Numerical investigation of vibration screening using single and dual open trenches in a layered soil media

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4. Numerical investigation of vibration screening using single and dual open trenches in a layered soil media

Ground vibrations due to heavy machinery, traffic and construction activities have become a major concern to civil engineering structures. The surface vibrations caused by these sources decrease slowly with the distance. These vibrations can be minimized by using the trenches. In this study, the efficacy of the dual open trenches as a wave barrier has been investigated and quantified in a layered soil media. A finite element model was developed to simulate wave propagation due to dynamic excitation. At first, the model was validated with the results obtained from the full-scale experimental studies. Next, the validated model was further used to study the effects of trench dimensions and spacing on vibration isolation. The results highlight that the normalized depth of the trenches primarily governs the vibration screening. The performance of the dual open trenches was found superior to the single open trenches. The dual open trenches with a normalized depth of 0.4 achieved the amplitude reduction ratio, The ARR at a distance of 0.1L_R (Rayleigh wavelength) from the trench was observed 52% lesser for dual open conditions than single open conditions for a trench depth of 0.4L_R. The maximum screening was observed when the spacing of the trenches was in the range of 1.00-1.25L_R.

10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)

2. Finite element, finite difference, discrete element, material point and other methods