Dynamic Analysis of Middle Awash Multi-purpose Dam
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Date
2015
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Addis Ababa University
Abstract
In this dynamic analysis research, Middle Awash high dam which is located in
Ethiopian rift valley seismic zone is analyzed for pre and post earthquake stability
and permanent deformations due to earthquake loads.
The dynamic analysis is done adopting three elsewhere recorded earthquake time
histories, which have different period and duration. Applying these seismic shocks
and using the Newmark deformation method, it is found that the induced
deformations do not require additional extension of dam or cumber height. The
upstream and downstream slopes showed sufficient performance against sliding.
The upstream section steepening is found to be more economical, yet achieving
the minimum required factors of safety for static and post earthquake sliding
failure.
The thick alluvium foundation of the dam is found to liquefy immediately after the
design base earthquake started.
The pseudo-static seismic analysis recommends uneconomical dam section
modification.
The Finite Element and Limit Equilibrium Methods shown to be conservative in
calculating sliding factor of safety for downstream and upstream slopes,
respectively.
Key words: Maximum credible earthquake, Design base earthquake, Finite
element method, Limit equilibrium method, Permanent deformation and
Liquefaction.
Description
Keywords
Maximum credible earthquake, Design base earthquake, Finite element method, Limit equilibrium method, Permanent deformation and Liquefaction