Full-Scale Experimental p–y Curves and Model for Plastic Willamette Silt
Publication: IFCEE 2021
ABSTRACT
The p–y method for analysis of the lateral load transfer of deep foundations has been widely accepted in the geotechnical profession. However, the p–y models typically used are often based on one or several full-scale, instrumented loading tests in a specific soil deposit and may not be appropriate for other deposits that exhibit differences in soil fabric, stress history, or geological deposition. Cost-effective application of the p–y method to design deep foundations in a given geological region should leverage high-quality load transfer data derived from the region of interest. This paper presents the p–y curves for a driven pipe pile, uncased drilled shaft, and cased drilled shaft installed and tested in Willamette Silt. Differences and similarities are identified and then used as the basis to develop a simple hyperbolic p–y curve model set within the ultimate lateral resistance framework of an existing, commonly used p–y curve model. Thereafter, simple scaling relationships are provided to extend the model to account for differences in foundation diameter and for a casing installation and shaft construction method used frequently in Willamette Silt. The accuracy and uncertainty in the model are described, and a parametric comparison of the model is presented to illustrate the range in lateral resistance-lateral displacement response of a deep foundation designed using the proposed p–y curves.
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IFCEE 2021
Pages: 207 - 219
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© 2021 American Society of Civil Engineers.
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Published online: May 6, 2021
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