| Rc | Uniaxial compressive strength |
| Rr | Tensile strength |
| Rcr | Residual strength |
| E | Young’s modulus |
| M | Post-critical module |
| εkr | Critical strain |
| εr | Residual strain |
| ρb | Bulk density |
| c | Cohesion |
| φ | Angle of internal friction |
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