Research Article
Study of the Construction Sequence of Overlapping Tunnels by the Shield Tunneling Method: A Case Study of the Longest Overlapping Tunnel in China
Table 1
Soil mechanics parameters.
| | The soil classification | Thickness h (m) | Unit weight γ (kN/m3) | Cohesion C (kPa) | Internal friction angle φ (°) | Compressive modulus Es (MPa) | Poisson’s ratio |
| | Plain fill | 1 | 19 | 8 | 12 | 4.2 | 0.35 | | Silty clay ⑥1 | 8 | 19.6 | 18.4 | 24.1 | 5.6 | 0.35 | | Silty clay ⑥4 | 5 | 19.4 | 18.2 | 23.9 | 6.5 | 0.3 | | Silty clay ⑧1 | 6 | 20.4 | 21.5 | 19 | 5.5 | 0.3 | | Sandy silt ⑧2 | 3 | 21.5 | 4.6 | 36.2 | 14.4 | 0.3 | | Silty clay ⑨1 | 4 | 20.4 | 21.9 | 27.1 | 7.4 | 0.3 | | Sandy silt ⑨2 | 3 | 20.3 | 8.7 | 33.9 | 13.1 | 0.3 | | Silty clay ⑩1 | 20 | 22 | 39.4 | 23 | 7.6 | 0.3 |
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