Compaction grouting is a ground improvement/reinforcing technique where a specific volume of grout is placed at discrete intervals in the ground to provide a known displacement of granular soil or reinforce soft, fine-grained soil. The technique is also commonly used to stabilize sinkholes and other voids/cavities in the subsurface. A small diameter steel casing (typically less than 6-in diameter) is advanced to the lowest level of the zone of improvement. A low-slump grout is pumped at high pressure to place a pre-determined volume of grout to provide a design displacement of the in-place soils. The casing is then raised at specific increments with grout injected at each increment. The result is a column of grout through the improvement zone. This is repeated at planned injection points across a project site. Berkel has also developed an augered compaction grouting process for sites with very deep compaction grouting requirements. Compaction grouting can increase allowable bearing pressure and decrease settlement for shallow foundations and mitigate liquefaction potential.
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