Table 2 Comparative analysis of plastic zone radius under different methods (m).
From: An new elastic–plastic analytical solution of circular tunnel under non-axisymmetric conditions
Internal load (MPa) | Lateral pressure coefficient | 0.5 | 1.0 | 1.5 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Methods | 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 | |
0.0 | Vault | 2.90 | 3.33 | 2.90 | 3.30 | 3.70 | 2.98 | 3.64 | 3.64 | 4.10 | 4.12 | 4.02 | 3.89 |
Spandrel | 3.70 | 4.32 | 3.76 | 3.70 | 3.70 | 2.98 | 3.64 | 3.64 | 3.70 | 4.40 | 3.59 | 3.60 | |
Side wall | 3.90 | 3.62 | 5.35 | 4.22 | 3.70 | 2.98 | 3.64 | 3.64 | 3.30 | 3.76 | 3.22 | 3.35 | |
Maximum error (%) | – | 17 | 37 | 14 | – | 19 | 2 | 2 | – | 19 | 3 | 5 | |
0.1 | Vault | 2.90 | 2.71 | 3.18 | 3.50 | 3.53 | 3.53 | 4.10 | 3.90 | 3.77 | |||
Spandrel | 3.50 | 3.57 | 3.55 | 3.50 | 3.53 | 3.53 | 3.70 | 3.51 | 3.51 | ||||
Side wall | 3.70 | 4.66 | 3.98 | 3.50 | 3.53 | 3.53 | 3.30 | 3.16 | 3.28 | ||||
Maximum error (%) | – | 26 | 10 | – | 1 | 1 | – | 5 | 8 | ||||
