International Journal of Engineering and Technology

In this paper, we present an analysis of slope stability using Geographic Information Systems (GIS). The methodology is based on the calculation of the safety factor in 2D and 3D using GIS. Hovland's Method in 3D and 2D have been used in the stability analysis of the slope located at the 34 kilometer point (KP.34) on the highway in the North of Morocco connecting Tangier to Ksar Sghir. Isohypse and the digital elevation model (DEM) of the studied site have been built from topographical surveys. Results shows that the safety factors (FS) obtained in 3D analysis are about 11 % higher than those obtained in 2D analysis and the slope becomes unstable when the water table level is below 1m.