Abstract
An alternative to the use of continuous equations and constitutive
models is the microscopic description of the material in terms of the
grains themselves and the contacts (interactions) between them. This
approach has been successfully applied in recent years to the study of
many different problems in soil mechanics and granular physics. An open
question is how realistic the microscopic model must be in order to
accurately describe the macroscopic behavior observed in experiments.
The objective of this contribution is to show the influence of different
simple models of compacted granular soils on the overall elasto-plastic
response of the system as a whole. We will focus our investigation on
granular ratcheting, which is the persistent strain accumulation that a
granular soil suffers under certain cyclic stress conditions. The direct
influence of different models on the ratcheting response of the material
will also help us to understand further this peculiar behavior of the
system. The influence of particle shape will be also discussed.
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