3D DEM Analysis of Interface Behavior Between Sand and Corrugated Surfaces

  • Grabowski, Aleksander (Gdańsk University of Technology)
  • Nitka, Michał (Gdańsk University of Technology)

Please login to view abstract download link

Bulk solid-structure interfaces commonly occur in a wide range of engineering constructions, e.g. foundations, geotextiles, tunnels and silos. They are an essential factor when it comes to the safety of engineering systems, particularly with respect to static and dynamic aspects of their mechanical behavior, which is affected by the properties of both the contacting granular material and opposing structure. The interface behavior is characterized by the formation of shear zones in the material region adjacent to the construction surface, which play a significant role in the estimation of the shear resistance, and as a result, the loads transferred from the granular material to the structure [1]. The research deals with the numerical investigations of the interface between sand and sinusoidal corrugated surface in the direct shear test under constant normal load. A series of interface shear tests with different sinusoidal corrugated surfaces were carried out with the discrete element method (DEM) under 3D conditions [2]. The numerical results were directly compared with our own laboratory tests. The focus was to quantify the effect of corrugation coefficient d/l on the evolution of the behavior of the shear zone on particle-level. Parameters, such as grain rotations and displacements or force chains between the granulates were investigated. It has been shown that the increase of the corrugation coefficient d/l induces the increase of the forces exerted on the surface and the volumetric changes. Furthermore, the corrugation coefficient affected the interface failure mechanism. Direct sliding of the material was observed for the smooth surfaces. In contrast, the shear plane was observed above the corrugation valleys, inside the material and at the corrugation peaks for the rough surfaces. The numerical results provide insight into the micro-behavior of the interface between the granular material and the sinusoidal corrugated surface and can help to better understand the functioning of engineering structures such as silos with corrugated sheet walls.