The vibrations generated by surface or underground transportation propagate in the ground and penetrate into buildigns through their foundations or underground elements such as buried walls (parking places for instance). The purpose of this presentation is to report the results of a study carried for the French Government (1) concerning the use of isolating layers placed between the ground and the buried structures. A 2D-Boundary/Finite element program has been developed and employed to simulate different configuraitons. Parameters such as the source position, the type and composition of ground, the type, size, thickness and positioning of isolating layers, the influence of the size of the superstructure, the type of buried structures, the type of source spectra have been considered. The determination of a pertinent indicator has also been addressed. The effect of the isolating layers has been best evaluated by computing sound pressure levels inside the buildings.
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