National University of Sciences, Technologies, Engineering and Mathematics (UNSTIM), Abomey, Republic of Benin;
University of Abomey Calavi, Abomey Calavi, Republic of Benin;
Harbin institute of Technology, Harbin, China;
Deutsche Bahn, Hannover, Germany;
Grain; Size; Dependent; Stiffness; Experiment; Discrete; Element; Modelling; Triaxial; Compression; Test; Non-Cohesive; Soils; Materials;