Table 5 CI and CD thresholds determined by AE energy and their ratio to corresponding peak compression strength of granite specimen at various inclination angles.
Experimental scenario (θ) | Experimental case | σCI (MPa) | Mean value (MPa) | σCD (MPa) | Mean value (MPa) | σCI/IUCS (%) | σCD/IUCS (%) |
|---|---|---|---|---|---|---|---|
0° | 1–1 | 54.25 | 51.54 ± 3.24 | 98.55 | 99.31 ± 3.91 | 40.3 | 77.65 |
1–2 | 52.07 | 96.17 | |||||
1–3 | 48.30 | 103.22 | |||||
5° | 2–1 | 51.82 | 50.69 ± 4.16 | 90.61 | 91.68 ± 1.66 | 47.68 | 86.25 |
2–2 | 53.71 | 93.34 | |||||
2–3 | 46.53 | 91.09 | |||||
10° | 3–1 | 32.75 | 32.94 ± 1.14 | 65.47 | 65.83 ± 1.38 | 45.31 | 90.55 |
3–2 | 34.08 | 67.21 | |||||
3–3 | 32.00 | 64.81 | |||||
20° | 4–1 | 24.70 | 24.59 ± 1.66 | 39.05 | 38.03 ± 1.75 | 54.40 | 84.14 |
4–2 | 22.93 | 38.76 | |||||
4–3 | 26.14 | 36.28 |
