关键词: 首次蓄水期, 安全监测, 设计控制指标, 工作性态

Abstract: Based on the monitoring results of the arch dam of a hydropower station, the variation law and distribution characteristics of deformation, seepage, stress and strain of the arch dam during initial im ⁃ poundment period are analyzed, then its working behavior is evaluated. Monitoring results show that the deformation of dam body and dam foundation is small and normal, the stress distribution is reasonable and its variation after impoundment accords with the operation characteristics of the arch dam under low water level. As well, the seepage pressure distribution of foundation is reasonable, and the seepage flow is small. The values of deformation, seepage, stress and strain are all within the range of design con ⁃ trol indicators. Therefore, it can be judged that the working behavior of the arch dam during initial im ⁃ poundment period is normal and basically meets the design requirements.

Key words: initial impoundment period, safety monitoring, design control indicator, working behavior