Compared with a traditional biaxial geogrid, TriAx geogrid has a much greater rib depth contributing to improved confinement.

Rib testing

The shape and thickness of the geogrid ribs and the overall structure of TriAx has a direct influence on the degree of confinement and efficiency of the stabilised layer.

TriAx has been designed with deep ribs with a concave profile to maximise confinement of aggregate particles and provide a more effective mechanically stabilised layer.

Trafficking tests and analytical modelling techniques were undertaken to compare performance advantages between the two forms of geogrid with various rib depths.

The results were conclusive in confirming that a much-improved structural performance of a mechanically stabilised layer was achieved with the TriAx geogrid and its deeper rib depth.