Research Article
The Deformation Analysis of a Deep Frame Top-Down Excavation in Downtown Shanghai Based on the 3D FEM
Table 3
State of foundation pit construction.
| Stage | Event | Date (yy/mm/dd) | Days spent |
| 0 | Construction of retaining wall, steel lattice column, and bored pile as the vertical support system and compaction grouting of the soils | 20081217 –20090914 | 272 | 1 | Excavation to 1.15 m BGS; construction of the roof beam (0.8 m × 0.65 m) and level 1 temporary RC ring struts (1.6 m × 0.8 m) | 20090915–20091110 | 57 | 2 | Excavation to 5.85 m BGS; construction of middle beam 1 (1.0 m × 0.6 m) and level 2 temporary RC ring struts (1.8 m × 0.8 m) | 20091111–20100206 | 88 | 3 | Excavation to 10.05 m BGS; construction of middle beam 2 (1.2 m × 0.6 m) and level 3 temporary RC ring struts (2.0 m × 0.8 m) | 20100301–20100705 | 127 | 4 | Excavation to 13.6 m BGS (final level) | 20100706–20100928 | 84 | 5 | Construction of the base slab | 20100928–20101126 | 58 | 6 | Construction of the podium block | 20100903–20110227 | 177 | 7 | Construction of the tower block | 20101205–20110531 | 178 |
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