Research Article
Mechanism of Hard-Roof Rock Burst Control by the Deep-Hole Blasting: Numerical Study Based on Particle Flow
Table 1
Mesoscopic mechanical parameters of the particle model.
| | Lithology | Minimum particle radius (mm) | Particle radius ratio | Particle density (kg/m3) | Particle contact modulus (GPa) | Normal tangential stiffness ratio | Particle friction coefficient | Parallel bond modulus (GPa) | Parallel bond stiffness ratio | Normal bond strength (MPa) | Shear bond strength (MPa) |
| | Siltstone | 100 | 1.66 | 2600 | 4.2 | 1.6 | 0.25 | 4.2 | 1.6 | 8.8 | 17.3 | | Sandy mudstone | 100 | 1.66 | 2500 | 1.8 | 1.6 | 0.25 | 1.8 | 1.6 | 5.5 | 15.6 | | Grit sandstone | 100 | 1.66 | 2550 | 5.0 | 1.8 | 0.25 | 5.0 | 1.8 | 10.1 | 18.5 | | Medium sandstone | 100 | 1.66 | 2500 | 9.1 | 1.7 | 0.25 | 9.1 | 1.7 | 15.2 | 27.5 | | Fine sandstone | 100 | 1.66 | 2500 | 2.6 | 1.5 | 0.25 | 2.6 | 1.5 | 7.5 | 18.8 | | Mudstone | 70 | 1.66 | 2500 | 2.5 | 1.4 | 0.25 | 2.5 | 1.4 | 5.6 | 12.0 | | 4# coal seam | 50 | 1.66 | 1350 | 0.8 | 1.2 | 0.25 | 0.8 | 1.1 | 3.5 | 6.3 | | Carbon mudstone | 70 | 1.66 | 2500 | 1.4 | 1.4 | 0.25 | 1.4 | 1.4 | 4.4 | 9.1 |
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