<![CDATA[The foundation of Bagong Dam in Trenggalek Regency faces geological challenges characterized by lithological heterogeneity with high permeability (0.03-106.70 Lugeon) and variable rock mass strength. This study aims to evaluate the influence of geological characteristics on grouting performance by integrating permeability classification and multi-parameter rock quality assessment. The research utilized grouting trial data from three main zones (Right Abutment, River Bed, and Left Abutment) employing methods that include Lugeon permeability testing, RQD, core sampling, and UCS. Grouting effectiveness was evaluated using the Quíñones-Rozo (2010) classification system and RQD regression analysis. Results demonstrated a reduction in permeability from Medium-High class to Very Low-Low following grouting, with effectiveness values of 94.8% (Right Abutment), 90.79% (Left Abutment), and 78.91% (River Bed). Analysis revealed three depth-dependent response zones: shallow zone (5-15 m) with high variability but good efficiency, transition zone (15-25 m) with consistent performance, and deep zone (25-40 m) with high effectiveness. Correlation analysis between RQD and grouting effectiveness yielded R² = 0.254 (Effectiveness = 0.408·RQD + 61.30), indicating that RQD alone is insufficient as a standalone predictor, corroborated by the PH18 anomaly (RQD 35%, effectiveness 95.65%) which demonstrates the necessity of multi-parameter integration. These findings prove that integrated permeability assessment and rock quality evaluation provide a more reliable basis for assessing grouting performance compared to conventional approaches using a single parameter.]]>
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