Abstract: This paper presents the stability analysis of the landslide at a highway on top of the river levee. The effect heavy precipitation and the river water level fluctuations on the stability of the highway embankment are investigated through the numerically analysis and through the geological survey. The results indicate that the failure mode of the landslide belongs to the circular failure mode. The precipitation, flood erosion on the river bank and the rapid drawdown of the flood level are factors that might contribute to the occurrence of the landslide. Among these potential factors, the rapid drawdown of the flood level has the most influence on the embankment stability. This study could provide some references of stability of levees along the frequently flooded area.

Key words: Landslide, Instability Mechanism, Flood Level, Finite Element Method, Stability