户宋河电站隧洞塌方的类型、原因及处理

Type, Cause and Treatment of Tunnel Collapse in Husonghe Hydropower Station

户宋河电站引水隧洞、导流洞、地下压力钢管道及施工支洞，在施工过程中，共发生冒顶大塌方４段，最大塌高＞３ｍ的大塌方及冒顶计１２段，小塌方及掉块很多。本文收集归纳了这些大小塌方的类型、原因及处理方法，并总结了经验。

Altogether 4 large collapses, 12 collapses with a height of over 3 m ,many small collapses and rockfalls happened during excavation of the power tunnel,the diversion tunnel,the underground penstock conduit and the construction adit. This paper describes the type, the causes and the treatment methods of those large and small collapses, and summarizes the experience in treatment.