Study on the Application of the Kent Index Method on the Risk Assessment of Disastrous Accidents in Subway Engineering

Table 4

Basic introduction of the tunnel.

Tunnel mileage	K11 + 251–K14 + 857
Tunnel design	Single tunnel, double track
Tunnel diameter (outer/inner)	11.2/10.2
Tunnel buried depth	5 m to 35 m
Shield type	Slurry shield
Stratum	silt layer, fine sand; 4-4e1 round gravel layer
Depth of river	0 m to 25.5 m
Permeability coefficient	5.43 × 10^−7 to 8.87 × 10^−4 cm · s