Learning from the Mexican Earthquake of September 19, 1985: Behavior of Friction Pile Foundations for Buildings

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This research program will investigate the behavior of friction piles when subjected to cyclic loading in both the vertical and the lateral direction. Specifically, the program will involve: (1) full-scale cyclic load tests in Mexico City clay of a three-pile group and of two single piles with amplitudes chosen to represent the loading history experienced by pile foundations during the September 19, 1985 earthquake; (2) cyclic pressuremeter tests at the site of these load tests to evaluate the in-situ behavior of the clay foundation material under these conditions; and (3) cyclic vertical model pile tests in a controlled laboratory environment, using a rod shear device developed at UCLA, so as to evaluate the soil-pile interface behavior.