Influence of Damping Forms on the Behavior of Sand Under Dynamic Compaction

Based on Mohr-Coulomb theory, a centrifuge test of dry sand was simulated using FLAC3D. The local and Rayleigh damping were applied respectively to numerical model. The result shows that the ground settlement around tamping pit under local damping is smaller than that under Rayleigh damping. There is little difference between the maximum vertical stresses of the first impact under local damping and Rayleigh damping. The maximum vertical stresses both appear at 1-2 m depth under the tamping pit. However, the calculation efficiency under local damping is higher than that under Rayleigh damping. The dissipation of energy grows apparently as the depth of foundation is augmented. The study on the simulation of different damping forms in FLAC3D is helpful to further research about dynamic compaction.