害处热环境变化规律提供数据支撑。

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.