Research Article
Mechanical Properties of Sandstones under Initial Unloading Damage
Table 1
Compliance statistics of strain confining pressure.
| Confining pressure (MPa) | Unloading capacity | 0.00 | 40.00% | 66.67% | 73.33% | 80.00% | 86.67% | 93.33% | 100.00% |
| 12.5 | 100.00 | 0.080 | 0.106 | 0.118 | 0.145 | 0.162 | 0.196 | 0.337 | 13.0 | 93.33 | 0.070 | 0.082 | 0.096 | 0.120 | 0.146 | 0.189 | — | 13.5 | 86.67 | 0.067 | 0.078 | 0.091 | 0.117 | 0.142 | — | — | 14.0 | 80.00 | 0.067 | 0.078 | 0.085 | 0.115 | — | — | — | 14.5 | 73.33 | 0.063 | 0.072 | 0.084 | — | — | — | — | 15.0 | 66.67 | 0.063 | 0.072 | — | — | — | — | — | 17.0 | 40.00 | 0.060 | — | — | — | — | — | — | 20.0 | 0.00 | — | — | — | — | — | — | — |
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