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安康水电站左坝肩具有地形单薄、岩石软弱透水性强的特点,给渗控设计带来一定难度。设计上采用的坝基全面固结灌浆,双排高压灌浆帷幕,混凝土截水墙及坝基坝肩排水等综合治理防渗减压方案,以保持蓄水后单薄分水岭自然稳定是有效可靠的。为论证设计方案,进行了三向电阻网渗流试验,试验中取得的根据观测的地下水位线反求渗透系数的反演试验成果和预报水库蓄水后地下水动态的正演试验成果,表明设计比较合理。为大型水电站坝肩渗控设计积累了经验。
The left abutment of Ankang Hydropower Station has the features of thin topography, soft rock permeability and strong water permeability, which brings certain difficulty to infiltration control design. The design of integrated foundation consolidation grouting, double-pressure grouting curtain, concrete cutoff wall and dam foundation dam drainage and other comprehensive measures to prevent seepage and decompression in order to maintain the natural stability of thin watershed after impounding is effective and reliable. In order to demonstrate the design scheme, a three-way resistive net seepage test was carried out. The inversion results of the reverse osmotic coefficient obtained from the observed groundwater bit line and the forward test results of predicting the groundwater dynamic after the impoundment of the reservoir showed that the design comparison reasonable. It has accumulated experience for the seepage control design of the dam abutment of a large hydropower station.