Abstract: Based on the excavation and disclosure of the downstream slope of the right dam abutment of lower reservoir of Zhouning pumped storage power station in Fujian province, combined with analysis of structure characteristics of slope rock mass as well as the relationship between the structure planes and the excavation surface, traditional stereographic projection software is used to evaluate the stability of excavated slope. Moreover, two-dimensional modeling and analysis is carried out by use of discrete element program UDEC, and together with engineering geological conditions, the stability of excavated slope is comprehensively analyzed and evaluated. Without support, the safety factor of the potential rock composite of the slope under transient working conditions cannot meet the requirements from specifications. After completion of shallow support (including shotcrete, system anchor and anchor piles), the safety factor of the potential rock composite of the slope under transient working conditions can basically meet the requirements from specifications, but the safety margin is not high. The application of system anchor cable support has better control effect on the stability of the rock composite.

Key words: stability, rock slope, plane projection, numerical analysis

摘要： 根据福建周宁抽水蓄能电站下水库右坝肩下游侧边坡开挖揭露情况，通过现场实际地质编录分析边坡岩体结构特征、结构面与开挖坡面的关系，运用传统赤平投影软件进行开挖边坡稳定性评价；基于离散元程序UDEC进行二维建模和分析，结合工程地质条件对其稳定性进行综合分析评价。在无支护状态下，边坡潜在组合块体短暂工况安全系数不能满足规范要求，在完成相应的浅层支护后（包括喷混凝土、系统锚杆和锚筋桩，组合块体短暂工况安全系数可基本满足规范要求，但安全裕度不高，而施加系统锚索支护对组合块体稳定性有较好的控制效果。

关键词: 稳定性, 岩质边坡, 赤平投影, 数值分析