Oaks Designer Resource Guide 6.0

Stabilized Backfill Wall WHAT IS STABILIZED BACKFILL? Stabilized backfill is a low strength ready mix concrete consisting primarily of aggregate, cement and limited water (low slump); the sand component is not included. Additives are used as required for local conditions. Mix designs are available. WHAT DOES STABILIZED BACKFILL DO? Stabilized backfill serves two primary functions: it increases the overall mass of the retaining wall structure, and it serves as the drainage layer behind the wall (reason why no sand is included in the material). HOW IS STABILIZED BACKFILL PLACED? Stabilized backfill can be poured directly from a ready mix delivery truck; conveyors and/or pump trucks can also be used where available. The material should be placed in maximum 600mm (2’) lifts, and because it has a low slump will need to be worked into place. Do not add water as this could compromise the strength of the end product. Geogrid is placed between the wall blocks and stabilized backfill at every third course to provide a connection between the two materials. WHEN TO USE STABILIZED BACKFILL? This approach is commonly used when lot lines, rock outcroppings or other obstructions limit the amount of excavation that can be done, or to provide enhanced stabilization for fences situated close to the back of the wall.

Please consult with Oaks staff for stabilized backfill supplier contacts.

Multi Depth Gravity Wall WHAT IS A MULTI DEPTH GRAVITY WALL? Multi depth gravity walls use products of at least two different depths (Proterra TM ) to increase the overall mass of the wall. WHAT DO THE DEEPER UNITS DO? The deeper units increase the overall mass of the retaining wall structure, eliminating the need for geogrid behind the wall. HOW ARE THE DEEPER UNITS PLACED? Clamps are required to place Proterra TM units, where double or triples are used, the clamp needs to open to as much as 1125mm wide (see adjacent photo). WHEN TO USE MULTI DEPTH GRAVITY WALLS? This approach is commonly used when lot lines, rock outcroppings or other obstructions limit the amount of excavation that can be done, or where future works behind the wall could potentially compromise the structural integrity of a geogrid reinforced wall. Examples would be future planting of trees or installation of an inground pool. In both cases, any geogrid behind the wall could become damaged during excavation. Please consult with Oaks staff when ordering for multi depth gravity walls as the specific units needed will differ depending on the desired facial appearance of the wall.

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APPLICATIONS AND SOLUTIONS

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