Table 2 The micro-parameters of the numerical models of granite and red sandstone.
Micro-Parameters | Granite | Sandstone |
|---|---|---|
Minimum particle size, \({d_{\hbox{min} }}\)/mm | 0.60 | 0.60 |
Ratio of maximum particle size to minimum particle size, \({d_{\hbox{max} }}/{d_{\hbox{min} }}\) | 1.66 | 1.66 |
Porosity ratio \(\rho\) | 0.06 | 0.06 |
Coordination number, N | 4.00 | 4.00 |
Effective modulus of particle and bond, \({E_{\text{c}}}{\text{=}}{\overline {E} _{\text{c}}}\)/ GPa | 53.20 | 15.70 |
Ratio of normal to shear stiffness of particle and bond, \({k_{\text{n}}}{\text{/}}{k_{\text{s}}}{\text{=}}{\overline {k} _{\text{n}}}{\text{/}}{\overline {k} _{\text{s}}}\) | 2.26 | 2.77 |
Element bond tensile strength, \({\overline {\sigma } _{\text{c}}}\)/MPa | 22.15 | 8.57 |
Element bond cohesion strength, \(\overline {c}\)/MPa | 52.40 | 29.65 |
Local friction angle, \({\overline {\varphi } _{\text{c}}}\)/° | 15.00 | 25.00 |
Residual friction coefficient, µ | 0.30 | 0.30 |
