Table 1 The test scheme of graded cyclic loading with different amplitude.
From: Study on the energy characteristics of rocks under cyclic loading and unloading
Rock types | Confining pressure (MPa) | Strain upper limit | Strain lower limit | Upper limit increment | Lower limit increment |
|---|---|---|---|---|---|
Sandstone | 5 | 0.5 | 0 | 0.1 | 0 |
10 | |||||
15 | |||||
20 | |||||
25 | |||||
Granite | 5 | 0.1 | 0 | 0.1 | 0 |
10 | |||||
15 | |||||
20 | |||||
25 |
