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- Title
基于混凝土强度的高地热隧道隔热层厚度研究.
- Authors
郭利民; 段俊哲; 夏才初; 常文江
- Abstract
With the development of “ long, large and deep” tunnels, more and more high geothermal tunnels have been constructed. High geothermal heat, as one of the typical adverse geological conditions, can not only bring great inconvenience to the tunnel construction but also seriously reduce the security of the tunnel structure. Therefore, to reduce the adverse effects of high temperature on high geothermal tunnels, relevant literatures are investigated where the relationship between temperature and lining concrete strength was figured ou. Then, a numerical temperature calculation model is established with Comsol numerical simulation software based on a high geothermal tunnel in the western plateau region. The average curing temperature of lining concrete under each condition is obtained, corresponding to the concrete strength. The effect of various thermal insulation layer thickness under different conditions is studied from the perspective of protecting the strength of the lining concrete. The following conclusions are obtained: (1) The concrete curing temperature should be lower than 40℃ in the high geothermal tunnel, otherwise the strength of the lining concrete will be seriously reduced. (2) The selection scheme of the thermal insulation layer in the high geothermal environment tunnel is proposed: no thermal insulation layer is needed when the ground temperature is below 55℃; 3 cm-thick thermal insulation layer is suitable when the ground temperature is between 55℃ and 65℃; 5 cm-thick thermal insulation layer is suitable when the ground temperature is between 65℃ and 75℃; when the ground temperature is between 75℃ and 85℃, 5 cm-thick thermal insulation layer is enough if the air temperature in the tunnel can be kept within 28℃, otherwise 10 cm-thick thermal insulation layer is applied; when the ground temperature is higher than 85℃, 10 cm-thick thermal insulation layer is recommended.
- Publication
Railway Standard Design, 2024, Vol 68, Issue 4, p161
- ISSN
1004-2954
- Publication type
Article
- DOI
10.13238/j.issn.1004-2954.202208020008