Research Article
Measurement and Analysis of Deformation of Underlying Tunnel Induced by Foundation Pit Excavation
Table 1
Values of design parameters for each formation.
| | Formation | Layer thickness
(m) | Natural gravity
(kN/m3) | Compression modulus
(MPa) | Cohesion
(kPa) | Internal friction angle
(°) | Average thickness (m) |
| | Artificial fill | 3.2 | 18.8 | 2.5 | 10 | 10 | 2 | | Silty clay | 3.6 | 19.8 | 8 | 30 | 20 | 3 | | Coarse sand | 1.1 | 20.5 | 25 | 4 | 32 | 6 | | Round gravel | 2.8 | 21.0 | 35 | 3 | 35 | 2 | | Pebble | 2.1 | 21.0 | 40 | 1 | 40 | 7 | | Strongly weathered argillaceous siltstone | 8.1 | 23.1 | – | – | – | 13 | | Moderately weathered argillaceous siltstone | 3.6 | 24.1 | – | – | – | – |
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