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The adverse effccts of high frequency vibrations generated by machinc foundations or traffic may bc prevented through the installation of suitable wave barriers in the ground. Direct Boundary Element Method (BEM) is used to conduct an extensive numerical investigation on the influence of various geometrical and material parameters on the effectiveness of open and in-filled trench barriers in rcducing steady-state ground vibrations. based on the numerical study, empirical design formulae and design guidclines have been proposed for such barriers. The reliability of the numerical results and empirical formulae has been established through comparison with published numerical and experimental data. Field experinnents have also been conducted to test the performance of in-filled trench barricrs, backfiled with concrete (stiffer material than soil) and soil-bcntonite mixturc (sofer material than soil). Thc performance …