Finite Element Modeling of Rate-Dependent Ratcheting in Granular Materials

The present paper introduces a comprehensive model capable of describing the behavior of granular materials under cyclic loading. Its main thrust is the introduction of the “Chicago” law in a continuum approach to account for the ratcheting effects. It also emphasizes the rate-dependency as a dissipative mechanism which acts independently or jointly with the ratcheting effect. Non-associated plasticity is adopted since the paper mainly targets the long term response of granular materials that are widely encountered in railway tracks and pavements. The numerical procedure is based on the return mapping algorithm where Newton’s method is used to calculate the non-linear consistency parameter of the flow rule and obtain the consistent tangent modulus. The model was validated using numerical examples including multi-axial, and cyclic loading conditions. Preprint submitted to Elsevier 3 January 2010 *Manuscript Click here to view linked References ha l-0 06 68 32 6, v er si on 1 9 Fe b 20 12 Author manuscript, published in "Computers and Geotechnics 38 (2011) 105-112" DOI : 10.1016/j.compgeo.2010.08.012