Multiscale approaches to describe mechanical responses induced by particle removal in granular materials

作者：Scholtes Luc^*; Hicher Pierre Yves; Sibille Luc

来源：Comptes Rendus Mecanique, 2010, 338(10-11): 627-638.

DOI：10.1016/j.crme.2010.10.003

• Granular media
• Micromechanics
• Erosion
• Failure

A multi-scale approach is proposed as an attempt to assess internal erosion induced effects on the mechanical properties of a granular medium. When submitted to internal flow, some particles tend to be removed from the initial granular material, leading to drastic changes in the microstructure. The medium is changing during its lifetime and this cannot be ignored in attempts to model its mechanical behavior. In this first analysis, the degradation of a granular assembly is simulated through the progressive removal of its finest particles for both isotropic and anisotropic stress states. A discrete element model as well as an analytical micromechanical model are used to compare induced deformations and properties changes along the erosion process. The shear strength and flow properties appear to be strongly modified by this extraction phase: both models highlight a change from a dilatant to a contractant behavior with the degradation as well as strong dependency of the overall stability on the mobilized friction level. In particular, results show how failure is triggered when particle removal occurs for mobilized frictions greater than the one reached at the critical state.

• 出版日期2010-11
• 单位CSIRO