Abstract: The Jiudianxia water conservancy project is located in the high altitude and cold area. Its dis⁃ charge tunnel on the left bank is easy to freeze due to the low temperature and the wind through tunnel. The durability of lining concrete in the tunnel is seriously damaged by the freeze-thaw cycle, which af⁃ fects the service life of the tunnel. This paper puts forward a design scheme of installing flat insulation gate at the opening of underground tunnel to solve the problems of seepage water freezing and cyclic freeze-thaw damage to the lining concrete.

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摘要： 九甸峡水利枢纽地处高寒高海拔阴湿地带，左岸溢洪洞受低温和洞内穿堂风的影响，洞内极易结冰，冻融 循环严重损伤洞内衬砌混凝土的耐久性，影响溢洪洞服役寿命。本研究提出了一种在地下式隧洞孔口安装平铺 保温门的设计方案，以解决溢洪洞内渗水结冰及循环冻融损坏衬砌混凝土的问题。

关键词: 溢洪洞, 高寒, 保温门