Research Article
Presplit Blasting Technique in Treating Hard Overlying Strata: From Numerical Simulation to Field Practice
Table 1
Key test results of rock samples.
| Rock samples | UCS (MPa) | Tensile strength (MPa) | Elastic modulus (GPa) | Poisson’s ratio | Friction angle |
| Fine sandstone | 95.0 | 9.5 | 35.1 | 0.2 | 30.0 | Medium sandstone | 72.0 | 7.5 | 25.0 | 0.2 | 31.0 | Sandy mudstone | 55.0 | 2.5 | 14.0 | 0.2 | 34.0 | 3# coal seam | 14.5 | 2.0 | 4.3 | 0.4 | 31.0 | Mudstone | 30.0 | 2.2 | 12.2 | 0.2 | 29.0 |
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