Abstract

The subcool zone length is determined in lining of an extra-long railway tunnel subjected to deep influence of piston effect. The air temperature distribution in the outer air–tunnel lining contact zone is determined as function of the velocity of train and the outdoor temperature in the cold season. The authors review the de-icing methods of tunnel lining: warming-up using a self-tuning heating cable; arrangement of an unheated access gallery and heat insulation. The distribution of the hourly average air temperature in an extra-long railway tunnel is analyzed against of sites of fan heaters. The heat power patterns in the tunnel are estimated by the criterion of the required temperature conditions. It is shown that the most efficient arrangement of fan heaters to maintain the required air temperature in the tunnel is their uniform distribution along the length of the tunnel in combination with installation of warm air curtains at the tunnel faces.

中文翻译：

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冷季特长铁路隧道热工况分析

摘要

过冷带长度是在受活塞效应影响较大的铁路特长隧道衬砌中确定的。外部空气-隧道衬砌接触区的气温分布由列车速度和寒冷季节室外温度的函数确定。作者回顾了隧道衬砌的除冰方法：使用自调谐加热电缆预热；布置不加热的通道和隔热。分析了某特长铁路隧道每小时平均气温的分布情况。隧道内的热功率模式是通过所需温度条件的标准来估计的。