Abstract
In this study, we developed a soil model using the 3D Distinct Element Method and examined parameters used in the method. This was done by comparing results of simple examinations with their simulation results. First, we selected parameters by trial and error to show the experimental results and then changed the friction coefficient, particle size, and spring constant based on these parameters in order to examine them. The friction coefficient had a positive relation with soil deformation and reaction force, and the spring constant had a positive relation with only reaction force while particle size did not have a relation with them. In addition, the spring constant could be estimated using previously proposed equations. However, the friction coefficient can not be estimated using the internal friction angle. Digging experiments were conducted with a 20-cm wide soil bin and a 7.5-cm wide leg. Three dimensional particle movement could be expressed with the above parameters. Furthermore, this simulation could also express the reaction force which was reduced during digging due to three-dimensional particle movements.
