Microscale Energy Dissipation Mechanisms in Cyclically-Loaded Granular Soils |
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Authors: | Usama El Shamy Christina Denissen |
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Institution: | (1) Civil and Environmental Engineering Department, Southern Methodist University, P.O. Box 750340, Dallas, TX 75275, USA |
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Abstract: | This paper utilizes the Discrete Element Method to characterize energy dissipation mechanisms in cyclically loaded soils based
on micromechanical considerations. Computational simulations of consolidated undrained cyclic triaxial tests were conducted
at various relative densities and were subjected to cyclic loading of different frequencies and shear strain amplitudes. The
different components of microscale energies were monitored during the course of the simulations and characterized into input
and dissipated energies. A comparison is made between the dissipated energy computed from microscopic energy components and
macroscopic energy calculated based on the area of the deviator stress-axial strain loops. These energies are then used to
obtain the specific damping capacity defined as the ratio of dissipated energy during one cycle to the maximum stored elastic
energy during the same cycle. The conducted simulations highlight the importance of calculating actual stored energy in the
system as opposed to approximating it to be that calculated as the triangular area under the secant modulus. Finally, a series
of simulations that resulted in liquefaction are discussed, and the amount of energy dissipated to liquefaction is examined
based on these results. |
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