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Slope Stability Analysis under Rapid rawdown Cndition and Siesmic Loads of Earth Dam (Case Study: Mandali Dam)

Prof. Dr. Saleh . Khassaf1, Dr. Maha Rasheed Abdoul- Hameed , Nabaa Noori Shams Al-deen

The one of the most dangerous conditions of earth dams for the upstream side slope is rapid drawdown condition when the countervailing upstream water pressure has disappeared, it causes a danger to the upstream slope. In this work, by applying the Morgenstern-Price presented by the computer program SLIDE V.6.0 is applied to define the potential slip surface and calculate the factor of safety of zoned earth dams (Mandali dam in Iraq) under rapid drawdown condition for maximum elevation with seismic forces effects. It founded that the stability of the upstream slope of Mandali dam is dramatically decreased but still in stable during rapid drawdown condition.