Table 2.
Statistical table for the layout of dewatering wells in foundation pit.
| Position | Well type | Soil layers | Depth | Quantity | Aperture/well diameter/well pipe thickness | Well No | Thickness of clay ball (m) |
|---|---|---|---|---|---|---|---|
| In pit | Dewatering well | ① ~ ⑤3 | 38 | 12 | 650/273/4 mm | 4 J-1 to 4 J-12 | 0 |
| Depressurization well | ⑦ ~ ⑧21 | 68 | 1 | 650/273/6 mm | 4Y7-1 | 8 | |
| Depressurization well | 63 | 1 | 650/273/6 mm | 4Y7-2 | 8 | ||
| Observation well | 60 | 1 | 650/273/6 mm | 4G7-1 | 8 | ||
| Observation well | 70 | 1 | 650/273/6 mm | 4G8-1 | 8 | ||
| Depressurization well | ⑧22 ~ ⑨ | 85 | 3 | 850/400/8 mm | 4Y9-1 to 4Y9-3 | 10 | |
| Spare well | 85 | 1 | 850/400/8 mm | 4YB9-1 | |||
| Observation well | 85 | 1 | 850/400/8 mm | 4G9-1 | |||
| Between two walls | Spare and observation well | ⑤2 | 30 | 4 | 650/273/4 mm | 4JG52-1 to 4JG52-4 | 0 |
| Spare and observation well | ⑦ | 63 | 4 | 650/273/6 mm | 4JG7-1 to 4JG7-4 | 8 | |
| Out pit | Observation well | ⑦ | 60 | 4 | 650/273/6 mm | 4WG7-1 to 4WG7-4 | 8 |
| Observation well | ⑧21 | 70 | 2 | 650/273/6 mm | 4WG8-1 to 4WG8-2 | 8 | |
| Observation well | ⑧22 ~ ⑨ | 90 | 1 | 850/325/6 mm | 4WG9-1 | 8 |