Modeling the slope of embankment dam during static and dynamic stability analysis: a case study of Koga dam, Ethiopia
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REVIEW ARTICLE
Modeling the slope of embankment dam during static and dynamic stability analysis: a case study of Koga dam, Ethiopia Amanuel Zewdu1 Received: 27 February 2020 / Accepted: 24 May 2020 © Springer Nature Switzerland AG 2020
Abstract Quantitative assessment of the stability of slopes is very important for the evaluation of an earth fill dam in order to perform the intended function throughout the service life. This study presents the slope stability and analysis of the Koga earth fill dam. The analyses were carried out using finite element-based PLAXIS 2D software. The behavior of both the body and the foundation of the dam was described using the Mohr–Coulomb criterion. Based on the result of this study, the resulting factor of safety values during end of construction for both static and dynamic stability analysis was 1.6221 and 1.3592, respectively. For steady-state condition, the water level was fixed at normal pool level (2015.25 m). The factor of safety obtained for static stability analysis was 1.6136 and the dynamic analysis 1.3157. The rapid drawdown condition is analyzed with normal pool level of 2015.25 m lowered to 2008.5 m. The analysis results showed that the factor of safety for the static and dynamic analysis was 1.2199 and 1.0353, respectively. Using recommended design standards: United States Army Corps of Engineers, British Dam Society and the Canadian Dam Association the slope stability analysis of the Koga earth dam at all critical loading conditions are safe. The displacement result shows the maximum total displacements for static and dynamic analysis were 1.033% and 1.628% of the dam height, respectively. The displacement result coincides with Fell et al. (J Geotech Geoenviron Eng 129(4):307–314, 2003) standards. Keywords Dynamic · Finite element method · Static · Stability analysis · PLAXIS 2D
Introduction Background Adam is stable if the resultant of all forces acting on the dam does not result in movement (Seed et al. 1969). Nowadays, dam safety draws increasing attention from the public. This is because inundations resulting from dam failures can lead to devastating disasters with tremendous loss of life and property, especially in downstream areas. There are many different ways in which a dam can fail. These failures are normally caused by a deficiency in the dam, an outside triggering event, or a combination of the two (Sherard and Dunnigan 1989). Embankment dam failures are mainly caused by lack of thorough investigations, improper design, seepage piping, * Amanuel Zewdu [email protected] 1
Department of Hydraulic and Water Resources Engineering, Debre Tabor University, Debre Tabor, Ethiopia
slope instability, deformation, deterioration and poor maintenance. The main causes of failures of embankment dams are closely related to the erosion of embankment materials caused by either overtopping or seepage erosion (Powledge et al. 1989). Slope stability analysis of earth dam is very important to ascertain the stability of the structure. The successful design of slope r
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