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Geological Society, London, Special Publications; 1996; v. 99; p. 235-250;
DOI: 10.1144/GSL.SP.1996.099.01.18
© 1996 Geological Society of London

Mathematical Modelling

Finite element modelling of the competition between shear bands in the early stages of thrusting: Strain localization analysis and constitutive law influence

J. D. Barnichon & R. Charlier

Département MSM, Université de Liège, 6 Quai Banning, 4000 Liège Belgium

Finite element simulation of a sandbox model of thrusting is performed using large strain analysis and two different non-associated elastoplastic constitutive laws (namely Drücker-Prager and Van Eekelen criteria). The analysis of strain localization using the Rice bifurcation criterion coupled with a kinematic indicator shows that, in the early stages of imbricated thrusting, the development of major shear bands can be influenced by some competition with second order bands. The influence of the vertical/horizontal stress ratio is checked, as well as the influence of Lode angle in the constitutive law. Significant differences are found between a classical plasticity criterion (Drücker-Prager) and a more realistic one (Van Eekelen) regarding the resistance of the model and the stress paths. These differences may result in erroneous fault type prediction.