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

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