Quantitative Inversion of Water-Inrush Incidents in Mountain Tunnel beneath a Karst Pit

Table 13

Safety factors of lining structure.

Key position	Dome	Left spandrel	Right spandrel	Left arched waist	Right arched waist	Left wall	Right wall	Left arch foot	Right arch foot	Invert
Left line	1.6	1.2	0.8	1.8	0.9	1.8	1.5	2.7	1.7	1.5
Right line	2.5	2.5	5.7	1.9	5	1.8	3.2	1.8	2.9	2.8