Abstract: This paper presents a case history of the post construction deformation monitoring results of a geofoam filled embankment in Changbao Expressway Project in Baoshan City. The project is located in high slope mountainous area with high seismic intensity area in southwest of Yunnan Province with a maximum embankment height of 15 meters. The deformation in the geofoam embankment was monitored and the post construction deformation is presented in the paper. The results and conclusions are the monitored settlement data at highway subgrade, lateral deflection at slope surface and lateral deflections at 0.5 meters and 3.8 meters below the toe of embankment slope. The maximum post construction settlement at highway embankment is 39.87 mm under an embankment height of 13.5 meters. The lateral deflection at slope surface is 8.12 mm and the lateral deflections at 0.5 m and 3.8 m below tow of embankment slope are 2.46 and 3.67 mm, respectively.

Key words: Embankment with High Slope Angle, Geofoams, Deformation, Subgrade, Toe of Slope