Abstract: To set up small units after construction, diversion steel pipes were embedded in construction branch tunnel of diversion tunnel of Shanxi hydropower station. Blind plug was used for plugging at the end, thus, long-term water environment may cause corrosion even water gushing, which was a threat for safety operation of switching station and the power house. To eliminate the threat, the second stage plugging design was carried out and presented in this paper, for reference.

Key words: Shanxi hydropower station, diversion tunnel, construction branch tunnel, plugging design

摘要： 珊溪水电站引水隧洞在建设期为了后期布置小机组，在施工支洞预埋了一段引水钢管，端头用闷头封堵，洞内常年积满水，现长期处于水下，极有可能会因为环境潮湿而锈蚀等原因发生渗漏甚至涌水等事故，严重威胁到开关站和发电厂房的运行安全。为了消除原封堵体预埋钢管运行期间的安全隐患，开展该封堵段的二期封堵处理设计探讨。

关键词: 珊溪水电站, 引水隧洞, 施工支洞, 封堵设计