萨扬诺——舒申斯克水电站(见图1)基坑主体工程的混凝土施工是从1972年大坝的溢流部分开始的。第一阶段基坑混凝土的施工,受到和坝基准备工作的钻爆和出碴作业同时进行的影响,也受到大坝溢流部分结构复杂性的影响。1975年10月11日叶尼塞河截流后着手第二阶段基坑作业。11月基坑实际上已排干并 SAYANO - Shushenskaya Hydropower Station (see Figure 1) The concrete construction of the foundation pit works started from the overflow part of the dam in 1972. The construction of foundation pit concrete in the first stage is affected by the simultaneous drilling, blasting and ballasting operations of the dam foundation preparation work, as well as the structural complexity of the overflow part of the dam. On October 11, 1975, the second phase of pit excavation started after the closure of the Yenisei River. The pit in November actually drained