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Erschienen in:
2018 | OriginalPaper | Buchkapitel
A Numerical Study of the Fabric Anisotropy Effect on the Phase Transformation Behavior of Granular Soil
verfasst von : Bei-Bing Dai, Ai-Guo Li, Kai Xu
Erschienen in: Proceedings of GeoShanghai 2018 International Conference: Fundamentals of Soil Behaviours
Verlag: Springer Singapore
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Abstract
This paper describes an investigation into the effect of fabric anisotropy on the phase transformation (PT) behavior of granular soil by a DEM (discrete element method) analysis. The results indicate that the PT behavior of granular soil depends on fabric anisotropy created in the particle deposition process. As the deviation of principal anisotropy direction of soil fabric from the loading direction escalates, the mean effective and deviatoric stresses decrease, with the PT behavior being more easily developed. At a microscopic level, fabric anisotropy relating to both contact and particle orientations is found not to be a suitable micromechanical indicator of macroscopic PT behavior, while the occurrence of PT behavior is accompanied by the emergence of local minimum coordination number (or mean contact normal force). Furthermore, the PT line in e
c
– log pʹ plane is revealed to be non-unique, and fabric anisotropy is a fundamental factor affecting the position of PT line in e
c
– log pʹ plane.