Rigid Inclusions is a ground improvement technique that transfers loads through weak strata to a firm underlying stratum, using high modulus concrete columns. A closed-end mandrel is advanced to the underlying firm soils. The pipe is then filled with a concrete mix with a high internal friction. The end of the mandrel is opened and the mandrel is extracted. The concrete fills the void created by the mandrel during extraction, and terminates in an upper strong stratum or is subsequently overlain by a fill relieving platform. The improved performance results from the reinforcement of the compressible strata with the high modulus columns. The technique has been used to increase allowable bearing pressure and decrease settlement for planned structures, embankments and tanks.
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