Research Article
Study on Numerical Simulation of Surrounding Rock Structure Safety of Urban Underwater Shield Tunnel: A Case in Chongqing
Table 1
The physical and mechanical parameters of soil mass in each layer.
| | Lithology types | Thickness (m) | Unit weight (kN/m3) | Porosity | Permeability coefficient (m2/Pa-sec) | Elasticity modulus (MPa) | Cohesion (kPa) | Internal friction angle (°) | Poisson’s ratio |
| | Siltstone | 3.1 | 20.0 | 0.386 | 4.7 × 10−9 | 12.0 | 6.8 | 35.8 | 0.25 | | Clayey silt | 7.1 | 19.7 | 0.418 | 4.7 × 10−10 | 9.3 | 10.9 | 17.9 | 0.31 | | Silty clay | 2.2 | 19.3 | 0.456 | 8.3 × 10−11 | 11.5 | 22.2 | 10.7 | 0.34 | | Siltstone | 8.7 | 20.0 | 0.386 | 4.7 × 10−9 | 12.0 | 6.8 | 35.8 | 0.25 | | Medium sandstone | 10.5 | 20.4 | 0.363 | 1.4 × 10−8 | 10.0 | 8.5 | 35.9 | 0.29 | | Clayey silt | 6.7 | 19.8 | 0.418 | 5.9 × 10−10 | 7.6 | 11.6 | 14.7 | 0.30 | | Medium sandstone | 7.7 | 20.4 | 0.319 | 7.3 × 10−9 | 10.1 | 13.6 | 32.6 | 0.28 |
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