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This paper studies the efficiency of subgrade stiffening next to the track as a mitigation measure for railway induced vibrations by means of a two-and-a-halfdimensional coupled finite element – boundary element methodology. The pyhsical mechanism is interpreted in the frequency–wavenumber domain, illustrating that the stiffened block of soil next to the track can act as a wave impeding barrier. The existence of a critical frequency from which this mitigation measure starts to be effective, as well as a critical angle delimiting the area where the vibration levels are reduced, is demonstrated in this paper. Two realistic ca se studies are discussed to indicate that the effectiveness of the proposed mitigation measure depends on the stiffness contrast between the soil and the stiffened block of soil. Keywords— Dynamic soil-structure interaction, railway induced vibrations, mitigation measures on the transmissi on path, frequency–wavenumber analysis

A NUMERICAL STUDY OF SUBGRADE STIFFENING AS A MITIGATION MEASURE FOR RAILWAY INDUCED VIBRATIONS THROUGH 2.5D AND 3D FE-BE MODELS