Abstract: The stability of fill embankment is an important topic in the geotechnical engineering field. This paper presents a case history of stability analysis of sliding resistant caisson improved embankment using strength reduction approach. The effect of embankment different dilatant angles on the embankment stability was investigated. The results indicate that, at the beginning of the failure, a plastic zone was developed at the toe of embankment and the plastic zone would progressively develop upward and formed a continuous plastic zone when the embankment is failed. The dilatant angle of embankment soil has a significant effect of the embankment stability. The factor of safety increases with the dilatant angle. Using the sliding resistant caisson can effectively improve the development of plastic zone above the caisson and therefore improves the embankment stability.

Key words: Embankment Stability, Strength Reduction Method, Factor of Safety, Dilatant Angle, Sliding Resistant