Slurry walls are constructed using a bentonite or cement-bentonite slurry to stabilise the trench during excavation. Whether cut-off or structural walls, Keller can provide the optimal design and/or construct solution for your below-ground wall needs.
- Create barriers to groundwater flow
For traditional barrier walls, the trench is excavated through bentonite slurry or cement-bentonite (CB) slurry to prevent collapse during excavation. For CB walls, the CB hardens in the trench to form the wall. When bentonite slurry is used alone, the excavated soil is typically mixed with bentonite and then placed back into the trench to form a soil-bentonite wall.
The walls can be excavated using back-hoe excavator, clam-shell grabs or even hydromills. The finished wall creates a groundwater barrier with low permeability.
Non-traditional methods of slurry cutoff wall construction include the vibrating beam method. A vibratory hammer is used to drive special steel beams to design depth along the wall alignment. Cement-bentonite slurry is injected during penetration and removal of the beam. The penetrations are overlapped to construct a continuous barrier. The finished wall creates a thin groundwater barrier with low permeability.