Resumo

LOPEZ-BRAVO, Elvis et al. Simulation of Clay Soil De-Compaction Using Discrete Element Method. Rev Cie Téc Agr [online]. 2019, vol.28, n.2, e01. ISSN 2071-0054.

Draft force prediction and soil mechanical behavior during soil de-compaction was implemented by using the Discrete Element Method. The model parameters were defined as a function of the mechanical properties a clay soil, previously obtained by laboratory tests. The properties used by the model are cohesion, adhesion, internal friction, external friction, Young’s modulus and Poisson’s coefficient. The effect of the subsoiler shape variation was simulated under dry-compacted soil conditions, showing clear variations in forces related with the tool geometry. Increasing in complexity of the tool geometry the simulation, the model showed advantages in terms of demanded pressure and volume of soil disrupted. The soil de-compaction with hardpan formation was also simulated by introducing two different compacted soil sections in the virtual block. The compaction level was defined by two set of micro-particles with different density resulting from modifying the soil dry bulk density at the model macro-parameter. The simulation shows the feasibility of modelling separately the forces demanded for the different part of the tillage tool and the soil particle pattern of movement during the operation.

Palavras-chave : Tillage; prediction; friction; compaction; implement.

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