Research Article
A New Unified Solution for Circular Opening considering Different Strength Criteria and the Postpeak Elastic Strain Form
Table 2
Geometrical and physical parameters of circular opening.
| Parameters | Rock type by Park and Kim (2006) [10] | Hard rock | Soft rock |
| Radius of opening, (m) | 1 | 1 | Initial stress, (MPa) | 1 | 1 | Internal pressure, (MPa) | 0 | 0 | Young’s modulus, (MPa) | 50,000 | 5000 | Poisson’s ratio, | 0.2 | 0.2 | Shear modulus, (MPa) | 20833 | 2083 | (MPa) | 0.173 | 0.276 | (deg) | 55 | 35 | (MPa) | 0.061 | 0.055 | (deg) | 52 | 30 |
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