抄録
When repeated loads are applied to a foundation, the deformation of the foundation soil may increase significantly in comparison with the case of static load applications. For this reason an unconventional calculation in the case of repeated loading needs to be made for estimating the deformation of the soil. Among the various types of repeated loads some typical examples are earthquake forces, vehicle loads and oil storage tank loads.Specially-devised consolidation tests under static and repeated loading were performed on remolded saturated cohesive soil samples. The samples under repeated loading conditions were more compressible than those under static loading conditions, and the difference in compressibility or settlement between these two loading conditions seems to be due to secondary compression and the change in soil particle structures.As the settlement of the foundation under repeated loading is caused and governed primarily by the magnitude of total load, the loading period, the load increment ratio and the number of load cycles, it is suggested that all of these factors should be considered in predicting the settlement induced by repeated loading. In this paper, therefore, we aim at presenting some basic data and an interpretation of the consolidation of clay under repeated loading. In addition, based on a simplified method for prediction, a case study of settlement calculation is shown for an oil tank foundation on clay. The necessity of repeated oedometer tests and their analysis is emphasized by comparison of settlement under cyclic loading with that under static loading.
