Rapid Impact Compaction (RIC)

Rapid Impact Compaction (RIC) is a ground densification technique whereby loose soils can be effectively and economically densified to improve its mechanical characteristics and allow construction of different types of structures.

Rapid Impact Compaction (RIC) technique is derived from Dynamic Compaction (DC) method for the compaction of the shallow improvement depth. Compaction using the RIC technique takes place from the top surface of the soil. The RIC machine consists of a hydraulic excavator base with a strengthened arm to which a compaction hammer is attached. The hammer weight generates compression by the repeated drop onto a compaction foot that remains in contact with the ground. This compaction energy brings the soil particles into a more densely packed structure. The compaction of the sub-soil is initiated by the energy generated by the impact of the weight upon the foot, and by the movement of the foot into the ground pushing the material into a denser structure.

Furthermore, the dense compaction pattern with overlapping influence zones guarantees homogeneous compaction.

This ground improvement method is generally suitable for granular geomaterials, including gravel, sands, silts, uncontrolled fills (i.e., a mixture of sand, silt, and clay) with very limitation for high fine content.

Rapid impact compaction (RIC) has been applied to increase bearing capacity, limit the settlements up to 4-5m

RIC is widely used for site preparation as alternative for conventional method by filling in bulk and compacting 4m lifts. In addition, being a soil improvement method, RIC can be applied for foundations, floor slabs, tanks, highways, railways, parking lots, and airport runways.

The production of rapid impact compaction (RIC) is fast and under a much- controlled manner as compared with deep dynamic compaction. It induces small vibrations and can be used up to 15m distance from adjacent structures. therefore, it can be operated at closer distances to existing structures.

The key limitation for this technology is that the depth of improvement is smaller than that of deep dynamic compaction.