DEMによる密度・過圧密履歴が異なる粒状材料の変形・破壊挙動と内部構造の変化の解析

抄録

Granular material shows non-linear deformation behaviors depending on density and over-consolidation histories. The evolution and collapse of microstructures formed in granular material control the macro behaviors. In this paper, the density and over-consolidation dependencies of deformation-failure behaviors were calculated by DEM in two-dimensional test. The geometric parameters such as fabric tensor described for stress-induced anisotropy and coordinate number, evolutions of stable microstructures and mobilization of rotation resistance around particles, were investigated. On the basis of analysis results, it was revealed that the collapse of stable structure during macro deformation induced the macro failure and the dependencies of density and over-consolidation were controlled by the mobilization of rotation resistance due to particle shape effects.