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

Table 9

Value of influencing factors of frost damage in the portal section.

Influencing factors of frost damage	Measured value
Temperature outside the tunnel/°C	−12.8
Ground temperature of the surrounding rock/°C	7.0
Driving density/(pairs/h)	3.0
Wind speed in the tunnel/(m/s)	1.8
Void area length of the surrounding rock between lining/m	4.2
Annual precipitation/mm	392.8
Blockage rate of the drain pipe	0.1
Waterproof design of three seams	0.85
Buried depth/m	50
Fracture rate of the surrounding rock	1.5
Lining strength	0.8
Dissolution and invasion of the surrounding rock	0.3
Design issues	0.8
Construction issues	0.8
Operation and maintenance problems	0.9
Remedial measures	0.9