Abstract: According to the preliminary geological investigation, there were three faults, namely f₂₈, f₃₉ and f₄₄ developed at the dam abutment on the left bank of the lower reservoir of Zhouning pumped storage power station. f₂₈ extended along the slope with a dip angle of 15°~20°, and its combination with the faults f₃₉ and f₄₄ which also extended along the slope with steep dip exerted an adverse influence on the stability of the slope. Thus, engineering treatment was required. Later in the implementation stage, only the fault f₃₉ was revealed in the actual excavation, while faults f₄₄ and f₂₈ were not seen. The slope stability was better than the original evaluation. By reanalysis of slope stability and adjustment of the support form, the project cost was cut down and the construction period was shortened.

Key words: Zhouning pumped storage power station, slope at the left abutment, fault, slope stability,  , support adjustment

摘要： 根据前期地勘成果，周宁抽水蓄能电站下水库左岸坝头发育f₂₈、f₃₉、f₄₄等三组断层，其中f₂₈顺坡向，倾角15°～20°，与f₃₉、f₄₄两组顺坡陡倾角断层相互组合，对边坡稳定不利，需要工程处理。技施阶段，根据实际开挖揭露的地质条件，坡面仅见f₃₉断层揭露，未见f₄₄和f₂₈断层穿过，边坡稳定性变好，因此重新对边坡进行了稳定分析，并对支护形式进行了调整，节省了工程投资及建设工期。

关键词: 周宁抽水蓄能电站, 左坝头边坡, 断层, 边坡稳定, 支护调整