More precisely, the hybrid retaining wall system was 88 metres of the wall was a Mechanically Stabilized Earth (MSE) retaining wall. This portion of the wall is a hybrid retaining panel system. The hybrid retaining panel system consists of concrete facing panels, installed between steel posts and 3-metre-long soil reinforcement (Tenax geogrid) at every 500mm spacing.
A Lightweight Cantilevered Retaining Wall.
The additional 40 metre cantilevered retaining wall used EPS (Expanded Polystyrene) backfill. Part of the backfill behind the concrete panels is replaced with EPS blocks, to reduce the load on the existing retaining wall. The EPS blocks are installed on top of native soil at 2:1 slope, so the total load on the wall facing is significantly reduced.
A Visual Screen.
A total wall length of 128 metres and an added height of 1.2 metre high noise wall was installed integral to the retaining wall structure.
This noise wall will not only mitigate noise levels from the truck loading dock, but it also serves the unique purpose of a visual screen from truck lights. A sort of “tunnel effect” would be created from trucks the yard on the other side of the road below (Vickers road). For this reason, the specified wall height will prevent any visual impairments to drivers below by blocking the shining lights at night.
The unique geotechnical engineering challenges were an opportunity for our team to shine. “In addition to a retaining wall system that met all of the criteria of the challenging site conditions, we were able to offer a dramatic cost-savings to the customer by engaging our in-house engineering and expertise during the bid process where we had the greatest opportunity,” explained John Broadhead, Senior Sales Leader, Durisol.