Dam foundation engineering geological conditions are very important to the safety and durability of hydraulic struc-tures. Fault, fissure and fracture zones, and silty sand layer were exposed in excavation of dam foundation of Yueliangwan Dam. The inhomogeneous deformation rate and seepage problems are the key to dam foundation treatment. According to the main engi-neering geological problems, measures like foundation cleaning, consolidation grouting and replacement treatment and so on were taken, which significantly improved the foundation rock mass quality. Deformation monitoring during construction period showed that the settlement decreases from the center of the dam to two abutments, the settlement differences of adjacent dam sections are relatively small, and the settlement of the dam tends to be stable.%大坝建基面的地质状况对水工建筑物的安全性及耐久性至关重要. 月亮湾水库大坝开挖建基面揭示存在断层、裂隙及破碎带、粉细砂层等地质缺陷,有效解决坝基的变形速率不均匀和渗漏问题是坝基改良的关键. 针对坝基的主要工程地质问题,采取清基、灌浆和置换处理等措施,使坝基岩体质量得到了显著改善. 施工期变形监测成果显示,坝体沉降量由中部向两坝肩递减,相邻坝段差异沉降较小,大坝沉降趋于平缓.
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