Seepage Stability Evaluation for Dams of Fuhuashan Reservoir

Based on the particular case of Fuhuashan Reservoir, a seepage stability evaluation for dams of Fuhuashan Reservoir was carried out comprehensively by analysis of monitored data of the main dam, seepage field of two dams with finite element method (FEM) and analysis of their operation behaviors. The result shows that the seepage stability of abutments of the main dam cannot reach the technical criteria because of the thick strongly-weathered bed, and there maybe exist seepage stability problem in the main dam body because maximal average seepage gradients exceed the tolerance levels under various operating modes. In the foundation of the main dam there is not obvious leakage. Spill points of saturated lines of the secondary dam are in the downstream slope of dam under computation operating modes, and there exists leakage problem in two abutments and the foundation of the secondary dam. It is suggested that the impervious-drain system and safety monitoring facility should be improved, the safety monitoring and rational operation management should be strengthened, to ensure the safety of reservoir operation.