In a detailed design process, Terre Armée India used the in-house technical know-how to design the Reinforced Earth® wall using High Adherence GeoStrap® with synthetic GeoMega® connection system. HA GeoStrap® as soil reinforcement having lateral ribs and made of high tenacity polyester yarns (PET) placed in tension and co-extruded with linear low density polyethylene (LLDPE) to form straps of 50 mm wide. System consists of connection system made of molded polypropylene sleeve, a totally metallic free connection system. Project made use well graded fill material having angle of internal friction (Ф) > 32o and considering a 32 MT Axle loading as design as per RDSO guidelines.
Failure surfaces through reinforced soil block & extending beyond it or encompassing the foundation soil has been analyzed to ensure sufficient length & strength within the reinforced soil mass. In this project client had insisted on performing the hand calculations and graphical analysis, hence the calculations were performed with Swedish Circle Method.
As an additional safety for such important structure it was suggested to use Geocomposite Drain/Geomenbrane below the ballast on railway track to avoid seepage of water from the tracks.
Surface water runoff drainage system have been adopted near the coping beam on the top with proper gradient to facilitate the additional water coming on the railway tracks.
The foundation here was moderately weathered basalt at a depth of 3m. So the minimum foundation depth considered was 1.7m.