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<p>Bauxite extraction is often accomplished by blasting in open-pit mines leading to the fragmentation of the rock at a macroscopic level. To fully understand this phenomenon of dynamic damage and fragmentation, this paper deals with the validation of a two-scale damage model in tension behavior of dynamic microcracks growth based on the results of spalling Hopkinson bar test applied to Bauxite rock sample. The developed damage model implemented in a finite element code takes into account dynamic phenomena. Inertia is naturally taken into account in dynamic explicit/implicit FE code. Constitutive model needs to account for strain-rate sensitivity. It is shown that the model at macroscale is able to reproduce the obtained experimental results in terms of the location of failure plane and the particles velocity on the sample rear face. Numerical simulations of the bench blasting operation is carried out and the ability of the model to reproduce radial fractures zone due to orthoradial tensile stresses has been demonstrated.</p>

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A Two-Scale Model for Bauxite Damage and Fragmentation Under Dynamic Loading: Experimental Validation Through Hopkinson Bar Test

  • 期刊论文

  • 发表日期：

    2025年4月25日

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  • O. Keita,
  • Y. Camara

摘要

Bauxite extraction is often accomplished by blasting in open-pit mines leading to the fragmentation of the rock at a macroscopic level. To fully understand this phenomenon of dynamic damage and fragmentation, this paper deals with the validation of a two-scale damage model in tension behavior of dynamic microcracks growth based on the results of spalling Hopkinson bar test applied to Bauxite rock sample. The developed damage model implemented in a finite element code takes into account dynamic phenomena. Inertia is naturally taken into account in dynamic explicit/implicit FE code. Constitutive model needs to account for strain-rate sensitivity. It is shown that the model at macroscale is able to reproduce the obtained experimental results in terms of the location of failure plane and the particles velocity on the sample rear face. Numerical simulations of the bench blasting operation is carried out and the ability of the model to reproduce radial fractures zone due to orthoradial tensile stresses has been demonstrated.