Research Article
Study on Pressure Relief Effect and Rock Failure Characteristics with Different Borehole Diameters
Table 1
Physico-mechanical parameters of the numerical sandstone model.
| | Parameter | Value |
| | Minimum diameter (mm) | 0.6 | | Maximum diameter (mm) | 1.0 | | Effective modulus of particles (GPa) | 12 | | Effective modulus of parallel bond (GPa) | 15 | | Stiffness ratio of parallel bond | 2.0 | | Friction coefficient | 0.6 | | Density (kg/m3) | 2500 | | Parallel bond tensile strength (MPa) | 24 | | Parallel bond cohesive force (MPa) | 51 | | Particle stiffness ratio | 2.0 |
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