Research Article
Numerical Study on the Disturbance Effect of Short-Distance Parallel Shield Tunnelling Undercrossing Existing Tunnels
Table 4
Strength-weakening scheme of soil layer.
| | Stratum name | Thickness (m) | Soil mass (kN m3) | Cohesion (kPa) | Internal friction angle (°) | Deformation modulus (MPa) | Poisson’s ratio | Permeability coefficient (cm/s) | Porosity |
| | Miscellaneous fill① | 5 | 16.9 | 8 | 9 | 5 | 0.35 | 8.0 × 10−4 | 0.64 | | Miscellaneous fill① | 5 | 16.9 | 8 | 9 | 5 | 0.35 | 8.0 × 10−4 | 0.64 | | Miscellaneous fill① | 5 | 16.9 | 8 | 9 | 5 | 0.35 | 8.0 × 10−4 | 0.64 | | Alluvium clay④ | 10 | 19.7 | 51.5 | 13 | 300 | 0.22 | 1.5 × 10−7 | 0.43 |
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