| Model | B | Beta | t | Significance | tolerance | VIF | |
| 3 | constant | 2.903 |
| 0.664 | 0.536 |
|
|
| surrounding rock strength | 1.917 | 0.535 | 5.528 | 0.003 | 1.000 | 1.000 | |
| temperature | −0.214 | −0.299 | −3.084 | 0.27 | 1.000 | 1.000 | |
| anchoring length | 0.510 | 0.760 | 7.851 | 0.001 | 1.000 | 1.000 | |