AnchorFast has combined a large block, large footing plate along with an anchor pile and stainless-steel cabling to create the worlds first gridless, modular block retaining wall system. The patented short pile anchor and tie down cabling system allows the installer to minimize excavation, eliminate geogrid and imported fill costs, while providing ductility to resist earthquake shaking.
How does the patented AnchorFast Retaining Wall System address the most common modes of failure for large retaining walls?

Common Modes of Retaining Wall Failure

  • Sliding
  • Overturning
  • Bearing
  • Global

Sliding occurs when the retaining wall translates outward in response to the lateral load from soil, groundwater, surcharge forces, and earthquake.

AnchorFast Solution: Sliding is resisted by frictional force developed between the Foundation Footing Plate and the underlying base course gravel. The short Anchor Piles provide additional shear and passive soil resistance in sliding when the weight of the wall is insufficient to prevent sliding.

Overturning is the rotational toppling of the rows of blocks about the toe of the wall. The rotation can occur about the toe of the foundation footing plate or between rows of blocks above the base of the wall in response to external loads.

AnchorFast Solution: Overturning of the entire wall system is resisted by the weight of the AnchorFast wall, uplift and compression resistances of the rear and front piles (when used), the weight of backfill resting above the Foundation Footing Plates and friction of the soil against the back of wall. It can also be enhanced through the use of soil anchors and geogrid.

Bearing capacity failure occurs when the soil supporting the base of the retaining wall shears in response to the concentrated load exerted by the retaining wall.

AnchorFast Solution: The front anchor piles act in compression to prevent failure. The compression piles provide shaft resistance and bearing resistance, often providing over 20 kips in total compression resistance per pile against bearing failure. The tension anchor piles at the back of the wall plus the weight of the soil above hold down the AnchorFast Foundation Footing Plate maintaining the compression force on the soil under the entire foundation plate. This allows the total width of the Foundation Plate to resist the compression force acting to induce bearing failure.

Global failures are much like large scale bearing capacity failures, whereby the entire wall is encompassed in the soil failure. Factors affecting the global stability include the frictional and cohesive strength of the subgrade and retained soils, the groundwater and surface water control systems incorporated into the design, the site geometry, the presence of pre-existing soil failures, the height of retaining wall, and transient loading.

AnchorFast Solution: The use of the short piles incorporated into the AnchorFast Retaining Wall can significantly enhance the global stability of the retaining wall. These are often beneficial on steep slopes, where walls at or greater than 12 feet high (3.6 m) are required.

The AnchorFast Edge:

  • Minimizes excavation
  • Eliminates or reduces the need for geogrid for retaining walls up to 20′ high
  • Design allows for use of native backfill approved by engineers
  • Allows for the construction of retaining walls tighter to property lines in hillside areas
  • Design for civil consultants or sub division developers without concerns for geogrid interference with underground utilities
  • Block size optimizes speed of construction and offers the easiest and fastest installation at a cost savings of 20-30%
  • The block configuration accommodates curves
  • Seismic performance