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New P-Y curve formulation for laterally loaded single piles based on the pre-bored pressuremeter

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Abstract

A new practical formulation of the load-transfer P-Y curves to analyze the load–deflection response of a single pile under lateral loads is proposed in this paper. Parameters of the P-Y curves, namely the lateral reaction modulus and the lateral soil resistance, were correlated to the pre-bored pressuremeter (PMT) data as well as to the pile/soil stiffness ratio. A total of 16 full-scale monotonic lateral loading tests carried out in six experimental sites in France, representing a variety of soil conditions, were interpreted focused on the construction of the experimental P-Y curves along the test pile.

For practical purposes, a methodology of construction of the P-Y curves was proposed. Moreover, the paper highlights the new concept of the critical deflection, which is the threshold of the nonlinear pile/soil response, as well as a classification of piles based on the pile/soil stiffness ratio.

The process of validation of the proposed P-Y curve-based method was undertaken by comparing the predicted load–deflection curves to the experimental curves of several test piles within a medium-sized database, and a very good predictive capability was noticed.

At last, the concept of the normalized load–deflection curve was introduced to estimate the pile deflection during a preliminary stage of pile design.

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Acknowledgements

The author is grateful to Mr. Jacques Roudier, General Manager of the LCPC Laboratory, for authorizing him to access to the experimental data of full-scale lateral loading tests of piles carried out by the LCPC, as well as to the Ph.D and M.Sc students team who worked for many years on this topic under supervision of the author.

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Correspondence to Bouafia Ali.

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Ali, B. New P-Y curve formulation for laterally loaded single piles based on the pre-bored pressuremeter. Arab J Geosci 16, 684 (2023). https://doi.org/10.1007/s12517-023-11804-4

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