Research Article
An Improved Model to Calculate Pullback Force of Trenchless Horizontal Directional Drilling Pipeline
Table 1
Comparison of pullback forces in three cases.
| Calculation method | Engineering | AA | BB | CC |
| Unloading arch earth pressure method (kN) | 2261 | 1221 | 923 | Winch calculation method (kN) | 718 | 693 | 997 | Actual pullback force (kN) | 810 | 997 | 681 |
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