Study on the Intelligent Evaluation System of Tunnel Frost Damage in Cold Regions Based on the Fuzzy Comprehensive Evaluation Model

Table 1

Classification of tunnel frost damage in cold regions.

Frost damage classification	Judgment basis	Average temperature in the coldest month/°C
I	Icing at the portal section, leakage and icing of the partial lining surface, slight frost damage, no impact on traffic	−5∼−10
II	Moderate serious icing at the portal section, moderate severe leakage and freezing damage of the lining surface, affecting traffic	−10∼−15
III	Relatively serious icing at the portal section, relatively severe leakage and freezing damage of the lining surface, serious impact on traffic	−15∼−25
IV	Serious crack of the lining surface, serious ice hanging in the tunnel, ice plug of the drain system, traffic disruption	<−25