In order to reveal the mechanical behavior of a sand bed bearing a structure subjected to external forces such as wave forces, a series of model tests were performed on a model structure by using the soil box with the two-dimensional plane strain condition and the cyclic and static loading systems. On the basis oftest data obtained from these tests, a prediction method for displacements ofground-structure system is proposed. The main conclusions obtained from this study are as follows;

  1. the characteristics of lateral flow deformation depend on the settlement behavior of a structure.

  2. A prediction method of displacements of a coastal structure proposed based on dilatancy characteristics of a sand ground is available for estimating the deformations of ground-structure system.


For the design of a structure subjected to wave forces, it is important to clarify the characteristics of deformation under the cyclic load-structure-ground interactions. However, experimental and analytical studies on the mechanical behavior of ground-structure system are rather limited due to that the failure mode of the ground bearing a structure is complex. Therefore, the fundamentals of cyclic behaviors of the ground are investigated by using the soil box with the two-dimensional plane strain condition. Especially, the relationship between the flow deformation of the sand ground and the displacement of a structure is investigated.


Figure 1 shows the whole view of apparatus developed by Miura et al (1995). The soil container was 2000mm in length, 700mm in depth and 600mm in width, and its front wall was made of a reinforced glass to observe the deformation of a sand bed with movement of a model structure. In the model test, the various loads are given to a model structure by means of the static and cyclic loading systems.

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