Research Article
Rotational Failure Mechanism for Face Stability of Circular Shield Tunnels in Frictional Soils
Figure 13
Stability charts of the critical pressure supported on the tunnel face under the pore water pressure ru = 0.3. (a) φ = 40°. (b) φ = 30°. (c) φ = 20°. (d) φ = 10°.
| (a) |
| (b) |
| (c) |
| (d) |