DFI Journal - The Journal of the Deep Foundations Institute

Volume 14, Issue 1, January 2020
DOI: 10.37308/DFIJnl.20191120.212

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Development of Experimental P-Y Curves from Centrifuge Tests for Piles Subjected to Static Loading and Liquefaction-Induced Lateral Spreading
Article Type: Research Paper

Souri, M., Khosravifar, A., Schlechter, S., McCullough, N. & Dickenson, S. E.

Abstract


The results of five centrifuge models were used to evaluate the response of pile-supported wharves subjected to inertial and liquefaction-induced lateral spreading loads. The centrifuge models contained pile groups that were embedded in rockfill dikes over layers of loose to dense sand and were shaken by a series of ground motions. The p-y curves were back-calculated for both dynamic and static loading from centrifuge data and were compared against commonly used American Petroleum Institute p-y relationships. It was found that liquefaction in loose sand resulted in a significant reduction in ultimate soil resistance. It was also found that incorporating p-multipliers that are proportional to the pore water pressure ratio in granular materials is adequate for estimating pile demands in pseudo-static analysis. The unique contribution of this study is that the piles in these tests were subjected to combined effects of iner-tial loads from the superstructure and kinematic loads from liquefaction-induced lateral spreading.

Keywords:
pile foundations; liquefaction; lateral spreading; centrifuge models; p-y curves