Research Article
A Vibration-Isolating Blast Technique with Shock-Reflection Device for Dam Foundation Excavation in Complicated Geological Conditions
Table 7
Comparison between different dam foundation protective layer excavation methods.
| | Excavation method | Overbreak/cm | Underbreak/cm | BDZ depth/m | Excavation speed | | Maximum | Average | Maximum | Average |
| | Smooth blasting | 41.6 | 7.3 | -5.8 | -2.9 | 0.68~0.71 | Slow | | Presplitting blasting | 16.4 | 16.4 | -24.4 | -18.1 | 0.82~0.86 | Moderate | | BSR | 25.7 | 5.4 | -13.3 | -5.6 | 0.74~0.79 | Fast |
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