When would it be appropriate to use slurry trench walls?

When would it be appropriate to use slurry trench walls?

Slurry walls are used to contain contaminated groundwater, divert uncontaminated groundwater flow, and/or provide barriers for groundwater treatment systems.

What is the slurry wall and why was it built?

A slurry wall is a civil engineering technique used to build reinforced concrete walls in areas of soft earth close to open water, or with a high groundwater table. This technique is typically used to build diaphragm (water-blocking) walls surrounding tunnels and open cuts, and to lay foundations.

What is slurry method?

Slurry displacement is a method to form a drilled hole by displacing the soil instead of extracting it. Drilling fluid – or slurry – is introduced into the hole as it is being drilled. The concrete is placed under the slurry using a rigid delivery tube. As the concrete is being poured it displaces the slurry.

What is a cutoff wall used for?

Cut-off wall is a device use to reduce or prevent the seepage of water through the pervious foundation. It is always provid below the upper surface of the foundation. If the cut-off wall extends through the foundation to impervious material below, it is called complete cut-off wall.

Is slurry permeable?

The properties of interest for most CB slurry walls are strength and permeability. CB slurry has a relatively high water content and because of this there are more water-filled voids than in a Soil Bentonite backfill.

What are the types of barrier used in Geo environmental engineering?

2.2.2 Barrier System Orientations

Barrier Orientation Typical Components
Lateral barriers Soil-bentonite and cement-bentonite walls, PCC walls, soil-cement and jet-grouted walls, sheet pile walls, vertical geomembranes
Low-permeability “treatment” walls
Vertical wells and trenches

What is cut-off walling?

Cut-off walls are installed as trench excavations whereby in-situ materials are removed and replaced by a relatively impermeable backfill material. The trench is excavated through a supporting fluid, usually bentonite or bentonite cement suspension, over the depth designed for the barrier.

What is waterproof slurry?

Tanking slurry or “cementitious tanking” is a thick liquid coating that is applied to the masonry surface to create a waterproof barrier. It is essentially a type of cement fortified with polymers and other aggregates.

Can you apply tanking slurry to wet walls?

Cementitious Tanking Slurry: If the damp problem is very minimal and you only intend to use the space as a storeroom then it may be the case that the simple application of a damp proof paint or liquid bitumen masonry paint can be painted directly onto the brickwork.

What is vertical barrier?

Vertical barriers are seepage control elements that restrict the horizontal movement of water. Sheet piles, slurry walls, and geomembrane walls are the most common types of these barriers. Vertical barriers are one of the best effective ways to reduce seepage, uplift water pressure and exit gradient.