Research Article
Risk Assessment System Based on Fuzzy Composite Evaluation and a Backpropagation Neural Network for a Shield Tunnel Crossing under a River
Table 3
Material parameters for model.
| | Item | Thickness (m) | Density (kg/m3) | Compression modulus (MPa) | Elasticity modulus (MPa) | Poisson’s ratio | Cohesion (kPa) | Friction angle (°) |
| | Surface | 5 | 1910 | 4.5 | — | 0.35 | 15 | 11 | | River bed | 5 | 1750 | 3.0 | — | 0.43 | 12.5 | 12 | | Stratum 1 | 25 | 2010 | 7.0 | — | 0.35 | 15 | 18 | | Stratum 2 | 15 | 2150 | 40 | — | 0.17 | 3.5 | 40 | | Segment | 0.35 | 2500 | — | 34500 | 0.20 | — | — |
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