Research Article
Geohazard Caused by Groundwater in Urban Underground Excavation
Figure 1
The launching of a shield.
| (a) Schematic drawing of launching of a shield |
| (b) The shield in the pit |
| (c) Tunnel eye for launching |
| (d) Launching of shields |
| (a) Schematic drawing of launching of a shield |
| (b) The shield in the pit |
| (c) Tunnel eye for launching |
| (d) Launching of shields |