Parameter | Symbol | σRB | IRB |
G1 | G2 | G3 | G4 |
Depth (m) | H | Y | Y | Y | Y |
Unixial Compressive Strength (MPa) | UCS | Y | Y | Y | Y |
Deformability modulus (GPa) | E | Y | Y | Y | Y |
Horizontal in situ stress (loading face) (MPa) | σh1 | Y | Y | - | - |
Horizontal in situ stress (unloading face) (MPa) | σh2 | Y | Y | - | - |
Vertical stress due to overburden | σv | Y | Y | - | - |
Percentage of clay (%) | Cl | - | Y | - | - |
Percentage of quartz (%) | Q | - | Y | - | - |
Percentage of feldspar (%) | F | - | Y | - | - |
Percentage of calcite (%) | Ca | - | Y | - | - |
Percentage of carbon (%) | Cb | - | Y | - | Y |
Volume of the sample | Vol | - | Y | - | - |
Rockburst maximum stress (MPa) | σRB | - | - | Y | Y |
Ratio between average horizontal stresses and σv | K | - | - | Y | Y |