Navi Mumbai, Maharashtra, India | City and Industrial Development Corporation (CIDCO), Navi Mumbai
Due to the increased air-traffic at existing Mumbai Airport, a need for a new airport was suggested since many decades. To meet the growing need of the requirement, City and Industrial Development Corporation (CIDCO) proposed an International airport at Kopar in Raigad District of Maharashtra.
The Proposed Navi Mumbai International Airport is located on the banks of Gadhi River near Panvel Creek. Around 1600 hectares of land is required to be reclaimed in the region of Panvel Creek including Gadhi River basin. Therefore it is decided to train the Gadhi River along the airport premises to retain the Backfill soil material on upstream side from the flooding during heavy monsoons and drawdown during the dry season.
Gadhi River is the main river of the Panvel creek with a hard rock bedding surface. Due to Industrial and Residential development around adjacent Panvel city, The Gadhi River is frequently subjected with storms from Thane creek resulting in rise of water levels. The river had a HFL (high flood level) of 6.50m during the July 2005 flood. Thus a safe-grade elevation of 9m from bed rock level was proposed for Airport location. A Retaining wall was proposed to train the Gadhi River along the Panvel creek.
Looking at the site conditions and project needs it was decided to go for solution which was sustainable, environment friendly and blend with the nature. So it was decided to go for composite reinforced soil wall with gabion as fascia which is most viable solution for land reclamation and river training project.
Composite Reinforced soil wall consists of high strength Polyester Uniaxial Geogrid i.e. TechGrid (TGU) as reinforcing material and TechFab Metal Gabion as fascia with GI wire mesh having special coating of zinc90% +Al10%+ PVC Coating.
The Techgrid Geogrid Uniaxial acts as soil reinforcement & TechFab Metal Gabion with stone fillings gives strong, durable and flexible fascia which also give excellent erosion protection to the entire system and protect the backfill material, porosity of Gabion fascia system allow the dissipation of pore water pressure from the backfill material as and when require, and TechGeo Nonwoven Geotextile permits the water to move through the soil while retaining all upstream soil particles. It is used to prevent soils from migrating into drainage aggregate or pipes while maintaining flow throughout the system and maintain system integrity.
The project was completed successfully. The client was very happy and satisfied with product quality as well as quality of work by TechFab India industries Ltd.
