nper | Cumulative settlement (mm) | The BP neural network | Residual (mm) | Relative difference (%) |
21 | 12.90 | 13.0225 | 0.1225 | 0.95 |
22 | 13.60 | 14.0057 | 0.1357 | 1.00 |
23 | 14.37 | 14.5275 | 0.1578 | 1.10 |
24 | 15.18 | 15.3337 | 0.1537 | 1.01 |
25 | 15.93 | 16.0895 | 0.1595 | 1.00 |
26 | 16.52 | 16.7037 | 0.1837 | 1.11 |
27 | 17.19 | 17.4025 | 0.2125 | 1.24 |
28 | 17.98 | 18.2718 | 0.2918 | 1.62 |
29 | 18.67 | 19.0087 | 0.3387 | 1.81 |
30 | 19.25 | 19.6125 | 0.3625 | 1.88 |