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<p>In Ethiopia, where agriculture is crucial to the economy, the construction of irrigation dams like the Ashebeka dam irrigation project is essential. This project faces engineering challenges affecting its water tightness and stability. The study aimed to assess the engineering geology of the dam foundation and reservoir through surveys, drilling, and testing. Techniques such as electrical resistivity surveys, borehole drilling, and Schmidt hammer rebound value measurements were employed to evaluate the engineering properties of the rocks. The site features varied rock types, including weathered ignimbrite, tuff, and basalt. Study results showed differences in rock strength and soil permeability, with soil permeability decreasing with depth. The soils, primarily clayey silt, exhibited varying plasticity and permeability. Stability analysis found the abutments stable when dry but unstable when saturated. Recommendations include grouting, bench stabilization, slope geometry modification, drainage, and shotcrete systems to enhance stability.</p>

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Evaluation of the Stability and Suitability of Ashebeka Dam Foundation and Reservoir Area, Central Ethiopia

  • 期刊论文

  • 发表日期：

    2025年1月19日

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  • Alemayehu Solomon,
  • Endalu Tadele Chala,
  • Nagessa Zerihun Jilo,
  • Yadeta C. Chemeda

摘要

In Ethiopia, where agriculture is crucial to the economy, the construction of irrigation dams like the Ashebeka dam irrigation project is essential. This project faces engineering challenges affecting its water tightness and stability. The study aimed to assess the engineering geology of the dam foundation and reservoir through surveys, drilling, and testing. Techniques such as electrical resistivity surveys, borehole drilling, and Schmidt hammer rebound value measurements were employed to evaluate the engineering properties of the rocks. The site features varied rock types, including weathered ignimbrite, tuff, and basalt. Study results showed differences in rock strength and soil permeability, with soil permeability decreasing with depth. The soils, primarily clayey silt, exhibited varying plasticity and permeability. Stability analysis found the abutments stable when dry but unstable when saturated. Recommendations include grouting, bench stabilization, slope geometry modification, drainage, and shotcrete systems to enhance stability.