Uungula Wind Farm

Temporary access road construction was challenging due to underlying soft

soils with a CBR of 1–3%. The original proposal, which involved lime

stabilisation, was costly because of limited resources and community concern

around increased truck movements. The client was seeking an alternative

solution, bearing in mind that the on-site crushing facility was only producing

75–150 mm aggregate.

After considering the site conditions and available materials, Tensar proposed

a mechanical stabilisation solution utilising a single layer of large-aperture

Tensar InterAx geogrid to meet the design requirements of 10,000 ESALs

and a minimum CBR of 3%. The client chose to incorporate an additional layer

of Class A geotextile for separation. The adaptability of this solution resulted

in a 40% reduction in construction costs compared to lime stabilisation.