Research Article
Study on Deformation Law of Deep Foundation Pit with the Top-Down Method and Its Influence on Adjacent Subway Tunnel
| Soil layer number | Name of soil | Depth, H (m) | Cohesion, c (kPa) | Friction angle, φ (°) | Elastic modulus, E (MPa) | Poisson ratio, µ | Unit weight, γ (kN/m3) | SPT | Saturated uniaxial compressive strength (MPa) |
| | Fill | −1.5∼−4.2 | 18 | 11 | 5 | 0.35 | 18.6 | — | — | | Silt | −2.6∼−4.6 | 8 | 10 | 3 | 0.3 | 18.7 | 3–5 | — | | Cobble | −2∼−5.6 | — | — | 15 | 0.24 | 27 | — | — | | Silty clay | −5∼−16 | 28 | 10 | 8 | 0.33 | 19.3 | 8–10 | — | | Silty clay | −11.4∼−27.8 | 28 | 11 | 8 | 0.32 | 19.3 | 12–14 | — | | Silty clay | −15∼−34 | 30 | 13 | 8.5 | 0.33 | 19.4 | 13–14 | — | | Silty clay | −3.1∼−20 | 30 | 16 | 10 | 0.3 | 19.6 | 15–17 | — | | Silty clay | −8.3∼−27.4 | 35 | 18 | 11.5 | 0.32 | 19.5 | 16–18 | — | | Strongly weathered limestone | −16.5∼−61.5 | — | — | 90 | 0.2 | 26 | — | — | | Moderately weathered limestone | — | — | — | 500 | 0.2 | 30 | — | 93.1 |
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