CMC Rigid Inclusions

Controlled Modulus Columns (CMC) are installed as rigid inclusions in the soil for the purpose of enhancing the global modulus of otherwise incompetent soil. CMC are installed in a grid pattern to accommodate the imposition of large dead or live loads and contain settlements within acceptable limits.

Why do we use them?

  • To provide a cost effective soil improvement.
  • To maximise the benefits of the rotary displacement method.
  • To minimise of differential settlement and control, by design of total settlement.

How does it work?

CMCs are formed by rotary techniques using an auger designed displace the soil laterally during installation. They look like piles, but they are not:  they represent a significant refinement of the traditional displacement pile, with the outcome that CMC have achieved the optimisation of the rotary displacement technique.


  • An economic means of improving the shear strength and moduli of the in-situ soils.
  • Provide uniform support to slabs on grade, reducing slab thicknesses and reinforcement quantities.
  • Virtually no spoil disposal required, which is particularly beneficial for installation in contaminated soils.
  • Well suited to high surface loading conditions and strict settlement criteria.


CMC can be applied to various soil conditions. The technology works well in loose sands, soft loams, organic soils and anthropogenic soils (uncompacted fills, heaps).

The beauty of this technique is that it can be used for various applications: from infrastructure to all types of buildings including warehouses, or even wind farms, tanks… CMC Rigid Inclusions can work for all of them.

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