Analysis of a Single Pile under Vertical and Torsional Combined Loads in Two-Layered Nonhomogeneous Soil
Publication: International Journal of Geomechanics
Volume 19, Issue 6
Abstract
Pile foundations are inevitably subjected to combined vertical-torsional (V-T) loadings in offshore engineering contexts. This article proposes an analytical method for calculating the V-T response of a single pile in two-layered nonhomogeneous soil. First, the results predicted by this new method are validated against experimental data and found to be in good agreement. The behavior of a single pile under combined V-T loads is then subjected to a parametric study, exploring a range of dimensionless parameters related to the thickness of the top layer, the embedment depth of the foundation (or pile length), the relative pile–soil stiffness, soil profiles, and the level of vertical or torsional load mobilization. This reveals two interesting features of the behavior of a pile under combined V-T loads: (1) the loading path (loading sequence) has an effect on load response and deformation; (2) the length–diameter ratio, soil profile parameters, and relative pile–soil stiffness have a significant effect on the behavior of pile under combined V-T loads, but the top layer thickness has a minimal effect.
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Acknowledgments
The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (Grants 51578231, 51378197, and 51508163). This work was also supported by the Fundamental Research Funds for the Central Universities of China (D2171820); State Key Laboratory of Subtropical Building Science, South China University of Technology (2017KA04); and Science and Technology Program of Guangzhou (201707020047).
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Published In
International Journal of Geomechanics
Volume 19 • Issue 6 • June 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Apr 28, 2018
Accepted: Dec 13, 2018
Published online: Apr 10, 2019
Published in print: Jun 1, 2019
Discussion open until: Sep 10, 2019
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