Surface monitoring of a failure slope by terrestrial laser scanning

This paper presents surface monitoring of a failure slope, which was located along the Halong-Vandon highway. Terrestrial laser scanning was adopted to scan the slope surface twice at the time that failure occurred and one year later. Whole slope surface could be scanned completely. Results show that the subsided area was about 5600 m2, at which ground settlement took place seriously at the center line of the area and slightly near boundaries. The slope surface settled down about 1 m at the first time scanning. Then, the development of ground settlement became slow and the maximum settlement increment was about 0.5m at the second time of scanning. Besides, the finite element method was adopted to model the slope surface settlement and compare with that was recorded at the first time of scanning.