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Mr. Manish Barot, Head Technical, Sales & BD, TechFab India Industries Ltd

Problem:

INEOS Styrolution is a global styrenics supplier and is headquartered in Germany. It is a subcompany of INEOS and provides styrenics applications for many everyday products across a broad range of industries, including automotive, electronics, household, construction, healthcare, packaging and toys/sports/leisure. One of its plants is situated at Katol village on the bank of Orsang river. Orsang is the biggest river of Chhota Udaipur district. It is the main source of the sand in this region. In 2018, Heavy rain has caused flooding in Katol and nearly 4,000 people became homeless and were relocated to safer place by NDRF commanders.

Almost every year, Orsang river overflows due to heavy rain. As this plant is situated on the bank of Orsang river, the land adjoining the bank gets severely eroded due to high discharge and velocity during monsoon. The height of the river bank which was to be protected was varying from 3m to 9.6m. The length of the stretch to be protected was approximately 184m.

The client desired to adopt a solution that is technically superior and commercially viable to the heavy erosion problem as well as for the reclamation of land on the sides of the river.

Solution:

As the site is in high flood zone it was necessary to provide a retaining structure which is flexible, permeable, cost effective and environmental friendly. Based upon the site conditions and project requirements, TechFab India has proposed to construct Reinforced Soil Wall with Gabion Fascia which will provide a sustainable, environmentally friendly solution for this project. The sedimentation of soil transported by water will take place in the voids between stones and the eventual appearance of vegetation, increases monolithicity, improving the static characteristics of the structure over time.

This system was adopted by the client as it could serve the purpose of stabilizing the river bank adapting to the differential hydrostatic pressures as well as the reclamation of the land could be done in an effective manner.

The typical cross-section drawing for Gabion Fascia Reinforced Soil Wall is as follows: , which shows the Techfab Metal Gabions as Fascia and Techgrid Geogrid as High strength Geogrid Reinforcement and Techgeo Nonwoven Geotextile as filter media behind the Gabion fascia. The maximum height of retention in this project is around 9.6m, to protect the wall foundation from scouring flexible launching apron with Gabion Mattress is suggested at the river bed level.

Advantages of Gabion Fascia Reinforced Soil walls over Conventional RCC Retaining Wall :

•  The proposed system did not require heavier or/and deeper foundation as required for conventional RCC retaining wall.

•  The Gabion fascia of the system is permeable in nature and allows the water to drain off and Non-Woven Geotextile behind the fascia did not allow the soil to pass through so the combine system will drain off the excess water from the backfill. This process restricts the build-up of hydrostatic pressure.

•  The proposed system enables to withstand differential settlement without affecting the integrity of the structure

•  Vegetation was permitted to grow with the system, thus enabling it to blend into the natural environment and roots of the vegetation further increase the strength of the structure. which is not the case in RCC/Masonry Retaining Structure.

•  The Gabion Fascia Reinforced Soil Walls are more cost-efficient and can construct speedily compare to any other similar Rigid structure.

Conclusion:

The Project is completed successfully and serving its purpose. The client was very happy and satisfied with product quality of TechFab India Industries Ltd.

For further details kindly contact :

TechFab India Industries Ltd.

712, Embassy Centre, Nariman Point,

Mumbai – 400021

Tel: + 91- 22 - 2287 6224 / 6225

Fax: + 91- 22 - 2287 6218

E: info@techfabindia.com

W: www.techfabindia.com