Abstract
Theoretical solutions of p-y curve for a pile or a buried pipe loaded by lateral soil movements are presented. These formulations are based on the elasto-plastic theory under some assumptions of deformation pattern of soil around the pile. The models can express the behavior from initial elastic state to ultimate state and take the appearance of the void behind the pile into the account. In order to validate the models, the pull-out tests of model piles lying in clay were carried out. It is conformed that one of the models compares very well with the results of the tests until the drop of the contact pressure due to the void occurs.
