Abstract: The slope stability analysis is a complicated process, and the stability of the different slopes are affected by different factors. The stability of fill embankment is influence by the height of the slope, slope angle, type of embankment material, age of the embankment and the groundwater conditions. This paper presents the stability analysis results of the backfill embankment for a former gravel quarry by using the transfer function method. The stability before and after improvement of the south side fill embankment of the Shuixi section of Guangzhou Metro No. 21 Line was evaluated and the mitigation methods was recommended. The effectiveness of the proposed supporting structure was validated throughout using the commercial analytical software. The results indicate that, the transfer function method can be used for the global stability of the backfill embankment. The location of supporting and magnitude of the forces in the supporting structure can be identified through the transfer function method.

Key words: Transfer Function Method, Slope Stability Analysis, Fill Embankment, Supporting Structure