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

该研究项目将研究摩擦桩在竖向和横向循环荷载作用下的性状。具体来说，该计划将涉及：(1)在墨西哥城粘土中进行三桩群和两根单桩的全尺寸循环荷载试验，所选幅度代表1985年9月19日地震期间桩基础经历的荷载历史；(2)在这些荷载试验现场进行循环压力计试验，以评估粘土地基材料在这些条件下的现场性状；(3)利用加州大学洛杉矶分校研制的杆式剪切仪，在受控的室内环境中进行循环竖向模型桩试验，以评价土-桩界面性状。

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.