Study on Identification of Construction Method for Ultra-Large-Span Tunnel

Table 8

Quantitative index value of tunnel stability under different factor levels.

Level of factor	Quantitative index value of tunnel stability F
	Tunnel span A	Rock strength B	Coefficient of rock integrity C
I	20	6	9
II	17	12	12
III	16	18	17
IV	13	20	20
V	13	23	21
Range	7	17	12