Evaluation of the Adaptability of an EPB TBM to Tunnelling through Highly Variable Composite Strata

Table 3

Adaptability classification for the evaluation targets.

Grade	Description of adaptability	Degree of adaptability
I	Completely adaptable	≥0.9
II	Adaptable	0.6–0.9
III	Slightly adaptable	0.4–0.6
IV	Inadaptable	0.1–0.4
V	Completely inadaptable	≤0.1