特长铁路隧道全年运行热环境模拟分析

he heat transfer model of air and surrounding soil in the extra long railway tunnel is established and discretized by the infinite volume method. The discrete mathematical model is simulated by a self-developed program based on the simulation software of Matlab. The annual simulation results of the tunnel heat transfer indicated that the tunnel air temperature depended on the outdoor air temperature, the train running condition and the surrounding soil heat transfer. The temperature variation tendency of the tunnel air is in accord with the change trend of the outdoor air temperature, while there is a time lag. The time lag is created due to the heat charge and discharge characteristic of the surrounding soil because the surrounding soil can heat or cool the tunnel air.