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高海拔寒冷地区的公路隧道普遍面临着冻害威胁,极易产生衬砌开裂、边墙挂冰、路面结冰等严重影响隧道正常使用和隧道结构安全的病害现象,水是寒区隧道冻害产生的根源,高海拔寒冷地区排水系统是隧道建设、正常使用及安全运营过程中的关键环节。本文针对寒冷地区复杂隧道———既穿越多年冻土区又穿越非冻土区,分析了洞口浅埋季节冻土段、多年冻土段和非冻土段排水系统失效的原因,并给出了相应的解决措施,为高海拔寒区隧道的设计提供了参考。
Road tunnels in cold regions of high altitude generally face the threat of frost damage, which can easily lead to the occurrence of diseases such as lining cracking, wall hanging ice and road freezing, which seriously affect the normal use of the tunnel and the safety of the tunnel structure. Water is the root cause of cold damage in tunnels in cold regions Drainage systems in high altitude and cold areas are the key links in tunnel construction, normal use and safe operation. In this paper, aiming at the complicated tunnels in cold area, which traversed both permafrost regions and non-permafrost regions, the reasons for failure of drainage system in permafrost section and permafrost section were analyzed. The corresponding measures are taken to provide a reference for the design of high altitude and cold area tunnels.