DEM investigation of sand response during displacement pile installation

Previous experimental and numerical studies indicate that the stress state of sand at a specific depth changes significantly during installation displacement pile. At given level, horizontal in increases as end pile approaches reduces continues to penetrate go past element. This reversal, together with large-strain deformation shaft, may cause reduced accuracy calculation capacity. In this paper, micro-mechanical behaviour developed around shaft closed-ended was studied using two-dimensional Discrete Element Method (DEM). Sand assembly modelled uncrushable discs, rigid clump which made large number overlapped discs fixed distance. The responses terms stress, strain volume monotonic jacking were investigated. Simulation results revealed behaviours both interface zone “B” adjacent far field “A” away from It shown along small normalised distance tip subjected reduction goes past. As drives deeper, larger exhibited dilation. captured process will give insights degradation friction horizon.