Abstract: In 2021, the water level of Miyun reservoir reached a record high and continued to operate at a high level. The seepage data of Zoumazhuang tunnel after water filling was analyzed, including the wa ⁃ ter level analysis of piezometer,  correlation analysis, comparative analysis, potential analysis, flow net analysis and seepage gradient analysis. It was found that the piezometer water level rose first and then fell, and the potential and seepage gradient both increased. It was concluded that the internal piping pas ⁃ sage in foundation of Zoumazhuang dam section Ⅳ was formed, which was harmful for anti-sliding sta⁃ bility under the designed water level. This study can provide reference for the safe operation and safety assessment of earth dams.

Key words: Zoumazhuang tunnel, water filling, piping passage, seepage effect

摘要： 2021年，密云水库库水位创历史新高，并持续高水位运行。对走马庄隧洞充水后渗流资料进行分析，包括 测压管水位过程线分析、相关分析、对比分析、位势分析、流网分析、渗透坡降分析，发现管水位先升后降，位势、渗 透坡降变大，得出走马庄Ⅳ号坝坝基内部形成管涌通道，且达到设计水位时对抗滑稳定不利的结论。本研究为土 坝安全运行和安全鉴定提供了有力参考。

关键词: 走马庄隧洞, 充水, 管涌通道, 渗流影响