三峡工程一期土石围堰性态观测

三峡工程一期土石围堰是前期工程的关键单项工程，在围堰运行期，对围堰堰体、柔性防渗心墙及渗流渗压状态进行监测和分析，掌握围堰运行全过程的工作性态，以确保围堰本身的安全以及三峡右岸一期工程的安全顺利进行。分析表明：围堰堰体的工作性态基本正常，变形在空间上协调；柔性防渗墙防渗效果明显，应力状态安全稳定；除局部地段渗流量较大外，渗流状态基本正常。目前围堰是稳定安全的。

Monitored behaviour of TGP''''s first stage earth rockfill cofferdam

The first stage-earth rockfill cofferdam of Three Gorges Project is a key item of its preparatory works. In order to make sure of operational behaviour of the cofferdam,and then ensure the safety of itself as well as successful construction of the right bank first stage works,safety monitoring instrumentation and measurements have been carried out on the deformation of the cofferdam body and flexible concrete core wall and the status of seepage flow through it during its operation period. The recorded results show that the operational behaviour of the cofferdam is normal;the seepage proof effect of the core wall is obvious and its stresses all are far less than strengths of the material of which the core wall was made;and the seepage status manifests no trouble,except some larger seepage discharge in a limited locality. The cofferdam is safe and stable.