Abstract:In view of the instability and failure of embankment slope caused by the rising, continuing and falling of flood water level in flood storage and detention area, the process of flood on the embankment slope was simulated through indoor model test. Combined with GEO-Studio (coupling of SLOPE/W and SEEP/W) program, an equivalent medium continuity model was established in this study. Based on the saturated-unsaturated seepage theory and limit equilibrium method, the changes of pore water pressure, dynamic changes of phreatic line and safety factor of embankment slope in flood area are studied. The results show that the variation of pore water pressure and volume water content of indoor test and model simulation are consistent. The phreatic line would rise with the rise of water level in the rising stage, develop to the inside of the slope in the soaking stage, and gradually decreases with the decrease of water level in the recession stage. During water level change, the slope stability would increase with the rise of water level, decreases with the decrease of water level in the soaking stage, and the stability decreases rapidly in the stage of water recession.