Effects of Fire Compartmentation and Smoke Exhaust Measures on Smoke Spread Caused by Cable Fire in Utility Tunnel

Table 9

Comparison of visibility changes under working conditions 1, 2, and 3.

Working condition	Screenshot of visibility changes	Description
Working condition 1	t = 400 s	Visibility at the middle of the tunnel 16.3 m
	t = 500 s	Visibility at the middle of the tunnel 7 m
Working condition 2	t = 400 s	Visibility at the middle of the tunnel 11.4 m
	t = 500 s	Visibility at the middle of the tunnel 6.4 m
Working condition 3	t = 400 s	Visibility at the middle of the tunnel 11.2 m
	t = 500 s	Visibility at the middle of the tunnel 6 m