Fiber Bragg Grating Sensors-Based In Situ Monitoring and Safety Assessment of Loess Tunnel

Table 2

Safety factors of the liner structure in each section.

Section	FBG1/FBG6	FBG2/FBG7	FBG3/FBG8	FBG4/FBG9	FBG5/FBG10
Eccentric distance (m)	0.022	0.004	0.007	0.005	0.003
Eccentric influence factor	0.996	1.000	1.000	1.000	1.000
Compressive stress (MPa)	8.594	9.227	10.807	10.042	9.161
	2.8	2.62	2.24	2.41	2.64