Research Article
Mechanical Characteristics of Coal Samples under Triaxial Unloading Pressure with Different Test Paths
Table 1
Triaxial compression test results.
| Lithology | Confining pressure (MPa) | Axial stress difference (MPa) | Damage stress (MPa) | Inflection point ratio | Peak circumferential strain (mm/mm) | Peak axial strain (mm/mm) | Elastic modulus (MPa) | Poisson ratio |
| Coal | 4 | 32. 22 | 30.12 | 82.81% | −0.00202 | 0.00588 | 5522 | 0.23 | 7 | 38.07 | 33.21 | 73.22% | −0.00250 | 0.00689 | 6674 | 0.23 | 10 | 48.87 | — | — | −0.00263 | 0.00781 | 6680 | 0.31 |
|
|