Controlled Modulus Columns (CMC)

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?

CMC are formed by rotary techniques using an auger designed displace the soil laterally during installation.

They have undergone development by Menard Oceania in recent times and 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.


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