Current Science

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This article presents the permanent deformation of an earthen dam located in the vicinity of a safety related structure for Mw = 6.5 design basis earthquake. A non-linear 2D dynamic analysis using a real earthquake motion compatible with the design spectrum was performed to check the earthquake-induced deformations of the dam. Deformations of the dam were also estimated by semi-empirical and empirical methods suc has Seed and Makdisi’s method, Newmark’s double integration method, Jansen’s method and Swaisgood’s method. Results from different methods are compared to obtain a range for the value of permanent deformations of the dam. It is observed that the lateral deformation obtained by Seed and Makdisi’s method is the highest while Jansen’s method predicts the highest crest settlement. The crest settlement of the dam is found to vary between 11.8 mm and 17.8 mm, which is within the safety limits according to IITK-GSDMA guidelines.

Keywords

Earthen Dam, Dynamic Analysis, Deformations, Non-Linear Finite Element Analysis.
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