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针对某水库副坝坝基长期存在的渗漏问题,在综合分析历次地质勘察结果的基础上,采用高密度电法对副坝进行无损探测,同时,采用有限元法对副坝渗流性态进行二维数值模拟,分析坝基渗漏对副坝渗透稳定性的影响。结果表明,副坝坝基渗漏主要是由于坝基存在强透水的砂砾石层;副坝坝基渗漏未彻底解决的主要原因是已采取的防渗措施不当或存在质量缺陷,1978~1979年实施的桩号0+678~0+700段沟槽防渗墙存在缺陷,2000年实施的灌浆效果不佳;防渗墙失效后,副坝坝基砂砾石层在校核洪水位工况下可能发生渗透破坏,建议进一步采用混凝土防渗墙对副坝坝基进行防渗加固处理。
Aiming at the long-term seepage problem of the dam foundation of a reservoir, based on the comprehensive analysis of previous geological survey results, the non-destructive detection of the auxiliary dam is carried out by using the high-density electrical method. Meanwhile, the seepage behavior of the auxiliary dam Dimension Numerical Simulation to Analyze the Influence of Dam Foundation Leakage on the Seepage Stability of the Auxiliary Dam. The results show that the seepage of the auxiliary dam foundation is mainly due to the strong water-permeable gravel layer in the dam foundation. The main reason for the incomplete settlement of the auxiliary dam foundation is the improper anti-seepage measures or quality defects, There is a defect in the seepage cutoff wall of station 0 + 678 ~ 0 + 700 and the poor grouting effect was implemented in 2000. After the seepage cutoff wall fails, infiltration of the subgrain dam foundation gravel layer may occur under the condition of checking flood level Destruction, it is recommended to further use of concrete cutoff wall of the secondary dam foundation seepage reinforcement.