Support for conducting the centrifuge tests was provided by Grant No. CMS-9702744 from the National Science Foundation (NSF) and Grant No. SA2394JB from the Pacific Earthquake Engineering Research Center. Support for performing recent analyses on the centrifuge test results was provided by Grant No. CMMI-1761712 from NSF and Grant No. 171126 from the Deep Foundations Institute.
Proceedings of the 44th Annual Conference on Deep Foundations
Piling (Civil engineering), Soil liquefaction, Centrifuges -- Mathematical models, Soil mechanics
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 API p-y relationships. It was found that a significant reduction in ultimate soil resistance occurred in dynamic p-y curves in partially/fully liquefied soils as compared to static p-y curves. 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 pseudostatic analysis.
Souri, M., Khosravifar, A., Schlechter, S., McCullough, N. & Dickenson, S. E. (2019). “Experimental P-Y Curves from Centrifuge Tests on Pile Foundations Subjected to Liquefaction and Lateral Spreading.” Proc. 44th Annual Conference on Deep Foundations, Deep Foundations Institute, Chicago, Illinois, October 15-18, 685-694.