Abstract: The real time construction monitoring on the embankment slope is critical to the embankment slope stability during the constriction. An embankment slope in Longnan Expressway Project was real-time monitored with various geotechnical instruments. The slope inclinometers were mounted at the top of a retaining wall so that the displacement at the toe of the embankment as well as the lateral movement of the embankment could be measured. The deep settlement benchmarks, piezometers and rainfall gauges were installed at the site so that the groundwater level and precipitation at the site could also be monitored. The results indicate that, the embankment slope lateral deformation during the highway operation varied from 6 to 11 mm, the deflection in the vertical directions varied from 3 to 10 mm. and no obvious trend with time was developed. The deep settlement benchmarks measured deflections were reasonable and no obvious trend was identified. The rainfall range was between 0 and 25 mm. There were no obvious groundwater changes found. It is therefore concluded that the embankment slope is stable. 

Key words: slope monitoring, stability, internal deformation, surface displacement, groundwater level