Study on the Enhancement Effect and Design Method of Grouted Screw Anchors in Mucky Soils
Publication: International Journal of Geomechanics
Volume 24, Issue 11
Abstract
Screw anchor foundations are widely used in wind power and power transmission projects owing to their fast construction speed and low construction difficulty. However, their widespread application is constrained by their low bearing capacity per anchor and poor corrosion resistance when buried underground. To address these issues, this study conducted field experiments on six ungrouted screw anchor (UGSA) foundations and six grouted screw anchor (GSA) foundations in mucky soil, obtained Q–w curves, depth-torque curves, and surface displacement‒load curves for UGSAs and GSAs. The study also analyzed the effects of grouting uplift and the presence of cracks in screw anchor foundations. The results show that the grouting uplift effect is optimal for small-diameter screw anchor rods, reaching 58.49%, and the depth-to-diameter ratio has a minor impact on the bearing capacity of GSAs but significantly affects UGSAs. Additionally, the torque coefficient of GSAs is greater than that of UGSAs and decreases with increasing anchor rod diameter. Furthermore, the failure modes of UGSAs and GSAs were observed based on surface crack observations. Finally, based on the UGSAs design formula, a design formula for GSAs is proposed.
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Data Availability Statement
All data, models, and codes generated or used during the study appear in the published paper.
Acknowledgments
The first author is thankful to Mr. Chen Zhongfan for his help in the preliminary work of the experiment. This work is supported by the National Natural Science Foundation of China (No. 52078120).
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Published In
International Journal of Geomechanics
Volume 24 • Issue 11 • November 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Sep 5, 2023
Accepted: May 20, 2024
Published online: Aug 27, 2024
Published in print: Nov 1, 2024
Discussion open until: Jan 27, 2025
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