Research Article
Research on Effects of Blast Casting Vibration and Vibration Absorption of Presplitting Blasting in Open Cast Mine
Table 4
Mechanical parameters of rock mass of Heidaigou open cast.
| Stratum | Density (kN/m3) | Internal friction angle (°) | Cohesion (kPa) |
| Loess | 19.50 | 29.5 | 45.1 | Sandy mudstone | 24.50 | 30 | 135 | Fine sandstone | 24.50 | 28 | 150 | Medium sandstone | 22.70 | 31.5 | 150 | Coarse sandstone | 22.40 | 32.0 | 130 | Weathered mudstone | 24.7 | 29.0 | 127.5 | Coal | 14 | 35 | 185.1 | Siltstone | 24.5 | 31.3 | 176.8 |
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