Table 2 Input parameters for PFC3D model
From: Discrete element modeling of a mining-induced rock slide
Parameters | Sandstone | Carbon shale | Coal |
|---|---|---|---|
Model height (mm) | 100 | Â | Â |
Model width (mm) | 50 | Â | Â |
Particle size (mm) | 1.09 (diameter) | Â | Â |
Number of particles | 39,086 | Â | Â |
Total time step | 1.3 × 105 |  |  |
Porosity (%) | 15 | 15 | 15 |
Particle density (kg/m3) | 3000 | 2700 | 2400 |
Particle friction coefficient (μ) | 0.38 | 0.75 | 0.62 |
Bond radius ratio (λ) | 1 | 1 | 1 |
Normal contact stiffness (GPa) | 11.8 | 4.2 | 0.5 |
Shear contact stiffness (GPa) | 8.44 | 2.3 | 0.5 |
Parallel bond normal stiffness (GPa) | 5.3 | 2.4 | 1.0 |
Parallel bond shear stiffness (GPa) | 4.0 | 1.3 | 0.5 |
Normal bond strength (MPa) | 80 | 10 | 5 |
Shear bond strength (MPa) | 80 | 10 | 5 |