Investigating Effects of Particle Scaling for Cavity Expansion Simulation Using Discrete Element Method

摘要: The Discrete Element Method (DEM) has been widely adopted in investigating many complex geotechnical related problems due to its capabilities of incorporating the discontinuous nature granular materials. DEM can be very effective when simulating soil encountering large deformation or distortion (e.g. cavity expansion) since other numerical solutions may experience convergence problems. Cavity expansion theory widespread applications engineering, particularly concerning in-situ testing, pile installation, underground excavation, deep foundations, name a few, explaining why simulation using is worthy conducted. Although discrete element studies have carried out investigate associated with materials, there are limited findings reported regarding effects particle size scaling. Therefore, this study, series three-dimensional models different scaling factors developed PFC3D software, based on DEM. It should noted that model calibrated for medium sandy adopting experimental results obtained from triaxial test drained condition. To examine particle-scaling during expansion, several cylindrical cavities were created and expanded gradually an initial radius final radius, while stress variations, volumetric changes, as well radial movements gauge particles monitored entire simulation. Furthermore, internal was loaded constant strain rate, outer boundary automatically controlled through servo mechanism maintain external pressure appropriate subroutines. stress-strain responses displacement simulations discussed compared. observed factor beyond certain limit affect response expansion.