Rigid inclusions, often referred to as controlled modulus columns, are a ground improvement solution used to enhance weak or compressible soils without relying on traditional deep foundations. They usually consist of low-slump concrete columns installed by displacement methods, within the soil to transfer load to more competent strata at depth.
Basic Technique
Unlike conventional piles, rigid inclusions are designed to work in combination with the surrounding ground. The applied load is shared between the column, and the improved soil matrix, typically through a load transfer platform, allowing settlement to be controlled in a predictable and efficient manner.
They are particularly well suited to industrial slabs, warehouses, embankments, and large building footprints where settlement criteria are critical, but full piling solutions may not be necessary.
Engineers specify rigid inclusions where a balance is required between performance, programme, and cost, delivering a robust foundation solution with minimal spoil and reduced installation disturbance.
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