SYMPOSIA PAPER Published: 01 January 1984

Analysis of a Pile Group Under Lateral Loading


One of the current approaches to the design of pile-supported structures in deep water is to place a cluster of piles along each of the four main legs of the platform. The piles in such a group would be in a circular pattern and spaced sufficiently close that significant interaction among piles in the soil would be expected.

The analysis of such a typical pile group in stiff clay is presented. Three approaches were used for performing the analyses: the Poulos-Focht-Koch approach, a modification of that approach, and the treatment of the pile group as an imaginary large diameter pile. With each of these methods, analyses were performed to investigate the effect of the variation of significant soil parameters through a range indicated by a study of the results from a field and laboratory investigation of soil properties. In each of the analytical approaches the methods of analysis of piles under lateral loading that makes use of curves showing soil resistance as a function of pile-deflection (p-y curves) were used.

The results of the analyses indicate the importance of the various parameters that are employed in the solution and should provide guidance in the acquisition of data on soil properties.

Author Information

Reese, LC
University of Texas, Austin, Tex.
Wright, SG
University of Texas, Austin, Tex.
Aurora, RP
Marathon Oil United Kingdom, London, England
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Developed by Committee: D18
Pages: 56–71
DOI: 10.1520/STP36813S
ISBN-EB: 978-0-8031-4901-4
ISBN-13: 978-0-8031-0207-1