Table 2 Basic construction parameters of shield tunnel cases.
Cases | Diameter of the cutter head (m) | Cover depth (m) | The type of shield machine | Geological conditions | Distance of inclinometer tube from tunnel edge (m) | Minimum monitoring interval distance (m) |
|---|---|---|---|---|---|---|
Study case | 11.71 | 20.4–23.4 | Slurry shield | Sludge, silty clay, sandy clay and completely decomposed granite | 2.1–16 | 2 |
Case A | 14.93 | 25 | Slurry shield | Silty clay | 2.5–15 | 7 |
Case B | 11.58 | 30.5 | Slurry shield | Sandy clay and silty clay | 6.0–12.0 | ≈ 4 |
Case C | 6.34 | 12.1 ~ 19.2 | EPB | Sandy silt and silty clay | 1.0–13.7 | ≈ 7 |
Case D | 6.34 | 16.6 | EPB | Muddy clay and silty clay | 3.1–9.3 | ≈ 6 |
Case E1 | 6.28 | 16.4 | Slurry shield | Sandy clay, lime sand, clay | 1.3–2.5 | ≈ 7 |
Case E2 | 6.28 | 13.6 | EPB | Reddish brown sludge, clay and pebbles | 1.5 | ≈ 7 |
Case F | 6.26 | 29.3 | EPB | Moderately to slightly weathered argillaceous siltstone | 2.8–16.8 | ≈ 5 |
