Recent major seismic events such as Loma Prieta 1989, Kobe 1995, and Izmit 1999 earthquakes continue to demonstrate the damaging effects of liquefaction-induced loss of soil strength and associated damage to waterfront and port structures. This paper presents the experimental results from a series of dynamic centrifuge model tests performed to investigate the seismic behavior of rubble-mound moles resting on loose, clean, sandy marine deposits. Soil response during and after shaking was monitored by miniature accelerometers, pore pressure transducers, and vertical and horizontal displacement gages placed throughout the soil model. Currently, such test results offer a valuable alternative to actual full-scale dynamic response, which is virtually non-existent. It was found that catastrophic failures of even structurally-strong moles are possible if they are underlain by loose liquefiable soils. Densification and usage of a geogrid mat as liquefaction-induced hazards countermeasures are also evaluated. Both methods much improved the liquefaction induced deformations in the foundation and of the mole.

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