Analysis of wave propagation in dry granular soils using DEM simulations |
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| Authors: | Natasha Zamani Usama El Shamy |
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| Institution: | (1) Department of Civil and Environmental Engineering, Southern Methodist University, Dallas, TX 75205, USA; |
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| Abstract: | In this paper, a three-dimensional particle-based technique utilizing the discrete element method (DEM) is proposed to study
wave propagation in a dry granular soil column. Computational simulations were conducted to investigate the soil response
to sinusoidal motions with different amplitudes and frequencies. Three types of soil deposits with different void ratios were
employed in these simulations. Different boundary conditions at the base such as rigid bedrock, elastic bedrock, and infinite
medium were also considered. Analysis is done in time domain while taking into account the effects of soil nonlinear behavior.
The computational approach is able to capture a number of essential characteristics of wave propagation including motion amplification
and resonance. Dynamic soil properties were then extracted from conducted simulations and used to predict the response of
the soil using the widely used equivalent linear method program SHAKE and compare its predictions to DEM results. Generally,
there was a good agreement between SHAKE and DEM results except when the exciting frequency was close to the resonance frequency
of the deposit where significant discrepancy in computed shear strains between SHAKE predictions and DEM results was observed. |
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