Reinforced Earth Walls:
When constructing ROBs, fly-overs and underpasses, it is often not possible to provide sloped earthen embankments for the approaches, which are as high as 8-12 m at places. It is cheaper to construct reinforced earth (RE) walls than reinforced concrete retaining walls. The RE walls consist of :
(a) a facia wall in panels of suitable size,
(b) a reinforcing element of metal strips or geogrids or geofabric, and
(c) granular fill to provide friction between the reinforcing element and the soil. Figure gives a view of the arrangement.
Figure: General Arrangement of a Reinforced Earth Wall