Figure 8

Tunnel collapse risk assessment results after 1000 iterations under different deviation levels at four section: (a) No.1; (b) No.2; (c) No.3; (d) No.8.
Tunnel collapse risk assessment results after 1000 iterations under different deviation levels at four section: (a) No.1; (b) No.2; (c) No.3; (d) No.8.