Physical modelling of low-energy dynamic compaction Available to Purchase

A physical modelling of low-energy dynamic compaction (DC) on fine, dry loose sand based on image processing (PIV method) was undertaken. Tamping was executed by rising and dropping semi-cylindrical steel tampers of known diameters and weights on the surface of sand deposit. The effective factors of DC and the deformation pattern of sand after tamper drops were investigated using the PIV method. The displacement field of soil mass was investigated. Strain elements were obtained from displacement patches in the ground. The changes in relative density due to impacts at different depths were evaluated using total volumetric strains. A normalized relation between the influence depth and DC parameters was presented for low-energy DC design. This relation may be used to predict the influence depth of improvement. By deriving crater depth versus drop number curves, the influence value of each impact on the increase of improvement depth was defined.