Research Article
Site Measurement and Study of Vertical Freezing Wall Temperatures of a Large-Diameter Shield Tunnel
Table 1
Physical-mechanical parameters of soil horizons at shield launching spot.
| | Soil name | Unit weight γ (kN/m3) | In-situ water content (%) | Liquid limit (%) | Plastic limit (%) | Poisson's ratio | Elastic modulus (MPa) | Cohesion (kPa) | Angle of friction (degree) | Coefficient of permeability (m/s) |
| | ①-2 element fill stratum | 16.5 | 52.3 | 43.5 | 24.6 | 0.36 | 7.0 | 26.0 | 7.9 | 5 × 10−9 | | ②-1a2-3 clay layer | 18.1 | 40.6 | 44.1 | 22.9 | 0.30 | 7.9 | 18.0 | 13.2 | 5 × 10−10 | | ②-2b4 muddy-silty clay layer | 16.7 | 30.3 | 35.3 | 20.4 | 0.32 | 6.2 | 18.0 | 15.3 | 5 × 10−9 | | ②-3d3-4 silt sand layer | 18.8 | 16.8 | — | — | 0.26 | 20.0 | 8.0 | 31.5 | 9 × 10−6 | | ②-5d1 silt sand layer | 19.4 | 22.1 | — | — | 0.26 | 24.2 | 6.0 | 27.3 | 2 × 10−5 |
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