Menard Canada

Slurry Walls

Slurry Walls are a sub-surface barrier designed to inhibit the flow of water and/or contaminants within soils.

Slurry Walls are constructed as a trench excavation, removing the in-situ material and replacing it with relatively impermeable backfill material. The trench is excavated through a supporting material such as bentonite, or a cement-bentonite mix, to the designed depth. The excavation is typically carried out by a hydraulic long-reach excavator.

For a Soil-Bentonite Slurry Wall, the excavated soil is mixed with added soil components, such as bentonite, to create a material with the desired conductivity properties before being placed back into the trench.

In the case of a Cement-Bentonite Slurry Wall, the excavation support fluid is self-hardening and is allowed to set within the trench to form the wall. The excavated material must then be disposed of or re-used elsewhere. 


  • Slurry walls can be installed at depths of up to 26 meters (90 feet) with specially modified equipment
  • Creates a continuous barrier that can be installed in a specific orientation or shape
  • Hydraulic properties of the wall can be tailored to specific project requirements

Featured Slurry Walls Projects

  • Vale Nickel Mine

    Thompson, MB
    The cut off wall was one part of the remediation project of the Vale mine in Thompson. In order to prevent the tailings from producing acid while reacting with the air, water has to cover them. As a consequence, the tailings dam needed to be raised and also needed to become an impervious dam to hold a hydraulic water head... Read More