Overview
- Cost effective, fast and quantified ground improvement
- Uses 3, 4 and 5 sided and polygonal impact rollers
- Compact in situ mixed fill, landfills and low strength natural soil to depths up to 5m.
- Compact placed deep lifts of material up to 1.5m thickness.
Impact Rolling or High Energy Impact Compaction uses 3, 4 and 5 sided and polygonal impact rollers. As the non-circular roller rotates, it imparts energy to the soil as it falls to compact the ground.
Using Intelligent Compaction Measurement, we measure pass counts, ground response and settlement, giving full visibility and traceability of the in situ conditions.
Accelerated Compaction of In Situ Material
Impact rolling enables accelerated consolidation of in situ mixed fill, landfills and low strength natural soil to depths from 1m to 5m. Depths of compaction to 4m (clays) and 5m (sands with capping layer) can be achieved. Impact rolling is a cost-effective alternative to material removal (excavation) and replacement. It provides consistent, uniform compaction across heterogenous sites, for improved load bearing capacity allowing development to proceed on shallow footings, rather than on more expensive deep footings.
Compaction of Deeper Lifts of Placed Material
Compaction of deeper lifts of placed layers up to 1.5m depth makes impact rolling a very attractive alternative to traditional vibratory roller compaction where a maximum of say, 600mm, can be compacted. By increasing the layer thickness, the number of layers of material that are placed is reduced, increasing rates of construction and reducing construction costs. Larger grain sizes to 2/3rds of the layer thickness can be compacted.
Applications for Impact Rolling
Impact rolling applications include:
- civil infrastructure (residential subdivisions, airports, roads and ports)
- commercial and industrial (land development including problematic sites)
- mining (mine haul roads, tailings dams and mine rehabilitation)
- rubbilise sharp oversize rock on tip heads, pit floors and mine haul roads, resulting in significant savings on tyre wear and damage to mine haul trucks.
- liquification mitigation can be achieved because compaction rearranges soil particles into tighter configuration, increasing soil density. This increases the shear strength and liquification resistance of the soil, encouraging a dilative response instead of a contractive, dynamic soil response.
- permeability is reduced e.g. for capping layers in mine rehabilitation by reducing the voids present in the soil.
- renewable energy infrastructure (roads, lay-down areas, substation foundations)
- landfills (closed old landfill sites are treated with impact rolling to reduce creep settlement or increase stiffness without disturbing what’s underneath.
- land reclamation (dredged sands)
- contaminated sites (containing toxic or hazardous material such as Acid Sulphate Soils, PFAS (containment cells), Heavy Metals, Asbestos etc. with applications including containment dams, liquification mitigation, and acid mine drainage reduction.
- concrete or asphalt breakage for inground slabs and structures or pavement layers
- coal discard compaction to better control pollution and land instability
- agriculture water storage (floors and dam walls) and irrigation channel banks to reduce permeability (and seepage) and the likelihood of dam wall failure.
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Ten years of collaboration with the Adelaide University School of Civil, Environmental & Mining Engineering has formed the backbone of further developments in Rolling Dynamic Compaction, and the continued development of the Impact Roller design and application. More than 40 PhD students have contributed to this process with many published papers being presented at Australian and International Geomechanics Society conferences. A combination of field testing matched with finite element analysis in the laboratory have brought great advancements in the impact rolling product and knowledge of deep compaction.
