Geogrid Walls Geogrid Walls Geogrid Walls

Geogrid Reinforced Soil Walls

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General Information

Geogrid reinforced walls are gravity retaining walls with an expanded width (commonly known as “Reinforced Fill Zone”) created by the placement of geogrid behind a column of segmental facing units. The combination of segmental units and geosynthetic layers act together creating a coherent mass to resist the destabilizing forces generated by the retained soil and applied surcharge loadings.

Geogrid reinforced walls should be designed in accordance with local Australian Standards (AS4678) and are designed for the failure modes stated in the list to the right.

The other main considerations of prime importance is drainage within and around the structures and most importantly that the walls are constructed the correct way, paying careful attention to compaction, placement and orientation of geogrids. Again Retaining Solutions has this expertise in-house.

Essentially geogrid reinforced walls, due to their relatively low material and installation costs typically save 25 to 50% compared with conventional concrete retaining walls when above 2m in height. Again such costs are project specific and project specific constraints may dictate the type of retaining solution adopted.

There are a variety of segmental block/geogrid combinations available in the marketplace. Each and every combination has unique connection strength & interface shear strength properties. These properties directly control the internal stability of geogrid reinforced segmental walls. Segmental block/geogrid combinations with poor connection strengths will inherently produce designs utilising more layers of geogrid (i.e reduced vertical spacing between layers).

The properties of the geogrid reinforcing elements play an important role in producing cost-effective designs. Commercially available geogrids are polyester (PET), high density polyethylene (HDPE), polypropylene (PP) or steel (strips, mesh panels or ladders, refer steel reinforced walls section). Refer photos below illustrating the types of geosynthetic geogrids and segmental block combinations Retaining Solutions are familiar with both from design & construction.

Geogrid Types

Geogrid Wall

Polyester - PET

Geogrid Wall

High Density Polyethylene - HDPE

Segmental Block / Geogrid Combinations


Vertical / Polyester

Geogrid Wall

Landmark / Polyester - Unique positiive connection

Geogrid Wall

Keystone / HDPE

Geogrid Wall

Allanblock / Polyester

Geogrid Wall

Keystone / Polyester

Geogrid Wall

Rockwood / Polyester

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Failure Modes

  • External Stability
    • Sliding overturning and bearing pressure assessment
  • Global Stability for short & long term conditions
  • Internal Stability
    • Geogrid tensile overstress
    • Pullout of reinforcement
    • Internal sliding
    • Segmental block stability
      • Connection Strength
      • Interface sheer strength
      • Resistance to bulging


  • Landscaping Walls
  • Car parking area support
  • Approach ramps to bridge overpasses
  • Waterfront structures
  • Stream-training walls
  • Tunnel access walls
  • Waste transfer stations
  • Blast/sound walls

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