Theoretical Models of Slope Stability Analysis in The Maqlub Mountain Rock Cut Routes, North Iraq

  • Azealdeen Salih Al-Jawadi Dams and Water Resource Researches Center, University of Mosul, Iraq
Keywords: Rock cuts, Theoretical model, Slope stability, Engineering investigations, Stereographic analysis


In many sections, the road leading up to the top of Maqlub Mountain is dangerous due to the fall of several rocks. There were six locations recognized for this dynamic geological process, rockfalls of varying sizes, with very large measurements up to 230 x 120 x 110 cm are falling on the road. The study suggested three theoretical models explain the causes of rockfall, through a ‎comprehensive study in the area. The first model showed that the cause of rockfall was the presence ‎of rocky slopes with a reverse slope. The second model has shown that the rockfall is caused by weak engineering properties of marl beds and it can be squeezed under thick and fractured ‎beds of hard and fractured limestone rocks. The third model determined the small area of the rock base at the rocky slope surface and its large height that reduced their stability. A field survey was performed to study an area that included measuring the height and inclination of the slope surface and measuring the attitude of all discontinuities and their engineering characteristics to classify the slope stability, as well as the technical parameters of the road that determine the risk and consequence factors. Two computer programs were designed to evaluate slope stability, one used to classify risk and consequence (Rockfall Hazard Rating System Program) and the other to classify slope stability based on its geotechnical properties (Slope Mass Rating System Program) in addition to the areas where a rock climb previously occurred, the study concluded that dangerous sites have been recognized along the road to Maqloub Mountain. ‎The size of the falling rock cuttings was classified between small and medium size. ‎The study indicated that this road requires support in hazardous locations to prevent accidents causing losses of property and humans.