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Discussion of anti-freeze and frost resistance of shallow buried tunnels in high latitude cold region

ZHOU Xiaohan;ZENG Yanhua;YANG Zongxian;YANG Changxian;FANG Wei;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University;The Third Railway Survey and Design Institute;  
Study of freezing injury forming mechanism in shallow buried tunnel in high latitude cold region is lacked.The temperature field of cold region tunnel was measured locally.The freezing injury forming mechanism and antifreeze and frost resistance of shallow buried tunnel in high latitude cold region were discussed.The observations show that the shallow buried tunnel in high latitude region can't keep out of freezing injury using traditional heat preservation measures.The waterproof and drainage measures are the main anti-freezing methods of shallow buried tunnel in high latitude cold region.Full-length deep center ditches,sub-drains and side insulation ditches are advised to be used,with the diameter of above 80 cm of the deep center ditches.Pipe jacking method is advised to construct the center deeply buried ditches.The proper anti-freezing measures of the water outlet port should be chosen according to the terrain of the tunnel portal.
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