Analysis of upstream slope stability during rapid drawdown - Sidi Abdelli dam as a case study
DOI:
https://doi.org/10.38208/jgg.v2.444Keywords:
Earth dam, Slope stability, Rapid drawdown, Factor of safety, Geoslope/WAbstract
Many factors, including soil permeability and mechanical properties, upstream side slope, drawdown ratio, and drawdown rate, influence the stability of an earth dam during sudden drawdown. This paper investigates the influence of rapid drawdown on earth dam upstream slope stability and its role in the change of pore water pressure at different locations and factor of safety of the upstream slope. To achieve the aim of this study, the Sidi Abdelli dam was taken as a case study by using the Geo-SLOPE/W program based on the limit equilibrium method. The results show that the pore water pressures are very low at the toe of the dam and then increase as the initiation of pore water dissipation from the dam and then decrease as the elevation, as well, the velocity vectors start to exit from the upstream side, the possible seepage face is on the upstream side. As well as, the factor of safety of the upstream slip surface decrease with the initiation of rapid drawdown, the upstream slope is no in a safe stability condition. But, after 13 days the factor of safety increases above value 1.00, that is means the upstream slope will be in a safe condition.
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Copyright (c) 2024 Hicham Charrak, Nadia Smail, Bouchrit Rouissat, Hamza Basri, Almoutaz Bellah Alsamawi
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