Computational Optimization of the Insulation Parameter of Freeze-proof Separate Lining in Cold-region Tunnel

摘要

To address the issue of tunnel freezing damage, the separate lining structure was used in the cold-region tunnel. Based on the Dongnanli tunnel, the optimization study on the parameters of separate lining structure was conducted through the Finite Element Method (FEM). The results show that the insulating surface treatment method is more reasonable and effective than double lining insulation treatment method: the insulation thickness in this tunnel is recommended as 5 cm according to the equivalent thickness conversion method: the formula and the modified factor of the length of insulting layer are obtained, and the modified lengths of the insulation layer at the east entrance and west entrance of the Dongnanli tunnel are 796 m and 786 m respectively.