Abstract: The lightweight foamed concrete has the advantages of light in unit weight, good fluidity, good construction, and has excellent required strength and overall stability. Therefore, it is an efficient way to apply the lightweight foamed concrete to replace and reduce the surficial load in the hazard mitigation of the high fill embankments. Due to improper construction of these high-fill embankments, the potential hazards often endanger the stability of the embankment slope. By using the combination of the deep borehole displacement monitoring and geological survey results, the potential sliding surface is able to be determined and analyzed. The stability verification analysis was performed by using the GEO software. The status sliding body was able to be back analyzed. The inverse analysis based on the required factor of safety by the design code, the inverse sliding body index is used to estimate the depth of lightweight foamed concrete required, so as to ensure the safety and reliability of high-fill embankment.

Key words: Stability, Lightweight Foamed Concrete, Embankment Hazard, Sliding Surface