摘要：Tunnel side ditches in the high-latitude cold regions of China experience severe freezing-induced damage. In this paper, a three-dimensional transient temperature calculation model for tunnel in cold area is proposed, and the reliability of the temperature calculation model is verified by the field test results. The characteristics of tunnel temperature distribution under the influence of many factors, especially tunnel section and tunnel length, which are ignored in the existing research, are studied. The influence of tunnel design parameters on temperature field under different railway tunnel types (single-track and double-track tunnel) was also studied. The results show that the length with a temperature below 0 °C of single-track tunnel increases with the increase of tunnel length, while that of double-track tunnel decreases. No matter what type of tunnel, increasing the train frequency and train speed can significantly increase the freezing range of the tunnel. However, the influence of piston wind on temperature distribution in single-track tunnel and double-track tunnel is very different. For single-track tunnel, the growth rate of the length with a temperature below 0 °C decreases with the increase of train speed; However, for double-track tunnel, the growth rate of the length with a temperature below 0 °C increases with train speed. The frost damage of double-track tunnel in cold area is more serious than that of single-track tunnel. Under the same conditions, the antifreezing length of double-track tunnel is much longer than that of single-track tunnel. Based on the calculation results, a prediction model for the freezing length of cold-region tunnel side ditches was proposed, thereby providing a reference for the prevention and control of freezing-induced damage in the side ditches of cold-region tunnels.
关键词：Cold-region tunnel Conduction-convection Piston wind Side ditch temperature Artificial neural network
