铁道科学与工程学报2016，Vol.13Issue(8)：1569-1577,9.
寒区隧道合理保温型式及保温效果试验
Rationality of heat preservation mode in cold region tunnels and model test verification
摘要
Abstract
Cold region tunnels are often destroyed by freeze-thaw cycles,setting appropriate thermal insulation layer can effectively reduce the occurrency of tunnel freezing injury.According to the principle of frozen soil,and the stephen formula,the maximum freezing depth of surrounding rock was calculated.Combining with the equiva-lent thickness conversion method,the calculation formula of the thickness of insulation layer was deduced.Based on the engineering example,calculated thickness of built-in thermal insulation layer is 3.23cm.Using the inde-pendent Indoor model testing 3 groups working condition of experiment,the environment temperature is-1 2.5 ℃no thermal insulation layer,-1 2.5 ℃built-in 3.5 cm polyurethane thermal insulation layer,and 20℃built-in 3.5cm polyurethane thermal insulation layer,verifying the theoretical calculation value.The results show that the environment temperature is -1 2.5 ℃ surrounding rock frozen without thermal insulation layer,built-in 3.5 cm polyurethane insulation heat preservation effect is good;When the environment temperature -20 ℃built-in 3.5 cm polyurethane insulation heat preservation effect variation but can still meet the short-term surrounding rock not freeze.The results can provide evidence for design of cold region tunnels.关键词
寒区隧道/冻结深度/保温型式/等效厚度换算法/模型试验Key words
cold region tunnels/frozen depth/heat preservation mode/the equivalent thickness conversion method/model test分类
交通工程引用本文复制引用
张玉伟,谢永利,李又云,赵飞舟..寒区隧道合理保温型式及保温效果试验[J].铁道科学与工程学报,2016,13(8):1569-1577,9.基金项目
西部交通建设科技项目（2011318797600）；交通运输部应用基础研究项目（2015319812140）；四川省交通厅科技项目 （）
