Research Article
A Closed-Form Solution for the Analysis of Antifreeze Disease Fortification Length in a Permafrost Tunnel
Table 3
Relevant parameters of the Fenghuoshan tunnel.
| Related parameters | Parameter value |
| Heat transfer coefficient of the surrounding rock (m·°C) | 1.650 | Heat capacity of the surrounding rock (J/m3·°C) | 2465 | Heat transfer coefficient of the shotcrete (W/(m·°C)) | 1.655 | Heat capacity of the shotcrete (J/m3·°C) | 1.617 × 103 | Heat transfer capacity of the thermal insulation (W/(m·°C)) | 0.003 | Heat capacity of the insulation (J/m3·°C) | 0.072 × 103 | Heat transfer coefficient of the lining (W/(m·°C)) | 1.825 | Heat capacity of the lining (J/m3·°C) | 1.312 × 103 | Air speed (m/s) | 0.3 | Air heat transfer coefficient (W/(m·°C)) | 0.02 | Freezing and thawing depth around the surrounding rock (m) | 10 | Heat transfer coefficient between the air and the surrounding rock (W/(m·°C)) | 20 |
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