期刊
GRANULAR MATTER
卷 19, 期 2, 页码 -出版社
SPRINGER
DOI: 10.1007/s10035-017-0723-8
关键词
Granular material; Particle geometry; Discrete element method; Intermediate stress ratio; Critical state; Fabric evolution
资金
- Natural Science Foundation of China [51578499, 5161101441]
- National Key Research and Development Program of China [2016YFC0800204]
- National Key Basic Research Program of China [2015CB057801]
- Royal Academy of Engineering under the Research Exchanges with China and India Scheme
The behavior of granular materials is very complex in nature and depends on particle shape, stress path, fabric, density, particle size distribution, amongst others. This paper presents a study of the effect of particle geometry (aspect ratio) on the mechanical behaviour of granular materials using the discrete element method (DEM). This study discusses 3D DEM simulations of conventional triaxial and true triaxial tests. The numerical experiments employ samples with different particle aspect ratios and a unique particle size distribution (PSD). Test results show that both particle aspect ratio (AR) and intermediate stress ratio (b = (sigma'(2) - sigma'(3))/(sigma'(1) - sigma'(3))) affect the macro- and micro-scale responses. At the macro- scale, the shear strength decreases with an increase in both aspect ratio and intermediate stress ratio b values. At the micro-scale level, the fabric evolution is also affected by both AR and b. The results from DEM analyses qualitatively agree with available experimental data. The critical state behaviour and failure states are also discussed. It is observed that the position of the critical state loci in the compression (e - p') space is only slightly affected by aspect ratio (AR) while the critical stress ratio is dependent on both AR and b. It is also demonstrated that the influence of the aspect ratio and the intermediate stress can be captured by micro-scale fabric evolutions that can be well understood within the framework of existing critical state theories. It is also found that for a given stress path, a unique critical state fabric norm is dependent on the particle shape but is independent of critical state void ratio.
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