In this work the interaction between adjacent rigid, surface foundations resting on a viscoelastic layered soil medium is studied. A 3-D frequency domain BEM formulation in conjunction with infinite space fundamental solutions and the so called "successive stiffness method", initially developed for elastostatics and adapted here for the solution of elastodynamic problems, are used for the simulation of a layered soil medium. As a result, a discretization of the soil-foundation interface and the surrounding free surface as well as the interfaces between soil layers is necessary. However, it is shown in this work that certain simplifying assumptions can yield accurate results utilizing a substantially reduced discretization scheme. The presented numerical results demonstrate the importance of the dynamic foundation-soil-foundation interaction phenomenon which becomes even more pronounced in case the supporting soil medium is made up of relatively shallow layers close to its free surface.

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