Title
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Simulation of clay soil de-compaction by subsoiling process using discrete element method
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Author
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Abstract
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High pressures on the soil surface by action of heavy machinery and tillage process cause soil compaction and hardpan layers formation. De-compaction is a energy demanding operation applied to break deeply compacted soil for agricultural uses. Three dimensional simulations of soil decompaction are presented based on a soil-tool interaction model implemented in DEMeter software. Formulation of soil-soil and soil-tool interaction are combined into an elastic-plastic particle based model for soil deformation and evaluated in different tension states among soil particles; The macromechanical input parameters include: adhesion, friction, Young's modulus, Poisson's coefficient, elastic limit, plastic limit and soil density. Compression triaxial tests and shear box tests were carried out in order to obtain the required mechanical properties for a tropical clay soil. Simulations of unconfined compression tests using different particle sizes and inter-particle tension were used to calibrate the model to experimental stress-strain curves. The performance of complex tillage tools geometries is tested with 3D simulations and evaluated based on the reaction force on the tool as a function of time and displacement. The results show qualitative and quantitative adjusts of real patter of soil behaviour. |
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Language
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English
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Source (book)
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2nd International Conference on Particle-Based Methods : Fundamentals and Applications (Particles), October 26-28, 2011, Barcelona, Spain
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Publication
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Barcelona
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2011
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Volume/pages
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(2011)
, p. 596-607
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ISI
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000313628100057
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