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<p>Hydropower accounts for over 70 % of Georgia's electricity generation, making the structural integrity of major dams a critical issue. The Enguri Dam, one of the tallest in the world, is of particular importance due to its energy contribution and the potentially severe consequences of failure. As part of the DAMAST project, boreholes were drilled to investigate the geological conditions near the dam. Data from boreholes DAMAST-KIT-1 and -3 enabled a revised interpretation of the Branch Fault. Zones of low RQD were found to correlate with fault structures. A strong correlation between RQD and UCS was observed within homogeneous lithologies, with low RQD corresponding to low UCS except in highly porous zones. RQD values derived from borehole image logs differ significantly from those obtained from cores due to uncertainties such as healed fractures, weak zones, and stress-related phenomena like core disking. While core-based RQD is more reliable, image logs provide valuable supplementary data, especially where cores are missing. However, image logs may overestimate RQD in breakout zones and underestimate it in cemented fractures. The applied methods also allowed for localized stress field analysis and a refined understanding of fault geometry beneath the dam.</p>

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Bewertung der Gesteinsfestigkeiten aus Bohrkern- und Logging-Analysen

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Thomas Niederhuber,
  • Birgit Müller,
  • Carolin Reichert,
  • Frank R. Schilling,
  • Thomas Röckel

摘要

Hydropower accounts for over 70 % of Georgia's electricity generation, making the structural integrity of major dams a critical issue. The Enguri Dam, one of the tallest in the world, is of particular importance due to its energy contribution and the potentially severe consequences of failure. As part of the DAMAST project, boreholes were drilled to investigate the geological conditions near the dam. Data from boreholes DAMAST-KIT-1 and -3 enabled a revised interpretation of the Branch Fault. Zones of low RQD were found to correlate with fault structures. A strong correlation between RQD and UCS was observed within homogeneous lithologies, with low RQD corresponding to low UCS except in highly porous zones. RQD values derived from borehole image logs differ significantly from those obtained from cores due to uncertainties such as healed fractures, weak zones, and stress-related phenomena like core disking. While core-based RQD is more reliable, image logs provide valuable supplementary data, especially where cores are missing. However, image logs may overestimate RQD in breakout zones and underestimate it in cemented fractures. The applied methods also allowed for localized stress field analysis and a refined understanding of fault geometry beneath the dam.