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It has recently been shown (Arroyo et al. ) that 3D DEM models are able to reproduce
with reasonable accuracy the macroscopic response of CPT performed in calibration chambers
filled with sand. However, the cost of each simulation is an important factor. Hence, to
achieve manageable simulation times the discrete material representing the sand was scaled up to
sizes that were more typical of gravel than sand. A side effect of the scaled-up discrete material
size employed in the model was an increased fluctuation of the macro-response that can be filtered
away to observe a macroscopic steady-state cone resistance. That observation is the starting
point of this communication, where a series of simulations in which the size ratio between
penetrometer and particles is varied are systematically analyzed. A micromechanical analysis of
the penetrometer–particle interaction is performed. These curves reveal that a steady state is arrived
also at the particle–cone contact level. The properties of this dynamic interface are independent
of the initial density of the granular material.
CitationButlanska, J.; Arroyo, M.; Gens, A. Steady state of solid-grain interfaces during simulated CPT. "Studia Geotechnica et Mechanica", 2013, vol. XXXV, núm. 4, p. 13-22.
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