Abstract: There were many defects with auxiliary dam construction, and vertical cut-off wall solved them. By analyzing the monitoring data, the conclusion was gotten that the monitoring instruments and measured stress-strain of the cut-off wall were normal, as well, with normal impoundment, the cut-off wall was safe．

摘要： 副坝工程存在许多问题，垂直混凝土防渗墙的实施彻底解决了这些隐患。对防渗墙观测资料的分析计算说明，防渗墙埋设的观测仪器工作正常，防渗墙的应力应变正常，且具备一定的规律。正常蓄水情况下，防渗墙的运行是安全的。