Abstract
The 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.
Highlights
There is an increasing need for civil engineers to provide costeffective solutions for construction on marginal or difficult sites
For a towing speed of 10·5 km/h for the 8 t four-sided impact roller, the effective depth of improvement (EDI) was estimated to be 0·73 m for clay soils (n = 0·3) and 1·94 m for granular soils (n = 0·8)
A relationship to evaluate EDI is presented as a function of the energy imparted to the ground by rolling dynamic compaction (RDC), which is appropriate for determining the depths to which ground can be improved in situ
Summary
There is an increasing need for civil engineers to provide costeffective solutions for construction on marginal or difficult sites. Published case studies involving standard four-sided impact rollers that have improved the ground in situ and have compacted soil in thick layers are summarised in Tables 1 and 2, respectively. In addition to the referenced published articles, the authors reviewed dozens of unpublished reports on the use of a four-sided 8 t roller in a variety of soil conditions. Their findings are in general agreement with the improvement depths and layer thicknesses summarised in Tables 1 and 2, respectively. It is evident that the thickness of compacted layers is less than the depth of improvement in the same soil type, as the compacted layer thickness is typically tailored to meet a target specification
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