Table 10 Properties of the soils at the test sections
From: Use of a 10.22 m diameter EPB shield: a case study in Beijing subway construction
Name | Natural density (g/cm3) | Dry density (g/cm3) | Porosity | Liquid limit (%) | Plastic limit (%) | SPT N-values |
|---|---|---|---|---|---|---|
Backfill ① | 1.65 | – | – | – | – | – |
Silt ③ | 2.02 | 1.67 | 0.369 | 26.3 | 19.2 | – |
Silty clay ③1 | 1.90 | 1.46 | 0.463 | 36.9 | 24.3 | – |
Fine sand ④3 | 2.02 | – | – | – | – | 31 |
Silty clay ⑥ | 2.03 | 1.66 | 0.389 | 31.8 | 19.6 | – |
Silty clay ⑥1 | 1.89 | 1.43 | 0.476 | 40.9 | 24.9 | – |
Silt ⑥2 | 2.08 | 1.76 | 0.349 | 26.1 | 17.6 | – |
Medium sand ⑦1 | 2.10 | – | – | – | – | 53 |
Fine sand ⑦2 | 2.05 | – | – | – | – | 44 |