A numerical study based on GBM3D-DEM model: Multi-level force chain analysis in dynamic flexural tensile strength test

Abstract

The force chain network is the key information of rock materials under loading, which is close to the micro-scale cracking and macroscopic mechanical behavior of rocks. In this paper, a novel 3D grain-based model based on the discrete element method (GBM3D-DEM) is proposed to reproduce the heterogeneous structure of granites, and the dynamic flexural tensile strength test is simulated by the coupled (finite difference method (FDM)-DEM) split Hopkinson pressure bar (SHPB) numerical system. The results show that the value and the number of all general force chains (GF) inside the sample during the loading process indicate the stress level and cracking activity of the sample respectively. The number of high-strength force chains (HF), defined as those with values greater than the average value of all GF at peak load moment, can deeper characterize the stress level applied on both ends of the sample. Also, the main orientation distribution of HF is consistent with the loading direction and is perpendicular to that of cracks. In general, the force chain network is multi-level classified and the cracking activity and mechanical behavior of granite has been investigated from a microscopic perspective. The loading rate effect is also analyzed from the multi-level force chain network perspective.

Keywords

rock mechanics / 3D grain-based model / coupled SHPB system / multi-level force chain network / loading rate effect

References

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