Review Article
Multiple Disturbances of Existing Tunnels Caused by Deep Excavation and New Shield Tunnel
Table 1
Physical and mechanical parameters of soil.
| Strata sequence | Soil | Natural unit weight, | Cohesion, (kPa) | Angle of friction, (°) | Soil thickness (m) |
| 1-1 | Miscellaneous fill | 17.5 | 8 | 15 | 3.1 | 3-2 | Sandy silt | 19.5 | 6 | 29 | 1.4 | 3-3 | Powder sand | 19.3 | 5 | 33 | 7.0 | 3-5 | Silty sandy silt | 19.2 | 5 | 33 | 4.0 | 3-7 | Sandy silt | 19.6 | 6 | 28 | 3.4 | 6-2 | Muddy silty clay | 19.2 | 25 | 15 | 1.7 | 7-2 | Silty clay | 19.1 | 28 | 18 | 2.6 | 8-1 | Clay | 19 | 25 | 19 | 4.8 | 8-2 | Silty clay | 18.8 | 20 | 20 | 2.5 |
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