Scott, B.T.Jaksa, M.Mitchell, P.W.2025-07-282025-07-282021Proceedings of the Institution of Civil Engineers: Ground Improvement, 2021; 174(2):85-941755-07501755-0750https://hdl.handle.net/2440/146333The depth of influence of rolling dynamic compaction (RDC) was investigated in a field trial using a four-sided impact roller. Earth pressure cells (EPCs) were placed at varying depths at a site consisting of homogeneous soil conditions. EPCs measured pressures imparted by RDC at 3·85 m depth; however, the largest magnitudes of pressure were confined to the top 2 m beneath the ground surface. These results were complemented by field density data, penetrometer and geophysical testing. A number of published case studies using the 8 t four-sided impact roller, for either improving ground in situ or compacting soil in thick layers, are summarised in this paper. Finally, equations are presented that predict first, the effective depth of improvement, appropriate for determining the depth to which the ground can be significantly improved in situ, and, second, the depth of major improvement for RDC, appropriate for thick-layer compaction.enPublished with permission by the ICE under the CC-BY 4.0 license. (http://creativecommons.org/licenses/by/4.0/). This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.design methods & aids; field testing & monitoring; geotechnical engineeringJournal article10.1680/jgrim.18.00117481707Scott, B.T. [0000-0001-5409-7678]Jaksa, M. [0000-0003-3756-2915]