寒区隧道冻害等级及其设防等级研究

Study on Freezing Damage and Prevention Classification of Tunnel in Cold Region

针对寒区隧道冻害等级及其设防等级进行研究。首先将寒区隧道分成5类,并对每一类自身特性进行详细阐述;然后,从4个方面对寒区隧道冻害等级进行划分,分别为衬砌冻胀力作用等级、洞内结冰影响正常使用等级、混凝土结构冻融环境下的结构耐久性和混凝土冻害疲劳强度;最后,基于以上冻害等级对冻害设防等级进行划分。提出了寒区隧道的选线指导原则、冻害等级及冻害设防等级划分、冻害设防措施建议。

The freezing damage and prevention classification of tunnel in cold region were studied in this paper.First,the tunnels in cold region were divided into five classes,and each characteristic of them was described in detail.Then,the freezing-damage classifications of tunnel in cold region were divided from four aspects,which were the classification of the frost-heaving forces of the lining,the classification of icing up which may affect the serviceability inside the tunnel,the concrete structure durability under freeze-thaw environment,and the fatigue strength of concrete under freezing-damage.Finally,the prevention classifications were divided based on the freezing-damage classifications.The main results were that,the guiding principles of tunnel route selection,freezing-damage classification,the prevention classification and the corresponding measures were proposed.