Research Article
Dynamic Response Characteristics of the Structures under Excavation by High-Efficiency Blasting in the Urban Ultradeep Foundation Pit
| Position | Bench height (m) | Hole spacing (m) | Row spacing (m) | Overdrilling depth (m) | Borehole diameter (mm) | Length of stemming (m) | Single-hole charge (kg) |
| Distance from supporting pile | >20 m | 4.0 | 3.0 | 2.5 | 0.5 | 90 | 2.9 | 8 | 15–20 m | 3.5 | 3.0 | 2.5 | 0.5 | 90 | 2.8 | 6 |
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