某水库大坝坝基渗流控制关键技术措施的研究

Key measures of dam foundation seepage control in a reservoir dam

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。

According to the measured osmotic pressure of the piezometric tube at old river channel sec-tion, combined with the engineering geological conditions of dam foundation, the reasons of high osmot-ic pressure of dam foundation of a reservoir were analyzed. Then, construction of concrete imperviouswall in dam body and curtain grouting in bed rock of dam foundation were conducted to cut off the hy-draulic connection between sand gravel layer of dam foundation and reservoir water. This measure ef-fectively controlled osmotic pressure of dam foundation and eliminated potential safety hazards of dam.