Table 2 Prediction time of rock fracture.
Parameters Coal sample | Alpha negative appears The earliest time /s | Earliest time with rupture Time difference /s | Actual forecast time vs. Difference in time of rupture /s | Earliest timewith ruptureTimedifference /s | Actual forecasttime vsDifference intime of rupture /s |
|---|---|---|---|---|---|
C-4-0.02 | 370.2 | 370.2 | 375.7 | −5.5 | −5.5 |
C-4-0.05 | 295.1 | 312.2 | 319.1 | −24.0 | −6.9 |
C-4-0.08 | 280.6 | 285.5 | 302.6 | −22.0 | −17.1 |
C-7-0.02 | 392.6 | 419.6 | 434.7 | −42.1 | −15.1 |
C-7-0.05 | 370.5 | 370.5 | 375.7 | −5.2 | −5.2 |
C-7-0.08 | 364.2 | 364.2 | 372.1 | −7.9 | −7.9 |
C-10-0.02 | 546.3 | 584.6 | 600.9 | −54.6 | −16.3 |
C-10-0.05 | 501.3 | 501.3 | 508.9 | −7.6 | −7.6 |
C-10-0.08 | 372.1 | 451.2 | 457.8 | −85.7 | −6.6 |
C-10-0.11 | 373.1 | 431.9 | 445.2 | −72.1 | −13.0 |
C-10-0.14 | 436.2 | 436.2 | 445.2 | −9.0 | −9.0 |
