Abstract
In horizontal directional drilling (HDD) construction, the rig pulling load is the load directly applied to the rig, which is an important basis for selecting power and checking capability of drilling equipment. Existing models cannot directly calculate the rig pulling load during the pull-back process. In this study, a model that takes into account the influence of the drill string and the soil pressure was developed to predict rig pulling load. The accuracy of the model is verified by comparison with existing models and field tests. The results show that pullback capability of rig should be determined by the maximum rig load instead of the maximum pull head load. For lighter high-density polyethylene (HDPE) pipes, using the mud with good lubrication function is the most effective to reduce the maximum rig load, however, for heavier steel pipes, the most effective way to reduce the maximum rig load is choosing pipe delivery method with less resistance. The field test proves that the model can predict the rig load accurately when installing pipes in water-rich unstable strata.
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Acknowledgments
This work is supported by the National Key R&D Program of China (No.2018YFC1802404), the National Natural Science Foundation of China (No. 41672366), and the Fundamental Research Funds for the Central Universities (No. 292018093). Meanwhile, great thanks also go to former researchers for their excellent works, which give great help for our academic study.
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Kong, L., Wang, Y. & Wang, Z. Rig Load Prediction Model in Horizontal Directional Drilling within Water-Rich Unstable Strata. KSCE J Civ Eng 26, 556–568 (2022). https://doi.org/10.1007/s12205-021-0088-8
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DOI: https://doi.org/10.1007/s12205-021-0088-8