In a detailed design process, Terre Armée in India used in-house technical know-how to design the in-situ soil reinforcement in the form of TerraNail® to stabilize the slope. Since the purpose was temporary, Terre Armée in India opted for a driven system.
The TerraNail® system comprised of black steel Fe 500 grade nails driven up to 9m at designed intervals.
The design principal was based upon Bishop’s stability analysis.
To economize the system, Non-woven Geotextile held by welded wire mesh with cross reinforcement bars were proposed as fascia to protect local failure of soil.
By this method, Terre Armée in India successfully provided the solution for temporary protection of slope as well as completely avoided the shotcrete proposed earlier.
This solution also provided a path for water seepage, which otherwise would have been trapped due to shotcreting and imposed pure water pressure on the slope.