Abstract: The performance of geogrid in the high reinforced soil slope (RSS) is a very important and practical topic in the geotechnical engineering. This paper presents a case history of a 65 m high RSS slope with a slope angle of  degree. The earth pressures, deflections inside the slope and the surface movement of the slope as well as the strain in the grogrid are monitored during the construction. The results show that, the maximum vertical earth pressure is not located at the bottom of the fills. With the location that far away from the slope surface, the maximum vertical earth pressures are gradually moving downward. The lateral deflection of the slope are not linear with a maximum lateral deflection of 20 mm is recorded at 22 m below the crest. Deformations at the top as well as the bottom of the RSS are small. The maximum strain within the geogrid is at the half height of the retaining wall at bottom with a magnitude of 2.32 mm or 6.65% of strain. This indicates that the maximum tension stress has not been reached.

Key words: reinforced soil slopes, geogrid, construction monitoring, shennongjia airport