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扬压力是重力坝的重要荷载之一，其大小直接影响坝体稳定及工程安全运行。潘家口主坝采取了闭路式抽水减压排水系统。从实测资料计算、分析结果可以看出， 河床坝段、岸坡坝段的渗压系数ａ２ 均小于设计值０．２～０．３，尤其是河床坝段的扬压力安全度预留较大， 设计偏于安全。总之， 大坝经多年高水位运行， 坝基工作状况基本正常， 其防渗、排水及降压等措施安排合理， 效果明显。
Yang pressure is one of the important loads of gravity dam, its size directly affects the stability of the dam and the safe operation of the project. Panjiakou main dam to take a closed-circuit pumping decompression drainage system. According to the measured data and the analysis results, it can be seen that the seepage coefficient a2 of riverbed dam and bank slope dam are both less than the design value of 0.2 ~ 0.3, especially the safety of hoisting pressure of riverbed dam is reserved , The design is partial to safety. In short, the dam has been operating at high water level for many years and the working conditions of the dam foundation are basically normal. The measures such as seepage prevention, drainage and pressure reduction are arranged reasonably and the effect is obvious.