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J. Pistrol, F. Falkner, D. Adam, C. Adam:
"Comparison of constitutive soil models for the simulation of dynamic roller compaction";
Talk: 6th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012), Wien; 2012-09-10 - 2012-09-14.

Realistic modeling of dynamic roller soil compaction requires the consideration of different nonlinearities. It is necessary to take into consideration that an appropriate contact formulation must be applied to model soil - roller interaction. Additionally, moving of the roller results in large rigid motions. Finally, a nonlinear constitutive law describes the roller induced soil compaction.
In the presented study two different rate-independent elasto-plastic constitutive laws for soil are evaluated and tested on their ability to reproduce natural soil behavior under the dynamic loading of roller compaction.
One of the constitutive laws is the Mohr-Coulomb criterion, where the evolution of plastic strains is modeled by means of a non associated flow rule. According to the smooth flow potential the volumetric plastic strain increases in case of yielding.
The second model tested is based on the Drucker-Prager yield surface to describe shear failure, however extended by a cap model to consider failure due to compaction. To each of both yield surfaces a different flow potential of elliptic shape is assigned to consider the evolution of the volumetric plastic strains appropriately, and thus, compaction in the numerical model leads to a volume decrease as it is observed on-site.

constitutive soil model, dynamic compaction, roller, soil dynamics