Techniques

Slurry Walls

Slurry walls can be excavated under a self setting cement bentonite slurry or in a two phase approach with excavation under bentonite with subsequent backfilling using a soil and bentonite slurry.
Extremely low permeability walls can be excavated using backhoe excavators to depths in excess of 20m with deeper walls constructed using grabs.

Slurry walls are non structural and are typically installed to limit groundwater flow for temporary to enable excavation or permanent cases or provide containment of waste sites.