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Numerical study on screening of surface waves using a pair of softer backfilled trenches
Abstract Vibration screening effectiveness of a pair of in-filled trenches is numerically studied under conditions of plane strain using PLAXIS 2D in a linear elastic, isotropic, and homogeneous half-space acted upon by a steady-state vertical excitation. Barrier efficiency is analyzed in terms of reduction of vertical and horizontal vibration components with respect to the variations in barrier geometry and in-fill material parameters. The geometric features are normalized with respect to Rayleigh wavelength of vibration in soil. The in-fill trench material is considered to be softer and accordingly assigned lower shear wave velocities than the half-space. Non-dimensional design charts are developed and the key parameters participating in wave screening process are identified. Some recommendations are made regarding the optimal selection of these parameters. Comparison with a few published results shows close agreement. Such an isolation scheme may be advantageous in circumstances where a single trench requires unrealistic depth.
Highlights Investigates vibration screening effectiveness of dual in-filled (softer) trenches. Dimensionless charts are developed to study the effect of barrier features. Key parameters are identified and guidelines are made for their optimal selection. Current modelling approach is validated with some published results. Such an isolation scheme may be adopted as an alternative to a single trench.
Numerical study on screening of surface waves using a pair of softer backfilled trenches
Abstract Vibration screening effectiveness of a pair of in-filled trenches is numerically studied under conditions of plane strain using PLAXIS 2D in a linear elastic, isotropic, and homogeneous half-space acted upon by a steady-state vertical excitation. Barrier efficiency is analyzed in terms of reduction of vertical and horizontal vibration components with respect to the variations in barrier geometry and in-fill material parameters. The geometric features are normalized with respect to Rayleigh wavelength of vibration in soil. The in-fill trench material is considered to be softer and accordingly assigned lower shear wave velocities than the half-space. Non-dimensional design charts are developed and the key parameters participating in wave screening process are identified. Some recommendations are made regarding the optimal selection of these parameters. Comparison with a few published results shows close agreement. Such an isolation scheme may be advantageous in circumstances where a single trench requires unrealistic depth.
Highlights Investigates vibration screening effectiveness of dual in-filled (softer) trenches. Dimensionless charts are developed to study the effect of barrier features. Key parameters are identified and guidelines are made for their optimal selection. Current modelling approach is validated with some published results. Such an isolation scheme may be adopted as an alternative to a single trench.
Numerical study on screening of surface waves using a pair of softer backfilled trenches
Saikia, Ankurjyoti (author)
Soil Dynamics and Earthquake Engineering ; 65 ; 206-213
2014-05-30
8 pages
Article (Journal)
Electronic Resource
English
Numerical study on screening of surface waves using a pair of softer backfilled trenches
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