What is the required extend width of the geogrid beyond both edges of the trench?

The required extend width of the geogrid beyond both edges of the trench is based on best practices in ensuring stability and support during and after the construction process. A width of 375 mm beyond both edges of the trench is typically recommended to provide adequate overlap and integration with the surrounding soil and materials. This overlap helps to distribute loads effectively, preventing potential failures or settling in the trench area.

It is crucial that the geogrid extends sufficiently to maintain the structural integrity of the surrounding soil and surfaces. This additional width ensures that any lateral forces or pressures from traffic loads or environmental changes are accommodated, thus enhancing the overall performance of the road or structure being supported.

Other widths, while they may also be in a range that some might consider, do not align with the established guidelines for optimal performance in this context, which have been determined through field applications and engineering studies.