3-D Deformation Analysis of Pile Groups During Wave Loading

by M. Gabr, West Virginia Univ, Morgantown, United States,
Per Magne Aas, West Virginia Univ, Morgantown, United States,
J. Wang, West Virginia Univ, Morgantown, United States,



Document Type: Proceeding Paper

Part of: Design and Performance of Deep Foundations: Piles and Piers in Soil and Soft Rock

Abstract:

Deformation predictions of pile group supporting one leg of Magnus platform were conducted using the 3-D nonlinear computer program SPLICE (Structure/Pile/Soil Interaction Analysis) and the 3-D linear computer program CPGA. These programs were developed by the Norwegian Geotechnical Institute and the U.S. Army Corps of Engineers, respectively. The analysis results were compared to field measurements recorded during a wave storm. Using measured load combinations, axial displacement measured in the field was accurately predicted by both models. The measured group rotation was also reasonably predicted while the measured lateral displacement was underestimated. This underestimation may be due to the assumption that soil stiffness (E) was constant with depth which simulated a relatively stiff top layer that did not exist in the field. Assuming a linear variation of E with depth, better estimates of the lateral displacement and rotation using both SPLICE and CPGA were achieved.

Subject Headings: Offshore structures | Three-dimensional analysis | Computer analysis | Axial loads | Soil-pile interaction | Underwater structures | Underwater foundations

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