Predicting Time-to-Failure of Red Sandstone by Temporal Precursor of Acoustic Emission Signals

Table 1

The results of predicting time-to-failure of rocks. Nos. 1~4 are the results of specimen R1. Nos. 5~8 are the results of specimen R6.

No.	Fit data	Fit equation	-square	Prediction time (s)	Error (s)
1	Figure 5(a)		0.9725	786.5	-0.7
2	Figure 6(a)		0.9787	790.7	3.5
3	Figure 7(a), Line 1		0.9923	788.9	1.7
4	Figure 7(a), Line 2		0.9985	787.0	-0.2
5	Figure 5(b)		0.9824	2502.7	70.7
6	Figure 6(b)		0.9737	2500.0	68.0
7	Figure 7(b), Line 1		0.9904	2478.9	46.9
8	Figure 7(b), Line 2		0.9972	2423.8	-8.1