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ANALYZING THE MACRO AND MICRO-SCALE RESPONSE OF AN IDEALISED GRANULAR MATERIAL IN DIRECT SHEAR TEST USING 3D-DEM SIMULATIONS AND EXPERIMENTAL INVESTIGATIONS
Session: Soil Mechanics II / Mécanique des sols II
Samaneh Amirpour Harehdasht, Civil Engineering, Université de Sherbrooke (Canada)
Mourad Karray, Professor, Department of Civil Engineering, Université de Sherbrooke (Canada)
Mahmoud N. Hussien, Post-doctoral fellow, Department of Civil Engineering, Université de Sherbrooke (Canada)
Varvara Roubtsova , Ph.D., Researcher, Institut de Recherche d'Hydro-Québec (Canada)
Mohamed Chekired, Ph.D., Researcher, Institut de Recherche d'Hydro-Québec (Canada)
This paper describes a promising virtual approach using SiGran (3D virtual laboratory for geotechnical applications) to observe the micro-scale behaviour of an idealized matrial in direct shear test, based on the descerete element methods (DEM). To validate the numerical simulations, a series of experimental tests were also carried out. The macro-scale results obtained from DEM simulations show good agreement with those of the laboratory tests. The micro scale results from numerical simulations also were derived showing the initiation of shear bands from the side boundaries toward the centre. When sample reached the peak state the distinct shear band along the middle plane developed and became more continuous and expansive during the post-peak. The micro scale results are in good agrrements with previoues study tried to evaluate the formation of shear band in two or three dimentional simulations.
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