户宋河电站溢洪道工程滑坡的形成及经验教训

Experience from the Forming of Engineering Landslide on the Right side of Chute Spillway at Husonghe Hydropower Station

户宋河电站溢洪道陡槽段工程滑坡，由于未按设计要求施工，多次采用水力冲刷搬运土体、先下后上的坡脚切脚掏挖施工方法，在多种因素作用下导致原来稳定的山体发生失稳。本文收集并预测了该滑坡体的发生过程，分析了成因，总结了经验。

As the result of improper construction method, the chute spillway of Husonghe Hydropower Station was not constructed in accordance with original design, soil mass was moved by means of hydraulic scouring and hollow excavation at the toe upwards were carried out for many times. Affected by many factors the massif which was original stable lost its stability. The process of landslide massif had been predicted and collected. Cause of the formation is ananyzed and the lessons are learnt in this paper.