Rigid Inclusions

Using high deformation modulus columns to reduce settlement and increase the bearing capacity of the existing ground, rigid inclusions are suitable for weak, compressible soils.

Installed using an auger displacement tool to ensure there is minimal spoil generated, the columns are typically up to 350mm in diameter and are made of a low strength concrete and are unreinforced.

This ground improvement solution works alongside a load distribution mattress which allows for a traditional sub-structure design such as pad foundations, strip footings and ground bearing floor slabs.

Rigid inclusions being installed by Van Elle.

What are the advantages of Rigid Inclusions?

  • Increased bearing capacity
  • Improved settlement performance
  • Significant savings over piling
  • Bearing capacities of up to 250kN/m2 achievable
  • Up to 350mm diameter columns installed
  • No pile caps / cropping required
  • Installed to depths of up to 20m
  • Displacement system – minimal spoil
  • Modern fleet of rigid inclusion rigs – fully instrumented
  • Fast process – suitable for any size site
  • Improved ground allows the use of ground bearing floor slabs for further cost savings
  • Fully validated by load testing

Common Uses

Rigid inclusions are a ground improvement technique that improves settlement performance, increasing load-carrying capacity and reducing compressibility of the poor soils.

They are ideally suited for warehouses, industrial and commercial sheds, embankment support for infrastructure and in some cases residential properties.

Van Elle installing Rigid Inclusions using a dedicated rig

Rigid Inclusions begin with the set up of a displacement auger over position and the commencement of drilling to design depth.

Concrete or grout is pumped from a concrete drum through the centre of the auger while it is extracted.


Van Elle Rigid Inclusions illustration
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