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

Table 7

Macro form of test combination at each level of factor A.

No.	Excavation span (A)	Code of test combinations	Macro form of the test combinations
1	1	A1B1C1、A1B2C2、A1B3C3、A1B4C4、A1B5C5	A1B(5)C(5)
2	2	A2B1C2、A2B2C3、A2B3C4、A2B4C5、A2B5C1	A2B(5)C(5)
3	3	A3B1C3、A3B2C4、A3B3C5、A3B4C1、A3B5C2	A3B(5)C(5)
4	4	A4B1C4、A4B2C5、A4B3C1、A4B4C2、A4B5C3	A4B(5)C(5)
5	5	A5B1C5、A5B2C1、A5B3C2、A5B4C3、A5B5C4	A5B(5)C(5)

Note. B(5) represents the combinations of five levels of factor B and C(5) represents the combinations of five levels of factor C.