Research Article
Analysis of Face Stability during Excavation of Double-O-Tube Shield Tunnel
Table 2
Physical and mechanical parameters of the materials.
| | Material type | Thickness (m) | Bulk density (kN/m3) | Cohesion (kN) | Friction angle (°) | Elastic modulus (MPa) | Poisson’s ratio |
| | Sand | — | 18 | 0 | 25 | 25 | 0.34 | | Silt | — | 18 | 10 | 15 | 15 | 0.33 | | C50 reinforced concrete lining | 0.3 | 25 | — | — | 34500 | 0.17 | | Tail grouting | 0.15 | 16.5 | — | — | 1.2 | 0.2 |
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