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 

摘要： 基于某水电站拱坝工程的监测结果，分析该拱坝在首次蓄水期初期的变形、渗流及应力应变等的变化规 律和分布特征，进而评判拱坝的运行工作性态。监测结果分析表明，该工程坝体及坝基的变形量较小且正常，应 力分布合理且蓄水后变化符合拱坝低水位运行特征，基础渗压分布合理，渗流量总体较小。变形、渗流及应力应 变实测值均在设计控制指标范围内，因此可判断该工程拱坝在首次蓄水期初期的工作性态正常，基本满足设计 要求。

关键词: 首次蓄水期, 安全监测, 设计控制指标, 工作性态