Numerical Modeling of Lateral Dynamic Compaction on the Slope in Dry Sand

Abstract

Dynamic compaction is a low-cost soil improvement method that is most commonly applied in sandy soils. Free fall compaction is not applicable to compact the soil in the slope, but it is possible to perform lateral dynamic compaction in the slope. In this method, the angle of impact of the tamper with the inclined surface is vertical. In this dynamic compaction method, the tamper is forced to move in a circular path by a cable with specific radius. In this study, ABACUS 6.14 software was used to simulate three-dimensional model of lateral dynamic compaction in the slope. The critical state model that used in numerical simulation is cap plasticity criteria. In this study, the effects of impact position, impact velocity and tamper weight on soil improvement for three different slope were investigated. The analysis focuses on crater depth and improvement region which are compared to the state of flat ground. It was found that on steep slopes to increase the tamper energy, the effect of increasing the impact velocity was greater than the effect of increasing the tamper mass to soil improvement. The crater depth due to lateral dynamic compaction is lower than the horizontal layer as well as the depth of soil improvement.