Abstract

Abstract
The Tehri dam is the highest dam in India. The height of dam is 260 m. It is situated on the Himalayan
region which is in earthquake prone region. A Sengupta in 2006 found that the predicted deformation
due to an M=7.0 earthquake are not large enough to compromise the safety of the dam. However the
deformation predicted by Seed and Makdisi’s method, and Bureau’s method for an M=8.5 earthquake
are large enough to compromise the safety of dam. The Seed and Makdisi’s procedure predicted the
maximum deformations, while the minimum deformations are computed by Jansen’s method. In the
present work, the stability analysis four type of analysis such as structural stability analysis, Centre of
slip circle by genetic algorithm, stability of dam under sudden draw down condition and dynamic
analysis are considered. Structural stability analysis have done by Fellenius method and radial slice
method. In Fellenius method three number of slip circles are taken which cuts the slope at two third
distances from top of slope. By finding the resisting moment and driving moment the factor of safety is found that for first slip circle, second slip circle and third slip circle are 1.997,2.103 and 2.045
respectively. In the radial slice method the failure wages are divided into number of slice radially by
joining the line from the center of slip circle to the arch. The factor of safety is found as 1.15. The
coordinate of Centre of slip circle has been found by genetic algorithm. In order to validate the
genetic algorithm method, the input data has been imported from the results of graphical method. The centre coordinate of slip circle is obtained as (210,485) which was found to be very close to the value of Centre of slip circle by graphical method. Numerical analysis has been made by using
commercially available software PLAXIS under sudden draw down condition. The deformation in X
direction was 16.99 m. Dynamic analysis has been used by PLAXIS software and the total
deformation is obtained as 0.4150 m. T

Keyword: Slope stability Analysis, Dynamic Analysis, Factor of Safety, Tehri Dam

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