Table 4 CI and CD thresholds determined by AE count 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 | 54.70 | 53.30 ± 1.54 | 101.58 | 100.43 ± 3.16 | 41.67 | 78.52 |
1–2 | 51.76 | 97.27 | |||||
1–3 | 53.43 | 102.44 | |||||
5° | 2–1 | 51.46 | 51.37 ± 2.44 | 92.50 | 94.09 ± 1.59 | 48.32 | 88.52 |
2–2 | 53.71 | 95.32 | |||||
2–3 | 48.93 | 94.46 | |||||
10° | 3–1 | 34.52 | 32.23 ± 2.29 | 67.24 | 68.85 ± 1.61 | 44.34 | 94.70 |
3–2 | 31.68 | 69.81 | |||||
3–3 | 30.50 | 69.50 | |||||
20° | 4–1 | 24.50 | 24.25 ± 1.56 | 38.60 | 38.79 ± 2.03 | 53.66 | 85.81 |
4–2 | 22.69 | 40.82 | |||||
4–3 | 25.57 | 36.94 |
