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Authors: Ashokrao, Shikhare Uday
Issue Date: 2009
Abstract: The traditional design approach of embankment dams for earthquake loading is based on conventional methods like pseudo-static method. There is a need to employ new techniques in the design of embankment method. Due to the amendment in the codal provisions and changes in design constants, the design methodology adopted previously needs to be revised. In the present study, an embankment dam is analyzed using different methods including simplified approach and rigorous dynamic analysis. The dam is analyzed using Pseudo-Static, Pseudo-Dynamic, beam analysis and 3-D dynamic analysis. First free vibration response of a dam is evaluated using a lumped mass model. The. material properties obtained from dynamic tests have been used in computation. A lumped mass model is considered for modal analysis. Modal response quantities are carried out in MATLAB. Potential slip surface is identified using Pseudo-static analysis., Pseudo-dynamic method which gives due weightage to the effect of earthquake excitation as a time dependent force and which encounters the effect of primary and shear waves, is introduced for the embankment dam. In finite element analysis, material non-linearity of soil is considered employing Mohr-Coulomb model. The computation has been performed using software FLAC°, based on three dimensional explicit schemes. From the study, it is observed that the factor of safety inferred from Pseudo-static method is greater than that obtained from Pseudo-dynamic analysis. While due to amplification of waves, Pseudo-dynamic method gives smaller values of factor of safety. Hence it appears that Pseudo-dynamic method gives reasonably accurate results. From the finite element analysis using FLAC°, it was observed that the displacement of dam in downward direction is greater compared to that in horizontal direction. From the stress and strain contours, it was observed that stress concentration is at the bottom of the dam near the core on the upstream side. The study has very much practical significance as this is applicable to existing dams as well as for designing new embankment dams.
Other Identifiers: M.Tech
Appears in Collections:MASTERS' DISSERTATIONS (Earthquake Engg)

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