Effect of Installation on the Uplift Capacity of Helical Pile Considering Soil Spatial Variability
Publication: Geo-Risk 2023
ABSTRACT
As the offshore industry moves into deeper water, helical piles are emerging as a potential foundation solution option. Numerous researchers have made great efforts to explore the uplift response of helical piles in clay. However, in most previous studies, the wished-in-place assumption was adopted, and the inherent spatial variability of soil strength was also neglected. The present research explores these two effects on the uplift behavior of helical piles through a large deformation random finite element method. A strain-softening soil constitutive model proposed in past literature is employed to model the soil strength remoulding caused by the pile installation and extraction process. The validity of the numerical model used to simulate the installation process and the subsequent uplift process is verified by the installation torque and the uplift capacity, respectively. The spatial variation of soil strength is modeled as a random field, and then a series of Monte Carlo simulations are performed to investigate the installation torque and uplift capacity of the helical piles under different random realizations. The analysis results show that for the helical piles with different penetration depths, the installation effect as well as the random distribution of the soil strength markedly affects the uplift capacity. Moreover, a probabilistic analysis of the uplift capacity is conducted, which might provide a reference for the safety design of the helical pile considering the influence of the installation process.
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REFERENCES
Chen, X. J., Fu, Y., and Liu, Y. (2022). “Random finite element analysis on uplift bearing capacity and failure mechanisms of square plate anchors in spatially variable clay.” Engineering Geology, 304, 106677.
Chen, X. J., Li, D. Q., Tang, X. S., and Liu, Y. (2021). “A three-dimensional large-deformation random finite-element study of landslide runout considering spatially varying soil.” Landslides, 18(9), 3149–3162.
Cheng, P., Guo, J., Yao, K., and Chen, X. J. (2022a). “Numerical investigation on pullout capacity of helical piles under combined loading in spatially random clay.” Marine Georesources & Geotechnology, 1–14.
Cheng, P., Liu, Y., Li, Y. P., and Yi, J. T. (2022b). “A large deformation finite element analysis of uplift behaviour for helical anchor in spatially variable clay.” Computers and Geotechnics, 141, 104542.
Einav, I., and Randolph, M. F. (2005). “Combining upper bound and strain path methods for evaluating penetration resistance.” International journal for numerical methods in engineering, 63(14), 1991–2016.
Kwon, O., Lee, J., Kim, G., Kim, I., and Lee, J. (2019). “Investigation of pullout load capacity for helical anchors subjected to inclined loading conditions using coupled Eulerian-Lagrangian analyses.” Computers and Geotechnics, 111, 66–75.
Liu, Y., Lee, F. H., Quek, S. T., and Beer, M. (2014). “Modified linear estimation method for generating multi-dimensional multi-variate Gaussian field in modelling material properties.” Probabilistic Engineering Mechanics, 38, 42–53.
Merifield, R. S. (2011). “Ultimate uplift capacity of multiplate helical type anchors in clay.” Journal of Geotechnical and Geoenvironmental engineering, 137(7), 704–716.
Wang, D., Merifield, R. S., and Gaudin, C. (2013). “Uplift behaviour of helical anchors in clay.” Canadian Geotechnical Journal, 50(6), 575–584.
Yi, J. T., Huang, L. Y., Li, D. Q., and Liu, Y. (2020). “A large-deformation random finite-element study: failure mechanism and bearing capacity of spudcan in a spatially varying clayey seabed.” Géotechnique, 70(5), 392–405.
Yu, H., Zhou, H., Sheil, B., and Liu, H. (2022). “Finite element modelling of helical pile installation and its influence on uplift capacity in strain softening clay.” Canadian Geotechnical Journal, 59(12), 2050–2066.
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Information
Published In
Geo-Risk 2023
Pages: 347 - 356
History
Published online: Jul 20, 2023
ASCE Technical Topics:
- Coasts, oceans, ports, and waterways engineering
- Engineering fundamentals
- Finite element method
- Foundations
- Geomechanics
- Geometry
- Geotechnical engineering
- Mathematics
- Methodology (by type)
- Models (by type)
- Numerical methods
- Numerical models
- Ocean engineering
- Offshore structures
- Pile foundations
- Piles
- Soil dynamics
- Soil mechanics
- Soil properties
- Soil strength
- Spatial variability
- Uplifting behavior
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