Journal
COMPUTERS AND GEOTECHNICS
Volume 106, Issue -, Pages 161-176Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compgeo.2018.10.021
Keywords
Sand-fines mixtures; Residual shear strength; Particle shape; Fines content; Contact type; Anisotropy
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Funding
- National Natural Science Foundation of China, China [51809292, 51478481]
- Postdoctoral Fund of Central South University, China [205455]
- Beijing Municipal Science and Technology Project: Research and Application of Design and Construction Technology of Railway Engineering Traveling the Rift Valley, China [Z181100003918005]
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This report explores the effects of particle shape and content of fines on the shear behavior of sand-fines mixtures using a two-dimensional discrete element method. The contributions of different contact types to the residual shear strength are quantified. Microscopic analysis of each contact type, including coordination number, normal contact force and their contributions to the principal stress components, reveals why the contribution of each contact type to the residual shear strength is varied. Finally, anisotropic analysis enables us to understand the microscopic mechanisms that cause the residual shear strength to be dependent on the particle shape and content of fines.
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