Journal
ACTA GEOTECHNICA
Volume 17, Issue 7, Pages 2735-2750Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11440-021-01371-x
Keywords
DEM; Granular materials; Inter-particle friction; Lode angle; Strong and weak sub-network; True triaxial tests
Categories
Funding
- National Natural Science Foundation of China [51909194, 51825905]
- Science project of China Huaneng Group Co., Ltd. [HNKJ18H26]
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Inter-particle friction is crucial for the mechanical behavior of granular materials, particularly under 3D non-axisymmetric loading conditions. The multiscale effects of inter-particle friction play a complex role in determining the behavior of granular materials. The evolution of strong contact network is found to be consistent with the overall stress tensor, regardless of the friction coefficient.
The inter-particle friction is mainly related to the roughness of particles, which plays an important role in both macroscopic and microscopic mechanical behaviors of granular materials. Under the real three-dimensional (3D) loads, the multiscale effects of inter-particle friction could be more complex. In this study, a series of true triaxial tests are conducted based on discrete element method (DEM). We identify that the inter-particle friction is key to triggering the disaccord of Lode angles between stress tensor and incremental strain tensor (also fabric tensor) on pi-plane under 3D non-axisymmetric loading paths. A kind of function form is proposed to describe this disaccord, by incorporating the inter-particle friction coefficient mu and intermediate principal stress ratio b. We further observe that the evolution of strong contact network coincides with the overall stress tensor in the Lode coordinator system, irrespective of mu. The disaccord behaviors of overall contact fabric and the macroscopic stress mainly originate from the weak subset of contacts, and then, the inter-particle friction should play an important role on the rearrangements of weak contact network and finally lead to the disaccord behaviors at the macroscopic scale.
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