CUED Publications database

Surface wave propagation from drop-projectile tests: Physical and numerical modelling

Kumar, V and Madabhushi, SPG (2020) Surface wave propagation from drop-projectile tests: Physical and numerical modelling. In: UNSPECIFIED pp. 4710-4721..

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Surface wave propagation can be investigated with the help of centrifuge and numerical modelling. An electromagnetic drop-projectile apparatus was used to generate surface waves in soil upon the impact of a spherical metal ball with a shallow foundation. A 3D LS-DYNA FE model was developed and first calibrated against the analytical solutions for the soil displacement at the ground surface due to the arrival of Rayleigh waves. The 3D model was then validated with the results of vertical acceleration obtained from geotechnical centrifuge test for homogeneous soil layer profile. The numerical results show that LS-DYNA can reliably be used as a numerical tool to simulate surface wave propagation. Following the validation, a parametric numerical study was performed to assess the impact of stiffness contrast in soil layers on surface wave propagation. In this parametric study, soil layer with relatively lower stiffness (shear wave velocity) was modelled below a stiffer upper layer. The attenuation of vertical acceleration of the surface waves at an increasing distance away from the source were investigated and compared between the results of geotechnical centrifuge test and numerical models. The results of parametric analysis tend to suggest that the presence of soft soil at shallow depth can amplify the amplitude of vertical accelerations within the stiffer upper layer. This effect however is likely to be localised near the source of vibration.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div D > Geotechnical and Environmental
Depositing User: Unnamed user with email
Date Deposited: 15 Jan 2021 21:45
Last Modified: 09 Sep 2021 02:03