Trials And Validation Of Deep Compaction Using The “Square” Impact Roller

The use of non-circular impact modules for compaction, known as impact rolling, impact compaction or rolling dynamic compaction, has been gaining currency for a wide range of earthworks projects. Impact rolling has been shown to deliver significant improvements in soil strength or density to depths far exceeding conventional circular drum rollers. Now accepted in the Australian Standard for earthworks, and with documented experiences of impact roller performance, the technique can be considered for projects as varied as deep reclamation, major embankments and improving existing fill. In many cases, particularly with larger projects, a concerted trial programme delivers dividends in the form of confidence in the use of the technology, the most efficient methods for a particular application and the fact that the specification can be met in the most efficient manner. As much as trials are co-ordinated and controlled, so must the production work have an appropriate level of control and monitoring to ensure that the impact rollers are correctly utilised. This paper outlines several case examples where expenditure on detailed trials resulted in efficient impact rolling during productive earthworks.