Abstract
The present study aims to clarify the mechanical behavior of a sand bed-structure system subjected to cyclic loadings such as wave forces. In order to simulate an element of ground beneath a structure in maritime field, a series of theoretical analysis and model tests were carried out. It was found that 1) the shear stress induced in the ground beneath a structure by wave forces changes with the depth and occurs at a perfectly reversal condition despite of the combinations of external forces, 2) the strength behavior of the ground obtained from the model test has similar tendency to that of cyclic triaxial test and 3) the directions of the external forces play an important role on evaluating the mechanical behavior of the sand bed.
