Abstract
The results presented in this paper are about the experimental and numerical studies of the trap-door problem in three dimensions with rectangular trap-door. Artificial materials (glass beads) were used in the experimental tests. The mechanisms were investigated with CT scanning and with numerical analysis using Discrete Element Method (DEM). DEM modeling was carried out on several particle size distributions. One of the samples presented the same characteristics as for the experimental tests (same particle shapes and size distributions). The friction parameters of the contact laws used in DEM analysis were determined by comparison of real triaxial compression tests with numerical modeling of triaxial tests. As the trap-door was moved downward, the response of the granular layers broke down into 2 main phases according to the amplitude of the trap-door displacement. The agreement between numerical and experimental results was satisfying. The mechanisms were described with regard to the shape of the failure zone and also from the strain field point of view. The effect of the particle size on the amplitude of load transfers and on shape of failure zone was observed.
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