Monitoring of thermal environment and soil heat storage and release characteristics of underground railway interval tunnels

 Based on the analysis of monitoring data for about 14 months of thermal ambient air temperature, wall temperature, heat flux density and other parameters of a underground railway interval in Shanghai, obtains the characteristics of the air temperature change with time and location in the underground railway interval and the heat storage and release characteristics of the interval soil. The maximum temperature difference between interval tunnel air and outdoor air is 13 ℃ in winter and 4 ℃ in summer. The soil of interval tunnel is mainly exothermic in winter, and the typical daily heat flux density ranges from -2 to 23 W/m2. The heat storage and release of the interval soil is the key to maintaining the relative stability of air temperature in the interval.

Keywords  heat flux density, air temperature, interval soil, heat storage and release, underground railway