CompactionGrouting

PRE-CONSTRUCTION PIERS, SINKHOLE REPAIR,SOIL & STRUCTURAL STABILIZATION

CompactionGrouting

Applications for SpecializedCompaction Grouting

• Mitigate seismic risks such as liquefaction, seismic settlement,

and lateral spreading

• Cut-off groundwater flows underneath or around dams or similar

structures

• Create water tight blocks for new excavations and tunnels

• Two all-thread bolts

• Seal leaks from within existing tunnels and excavations

Compaction grouting can be accomplished where access is difficult and space is limited. Since compaction grouting’s effective- ness is independent of structural connections, the technique is readily adaptable to existing foundations.

Compaction grouting improves ground conditions by displacement. A very viscous (low-mobility), aggregate grout is pumped in stages to displace and densify the surrounding soils. By sequencing the grouting work from primary to secondary to tertiary locations, this densification process can be performed to achieve significant improvement.

A small diameter steel pipe is installed to the lowest level of the target improvement zone. A low-slump grout is placed to a pre-determined pressure or volume of grout. The casing is then raised at specific increments with the grout placed to the same pressure/volume 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.

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