Abstract: This paper analysed the measured data by piezometer tubes at the main dam foundation fault F11 of Hongmen hydropower station in aspects such as water level, gradient, potential, rope kit picture and so on, which indicated that the effect of anti- seepage curtain was declined, the F11 fault had been in erosion and its operation performance was deteriorated gradually. So that the paper put forward the advice that reinforcement grouting as soon as possible should be adopted to ensure damsafety.

摘要： 对洪门水电站主坝坝基F11 断层测压管资料从水位、坡降、位势、绳套图等方面进行了分析, 结果表明帷幕防渗作用在减退, F11 断层已受到冲蚀, 运行性态正在逐步恶化, 并提出应尽早进行补强灌浆的处理措施, 保障大坝安全运行。