Uniaxial grids are usually punched and drawn HDPE or coated polyester, with long ribs in the roll direction and heavier cross bars at intervals. They are laid with the strong direction perpendicular to the wall face or slope, where the soil pushes outward. Design uses long-term strength after reductions for creep and damage, never the ultimate strength printed on the roll.
Uniaxial geogrid goes in with the roll direction into the slope, not along it; flip it and you've reinforced nothing.
Check roll labels layer by layer; uniaxial grids come in several strengths that look alike, and mixing them up is a common inspection failure.
Also heard as
- uni
- uniaxial grid
- UX grid
Related terms
Geogrid
Polymer grid with large open apertures that interlocks with soil or aggregate to reinforce or stabilize it.
MSE wall
Mechanically stabilized earth wall: compacted fill reinforced with layers of geogrid or steel strips behind a facing.
RSS
Reinforced soil slope: an embankment built steeper than its fill could stand alone by layering geogrid or geotextile in it.
LTDS
Long-term design strength: reinforcement strength left after reductions for creep, installation damage and aging.
Creep
Slow, continuing stretch of a geosynthetic under a constant load over time.