Three dimensional modelling of the behaviour of stone columns using the discrete element method
This paper presents a three dimensional simulation of model stone columns under triaxial conditions using the Discrete Element Method (DEM). In these simulations the interface between the clay and the stone column was modelled as a force-controlled particle boundary where normal stiffness at the interface was kept constant (Constant Normal Stiffness) prior to the column yielding. Particles of the column were modelled as clumps with the typical angularities seen in crushed basalt. Stress distributions at various points along the column were plotted and calibrated with previously published data. A parametric study was then undertaken to enable continuous observation of stress distribution and lateral deformation along the length of the column. Several simulations were carried out by varying the particle size distribution and morphology. It was found that particle size distribution and morphology influence the stress distributions within the column.