Slope Stability Assessment for Sego Dam Site Southern Ethiopia
| dc.contributor.advisor | Trufat Hailemariam | |
| dc.contributor.author | Mehari Gebremeskel | |
| dc.date.accessioned | 2026-07-28T11:19:59Z | |
| dc.date.available | 2026-07-28T11:19:59Z | |
| dc.date.issued | 2023-05 | |
| dc.description.abstract | A thorough evaluation of slope stability was carried out at specific critical sections of the Sego dam and irrigation project site in southern Ethiopia. The identification of these critical areas and the determination of their geotechnical characteristics involved an extensive field survey, which included on-site testing, sample collection, and laboratory analysis. Various measurements were taken during the field survey, including slope geometries, orientation of discontinuities, and in-situ Schmidt hammer rebound tests. Additionally, sampling was conducted. Subsequently, stability analyses were conducted using both kinematic and deterministic methods. Thorough assessments were performed to examine the stability of possible unstable slopes, employing deterministic methods. The analysis encompassed evaluating the stability of critical slope sections under varying water saturation conditions, both in static and dynamic scenarios. Data regarding structural discontinuities, the Geomechanics (RMR) rock mass classification system, and slope geometry were incorporated into the calculations for determining the FOS. The SHRV test provided a range of values for the point load index and UCS, from 4.2 MPa to 9.06 MPa and 68 MPa to 106 MPa, respectively. Additionally, the RQD and RMR values spanned from 42 to 75 and 35 to 69, respectively. Analysis of the rock mass rating system indicated that slope sections L-SS-2 and R-SS-3 had favorable rock quality, while L-SS-1, R-SS-1, and R-SS-2 exhibited poor quality. Similarly, markland test conducted by DIPS.7 revealed potential wedge and planar modes of failure in L-SS-2 and R-SS-3, as well as L-SS-1, R-SS-1, and R-SS-3, respectively. Under dynamic saturated conditions, all critical rock slopes, except R-SS-3, exhibited greater instability compared to static dry conditions, particularly when subjected to seismic loads. These findings suggested that assuming full saturation and seismic loading rendered the slopes unstable. Consequently, a sensitivity analysis of the governing parameters for slope stability was performed, and appropriate remedial measures were proposed. | |
| dc.identifier.uri | https://etd.aau.edu.et/handle/123456789/8719 | |
| dc.language.iso | en_US | |
| dc.publisher | Addis Ababa University | |
| dc.subject | Deterministic Analysis | |
| dc.subject | Facror of Saftey | |
| dc.subject | Kinematic Analyses | |
| dc.title | Slope Stability Assessment for Sego Dam Site Southern Ethiopia | |
| dc.type | Thesis |