Research on Stratum Identification Method Based on TBM Tunneling Characteristic Parameters

Table 3

Stratum section combination and corresponding stratum code.

Stratum section combination	Stratum code
Residual soil, fully weathered granite, residual soil, and fully weathered granite	1
Fully weathered granite and strongly weathered granite	2
Strongly weathered granite	3
Strongly weathered granite and moderately weathered granite	4
Boulder	5