Research Article
Upper Bound Solution of Safety Factor for Shallow Tunnels Face Using a Nonlinear Failure Criterion and Shear Strength Reduction Technique
Table 1
Comparison of FOS for tunnel face.
| | Number | | γ (kN/m3) | () | (Pa) | FOS | | LEM | LAM |
| | 1 | 0.4 | 20 | 20 | 24960 | 1.0442354 | 1.0085697 | | 2 | 0.4 | 20 | 25 | 18120 | 1.0395553 | 1.0189546 | | 3 | 0.4 | 20 | 30 | 12960 | 1.0307114 | 1.0094596 | | 4 | 0.4 | 20 | 35 | 10560 | 1.031479 | 1.0074599 | | 5 | 0.4 | 20 | 40 | 7920 | 1.0314455 | 1.0098653 | | 6 | 0.4 | 20 | 45 | 6000 | 1.0327247 | 1.0112345 |
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