Theoretical Analysis of Postconstruction Load-Carrying Capacity of a Cast-in-Place Pile Installed in K0-Consolidated Anisotropic Clayey Soil
Publication: International Journal of Geomechanics
Volume 21, Issue 9
Abstract
This paper analytically investigates the postconstruction load-carrying capacity of a cast-in-place pile in clayey soil. The stress release induced by borehole excavation, the slurry supporting effects, and the dissipation of the negative excess pore-water pressure after construction, all of which have significant effects on the effective stresses of the soil around the pile, are the main concerns of this study, which aim to establish a method to reasonably evaluate the load-carrying capacity of a cast-in-place pile after construction. The stress release due to borehole excavation is modeled by cylindrical cavity contraction theory, which employs a K0-consolidated anisotropic modified Cam-clay (K0-AMCC) model to represent the mechanical behavior of the soil. Considering the dissipation of the negative excess pore pressure, the load-carrying capacity after construction is determined by the total stress method, with consideration of the three-dimensional strength of the soil adjacent to the pile. The proposed method was verified by finite-element (FE) numerical simulations. The results indicate that the soil properties and the factors involved in pile construction, such as the stress release due to borehole excavation, the slurry supporting effects, and the dissipation of negative excess pore-water pressure, have substantial influences on the postconstruction load-carrying capacity of the pile.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51878487 and 52008246), Shanghai Sailing Program (Grant No. 19YF1436700), and Open Research Project from Key Laboratory of Geotechnical and Underground Engineering, Tongji University (Grant No. KLE-TJGE-B1801). Financial support from these organizations is gratefully acknowledged.
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International Journal of Geomechanics
Volume 21 • Issue 9 • September 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Oct 20, 2020
Accepted: May 7, 2021
Published online: Jun 25, 2021
Published in print: Sep 1, 2021
Discussion open until: Nov 25, 2021
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