Abstract: The uplift pressure in the foundation of power house and of the dam sections at both banks of a hydropower station is high, and the seepage pressure coefficients are larger than the designed control index. By field test on piezometer tubes in foundation, it is found that they are working alright and measured uplift pressure is reliable. The qualitative analysis of the uplift pressure in dam foundation and the quantitative analysis of statistical model show that the uplift pressure is mainly affected by the upstream and downstream water level, and there is no unusual trend in the current change and no possibility of sliding instability either. However, it is still necessary to strengthen the monitoring analysis and site inspection, which provide basis for the operation and management of the project in the later stage.

Key words: dam foundation uplift pressure, field test, seepage pressure coefficient, statistical model

摘要： 某水电站厂房及两岸岸坡坝段的坝基扬压力偏高、渗压系数超出设计控制指标。对各坝基测压管进行了现场测试，测压管工作状态较好、扬压力测值可信。经坝基扬压力定性和统计模型定量分析，发现其主要受上下游水位影响，且目前变化无异常趋势，未见抗滑失稳可能，但仍需继续加强监测分析及巡视检查，可为工程后期运行管理提供参考。

关键词: 坝基扬压力, 现场测试, 渗压系数, 统计模型