Distribution Features of the Minimum Rock Cover Thickness of the Surrounding Rock Self-Stability of the Metro Tunnel in the Soil-Rock Dualistic Stratum

Table 7

Statistical table of the soft soil thickness along lines.

Soil thickness (m)	≤3 m	≤6 m	≤9 m	≤12 m	≤15 m	≤18 m
Percentage	15.6%	30.7%	45.6%	61.4%	77.5%	89.7%