高海拔寒区铁路隧道保温排水技术研究

Study on Thermal Insulation and Drainage Technology of Railway Tunnels in High-altitude Cold Regions

针对处于高海拔寒区的川藏铁路隧道的保温排水问题,本文总结了国内多行业的寒区分类以及国内外寒区隧道保温排水技术现状,通过调研高纬度寒区铁路隧道的冻害情况,分析了高纬度寒区铁路隧道按最冷月平均气温和年平均气温的设计分区方法。结合川藏铁路工程特点,提出了川藏铁路高海拔寒区隧道设计分区和保温排水设施的设防标准建议,同时分析了各类保温排水设施的适用条件。结果表明:(1)川藏铁路高海拔寒区隧道按年平均气温和最冷月平均气温可划分为3个设计分区;(2)高海拔寒区隧道洞口段的排水沟槽设计,可结合工点特点,按设计分区采用不同的保温长度和不同的结构形式;(3)保温排水沟的检查井及出水口宜采取保温措施。

A discussion on thermal insulation and drainage technology of Sichuan-Tibet railway tunnel in the high-altitude cold region is given in this paper.This paper summarizes the classification of cold region in China and the current status of thermal insulation and drainage technology of tunnels in cold region in China and overseas.Based on investigation of the freeing damage of the railway tunnel in high-latitude cold regions,the design method of dividing railway tunnel in the high-latitude cold region according to the mean temperature of the coldest month and the mean temperature of the year is analyzed.Combined with the characteristics of the Sichuan-Tibet railway project,this paper puts forward some suggestions on the design zoning and the standard of the insulation and drainage facilities of the tunnel in the cold area,and analyzes the applicable conditions of various insulation and drainage facilities.The results show that(1)tunnel in high-altitude cold region of Sichuan-Tibet railway can be divided into 3 design zones according to the annual average temperature and the coldest monthly average temperature;(2)The design of drainage trench for tunnel entrance section in the high-altitude cold area can adopt different insulation length and different structural forms combined with the characteristics of the work site according to the design partition;(3)The thermal insulation measures should be taken at inspection wells and the outlets of drainage system.