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Reservoir RIM treatment at Teesta-III hydro electric project

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Maccaferri involved in the Teesta-III hydro electric project with Terramesh and ParaLink.

The Teesta-III HE project (1200MW) is located in the Himalayan State of Sikkim and is part of six stage cascade development of the Teesta Basin. The project is under active construction and is slated for commissioning by March 2016.

The reservoir and its surrounding areas in these fragile Himalayan geologic formations is susceptible to occurrences like bench settlement slides, slips and damage to settlement, especially during the operation of the reservoir. The “Reservoir Rim Treatment” was evolved by supplementing and enhancing conventional geosynthetic techniques.

The Rim treatment work has been planned and designed in consultation with M/s Maccaferri Environmental Solutions Pvt. Ltd. using geomembrane and geofabric materials. The specialized materials used in the Rim treatment are the Terramesh System, gabion baskets, Paralink, Biomac and geotextiles.

Terramesh is used for soil reinforcement within mechanically stabilized walls and slopes. It is engineered from heavily galvanized and PVC coated double twisted steel wire mesh. The steel wire used for manufacturing gabions is heavily zinc coated soft temper steel. A PVC coating with nominal thickness of 0.50mm is applied to provide added protection for use in polluted environments where soil or water is acidic or to take care of risk of corrosion.

Paralink is a high strength geogrid and is primarily used on structures that require very high strength reinforcement like basal reinforcement over piles or embankments soft soils. In this project, it is being used in combination with Maccaferri Terramesh to form “hybrid” structures. Paralink  geogrids are planar structures consisting of monoaxial array of composite geosynthetic strips, and is one of the most tried and tested geogrids in existence in high performance applications.

Maccaferri Biomac is a range of biodegradable blankets used for short term erosion control applications. This rolled erosion control product (RECP) acts as a reinforced mulch, protecting the vulnerable seeds and soil from erosion whilst they germinate.

The non-woven Geotextile (Terram 1000) was provided as a separator textile to the rear end of the Terramesh and gabion units. Terram 1000 is a permeable textile for filtering and radially draining media with a high permeability of 100L/m2/s. Its unit weight is 125gm per sqm and having a tensile strength of 8KN/m. for each strip.

The Environment friendly M/s Maccaferri design for Rim Treatment has been a unique feature in the Teesta-III project. The application and use of geosynthetics woven or non-woven, Paralink and other Maccaferri materials has been quite innovative and a big step in the course of sustainable project management and shall act as a benchmark for the hydropower construction industry.

The successful implementation of such works depend largely on the correct laying procedure of materials and therefore it is important that supervising engineers and work supervisors understand the basic mechanism and functionality as well as efficacy of the complete arrangement. The successful implementation is key to success of such new techniques, and Maccaferri teams are available to support clients during all phases of the construction cycle.

Contact us to discover interesting technical details.

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