Table 2 Precursor point information of instability failure.
Ra (mm/s) | Cumulative AE events | Cumulative AE energy | AE b-values | ||||||
---|---|---|---|---|---|---|---|---|---|
AEc−events104 | t(s) | σ(MPa) | AEc−energy105(mv·s) | t(s) | σ(MPa) | AE-b | t(s) | σ(MPa) | |
0.002 | 8.85 | 657.93 | 92.32%σc | 4.34 | 655.54 | 91.53%σc | 1.0852 | 665.88 | 92.36%σc |
0.004 | 15.09 | 600.81 | 93.76%σc | 7.62 | 583.66 | 95.64%σc | 1.0824 | 601.96 | 94.76%σc |
0.006 | 50.99 | 463.06 | 94.93%σc | 28.11 | 457.41 | 95.07%σc | 1.1049 | 458.80 | 96.85%σc |
0.008 | 83.44 | 425.39 | 96.16%σc | 38.91 | 420.19 | 96.37%σc | 1.1247 | 430.26 | 97.42%σc |