Abstract: Through the limit equilibrium method to study the influence of different factors such as embankment backfill material, embankment height, slope angle and other factors on the stability of the special soil embankment. The results of this study show that the embankment height has a significant impact on the stability. The lower slope angle, the better the stability of the expansive soil embankment. The slope ratio of 1∶1.5 to 1∶1.75 is more adequate as the embankment slope angle. The influence of natural ground slope on the embankment slope stability is small; increasing the internal friction angle of the embankment material can correspondingly improve the stability safety factor of the embankment, but when the strength of the natural ground exceeds the strength of the backfill material of embankment, increasing the internal friction angle of the natural ground soil is not effective to improve the stability safety factor of the embankment.

Key words: Limit Equilibrium Method, Roadway Embankment, Stability Analysis