Feasible packing of granular materials in discrete-element modelling of cone-penetration testing

N. Ecemis, P. Bakunowicz
Taylor & Francis
Geomechanics and Geoengineering: An International Journal
cone penetration test, Coordination number, Discrete element modelling, Granular material, Porosity, Triaxial Test
This paper explores how the discreteelement method (DEM) was found to play an increasingly important role in cone penetration test (CPT) where continuum-mechanics-based analysis tools are insufficient. We investigated several crucial features of CPT simulations in the two-dimensional DEM. First, the microparameters (stiffness and friction) of discrete material tailored to mimic clean, saturated sand, which is used in cone-penetration tests, were calibrated by curve-fitting drained triaxial tests. Then, three series of cone-penetration simulations were conducted to explore (1) top boundary conditions, (2) reasonable size of discrete particles at different initial porosities, and (3) limit initial porosity of the model for a balance between accurate representation and computational efficiency. Further, we compared the cone-penetration resistance obtained in the laboratory and numerical simulations for the range of relative densities.
Keywords: Cone-penetration test, discrete-element modelling, granular material, triaxial test, porosity, coordination number

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