Research Article
Numerical Simulation of Surface Subsidence and Backfill Material Movement Induced by Underground Mining
Table 2
Microscopic parameters of the PFC model.
| Micro parameters | Ore body | Slate | Marble |
| Particle contact modulus, Ec (GPa) | 19.03 | 12.36 | 11.37 | Particle stiffness ratio, kn/ks | 1.8 | 2.0 | 2.5 | Particle friction coefficient, μ | 0.5 | 0.5 | 0.5 | Parallel-bond radius multiplier, | 1.0 | 1.0 | 1.0 | Parallel-bond modulus, (GPa) | 19.03 | 12.36 | 11.37 | Parallel-bond stiffness ratio, | 1.8 | 2.0 | 2.5 | Normal strength, (MPa) | 13.89 ± 2.78 | 6.56 ± 1.31 | 3.49 ± 0.70 | Shear strength, (MPa) | 20.84 ± 4.17 | 9.84 ± 1.97 | 5.24 ± 1.05 |
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