Written by: Rich LovdalLet’s talk
about how geogrid reinforcing mesh works in a Segmental Retaining Wall (SRW)
such as Allan Block. The most common type of geogrid is a polyester coated
mesh. Lightweight grids are typically Bi-Axial,
meaning that their transverse and longitudinal (in the roll direction) strands
are the same strength and these grids are more common in residential
applications. Commercial strength geogrids are Uni-Axial meaning their
longitudinal strands are stronger than the transverse strands. Using these Uni-Axial geogrids in a retaining
wall means that you must roll the grid layers out perpendicular to the wall so
the strong members are running perpendicular to the wall providing the most shear
strength to the wall structure.
Geogrid Reinforcement |

Specifically
in SRW design, the grid combines with the Allan Block facing and the compacted
soil to form what the industry calls a coherent gravity mass. This mass works as a composite unit to resist
any outside forces from surcharges above the wall like roadways or slopes or
internal forces from the active soil forces or seismic events.
For
more information on how grid works please visit our website or see our Allan Block Tech Sheet #396.
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