Table 2 Error analysis of damage variables for rock samples at different free immersion durations.

From: Investigation of internal damage evolution in gneiss considering water softening

Free immersion durations/months

Number

Measured value

Predicted value

Error rate/%

1

S-1-1

0.132

0.145

8.76

S-1-2

0.149

2.68

S-1-3

0.158

8.23

3

S-3-1

0.384

0.377

1.83

S-3-2

0.398

5.28

S-3-3

0.374

0.80

6

S-6-1

0.604

0.673

10.25

S-6-2

0.632

6.49

S-6-3

0.607

9.81

9

S-9-1

0.914

0.908

0.66

S-9--2

0.889

2.13

S-9-3

0.933

2.68