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Past earthquakes have revealed that lateral spreading induced by liquefaction may cause excessive movement, and large localized plastic demands may be generated in the piles. A one-g shake-table experiment using a medium-size laminar soil container was conducted to investigate the mechanism of liquefaction- induced lateral spreading effects on pile foundations. A single reinforced concrete pile of 25 cm diameter was tested under an earthquake excitation in a mildly inclined soil profile. Pile response was characterized using curvature profiles coupled with bending moment estimation and post-test physical observations. In this paper, testing layout is presented along with post shaking observations. Soil and pile lateral displacement as well as excess pore pressure are discussed. Such a pile-ground interaction mechanism is of consequence for analyses that correlate pile bending moments to the accumulated lateral soil deformation as in the conventional p-y soil spring approach.
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