Abstract

LOPEZ BRAVO, Elvis et al. Formulation of a frictional-cohesive soil model by the Discrete Element method. Rev Cie Téc Agr [online]. 2013, vol.22, n.3, pp.12-17. ISSN 2071-0054.

Friction and cohesion in efforts that take place during soil deformation calculations. Para interactions are considered normal force, tangential cohesive friction. The maximum shear is governed by the criterion of Mohr-Coulomb failure. Model calibration is performed by obtaining the relationship between micro and macroscopic parameters used in the model. The calibration of the friction was carried out by simulating the direct shear test of a sample of soil micro different friction coefficients. To calibrate cohesion used different values ​​of cohesion at the micro and the relationship was obtained by modifying the micro friction values ​​by simulating the biaxial compression test. The friction results showed a linear relationship regarding the variation of the micro value. Instead cohesion was linearly affected by the change inthe quadratic micro-cohesion and friction over micro.

Keywords : simulation; tillage; modeling; discrete element method; draft force.

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