Numerical Modeling of Dynamic Compaction in Cohesive Soils

In this paper, the finite element code ABAQUS was used together with Cam-Clay constitutive model for clays in order to achieve a better understanding of the behavior of cohesive soils under dynamic compaction (impact from a falling heavy mass). The finite element simulation techniques for modeling impact of falling weight on the ground surface and the numerical techniques for properly accounting for infinite boundaries in a half-space are described in the paper. The validity of the finite element modeling technique was provided by matching predictions with some of known empirical rules from observations and field measurements. Using the verified finite element model, a comprehensive parametric study was conducted, from which practical findings have been obtained concerning the depth of improvement as related to impact energy, as well as the densification contours as influenced by impact energy and soil properties. The horizontal extent of densification due to impact was also delineated through finite element simulations. This paper contributes to enhancing existing knowledge of dynamic compaction in cohesive soils through a detailed FE simulation study.