ROAD OVER BRIDGE NEAR DIBRUGARH (ROB 15)

For retaining the bridge approaches, Maccaferri proposed ParaWeb® wall system (i.e. reinforced soil system) as the retaining wall. In order to avoid deep excavation and replacing the foundation soil, the ParaWeb® wall system with basal reinforcement as ground improvement measure was proposed. Basal reinforcement is an efficient technique to improve the bearing capacity and global stability of the embankment or retaining wall. Basal reinforcement distribute the load over large area and provide shear resistance. Basal reinforcement prevents collapse and limit vertical movement of the embankment surface. Ground improvement was carried out for heights ranging from 6m to 5m and 5m to 1m. The analysis was carried out for seismic and static conditions considering the site condition. ParaGrid® reinforcement with a tensile strength of 50kN/m was used for ground improvement. After installation of basal reinforcement reinforced soil wall was constructed for the approaches with concrete facia and ParaWeb® as reinforcement. Foundation / Reinforced soil used : Angle of friction = 30 ° Bulk density = 20 kN/m3