Research Article
Numerical Study on the Disturbance Effect of Short-Distance Parallel Shield Tunnelling Undercrossing Existing Tunnels
Table 1
Physical and mechanical parameters of strata.
| | 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 fill ① | 5 | 16.9 | 8 | 9 | 5 | 0.35 | 8 × 10−4 | 0.64 | | Alluvial proluvial clay ② | 10 | 19.6 | 47.5 | 12 | 50 | 0.32 | 1.0 × 10−6 | 0.58 | | Alluvium clay (expansive soil) ③ | 25 | 19.7 | 49.5 | 14 | 200 | 0.28 | 1.2 × 10−6 | 0.52 | | Alluvium clay ④ | 10 | 19.7 | 51.5 | 13 | 300 | 0.22 | 1.5 × 10−7 | 0.43 |
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