| Model | B | Beta | t | Significance | tolerance | VIF | |
| 1 | constant | 0.611 |
| 0.082 | 0.939 |
|
|
| lateral pressure coefficient | 2.292 | 0.043 | 0.402 | 0.708 | 1.000 | 1.000 | |
| surrounding rock strength | 1.917 | 0.535 | 5.043 | 0.007 | 1.000 | 1.000 | |
| temperature | −0.214 | −0.299 | −2.814 | 0.048 | 1.000 | 1.000 | |
| anchoring length | 0.510 | 0.760 | 7.162 | 0.002 | 1.000 | 1.000 | |