Abstract

FARIAS, Márcio Muniz de; GIRALDO-ZULUAGA, Robinson Andrés  and  NAKAI, Teruo. A new hardening rule to model the effect of density on soil behavior. Dyna rev.fac.nac.minas [online]. 2016, vol.83, n.197, pp.58-67. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v83n197.47010.

The authors propose a new hardening rule for constitutive models based on the subloading concept. This concept allows a smooth transition between unloading and reloading. Most importantly it characterizes the soil with a single set of parameters regardless of its initial density state. The new rule aims to improve the original model proposed by the last author. The original version included a linear evolution rule for the sake of simplicity, but did not include any empirical evidence for such law. This new version proposes an exponential law that provides a better fit to the experimental data. This law requires only two parameters with a clear physical interpretation. These parameters can be obtained from simple one-dimensional compression tests. The model was based on controlled tests performed with glass spheres, but was applied to real granular and clay soils. The results show that the model can very successfully reproduce the behavior of real soils.

Keywords : yield condition; constitutive relations; elastic-plastic material; laboratory tests.

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