Abstract: According to the measured osmotic pressure of the piezometric tube at old river channel section, combined with the engineering geological conditions of dam foundation, the reasons of high osmotic pressure of dam foundation of a reservoir were analyzed. Then, construction of concrete impervious wall in dam body and curtain grouting in bed rock of dam foundation were conducted to cut off the hydraulic connection between sand gravel layer of dam foundation and reservoir water. This measure effectively controlled osmotic pressure of dam foundation and eliminated potential safety hazards of dam.

Key words: osmotic pressure, impervious wall, curtain grouting, effect

摘要： 根据老河槽段测压管的实测渗透压力资料，结合坝基的工程地质条件，对某水库大坝坝基渗透压力偏高的形成原因进行了分析。针对坝基渗透压力高的实际情况，工程上采用在坝体内建造混凝土防渗墙、坝基基岩面进行帷幕灌浆的防渗措施，截断了坝基砂砾石层与库水的水力联系。坝基的渗透压力得到了有效的控制,消除了坝体的安全隐患。

关键词: 渗透压力, 防渗墙, 帷幕灌浆, 防渗效果