Tehri Hydro Development Corporation Ltd.
The Intake area of Tehri HPP and PSP comprises the hill slopes from El 705 m to El 910 m. Important structures such as Intakes and platform at El 840 m developed for placing hoisting arrangements of maintenance gates and electrical control rooms are located in this area. The rock mass condition in this area is very poor influenced by numerous major/minor diagonal and longitudinal shears intersecting at different levels forming potential wedges which posed problems to the stability of the slope. The toe of this potentially unstable zone is subjected to continuous fluctuations of reservoir level that further deteriorates the stability of the area.
The present paper describes the geological and geotechnical assessment of the area and the stabilization measures adopted on the slopes for preventing failures during reservoir operations.
