Raghuvanshi Tarun K. (PhD)Molla Samuel2018-07-102023-11-092018-07-102023-11-092011-04http://10.90.10.223:4000/handle/123456789/7670Rainfall triggered landslides is a common problem in many areas; along road cuts, hilly and mountainous regions of the highlands of Ethiopia. In the Blue Nile gorge, landslide is a common problem for last many years, especially during the rainy seasons. Slope instability problems in the form of rock fall, landslide and complex disturbances are the common events in the area on the sides of the main road from Gohatsion to Dejen. Detailed slope stability studies along this road will give opportunity to deal with the different mode of failure separately and to provide the best remedial measures for the different slope sections independently to protect failure of structures and loss of life because of the slope instability problems. For the present study a detailed slope stability analysis was carried out for a critical slope section which falls 15 km short of Dejen town about 215km from Addis Ababa. For the study, both primary and secondary data were used. The primary data was collected from the field work measurements and the observations. The secondary data used for the present slope stability analysis were collected from the GSE and JiCA teams working on the landslide problem along the road from Gohatsion to Dejen. Sensitivity analysis was also performed to estimate the shear strength parameters (cohesion and internal friction angle) for the detail slope stability analysis. The deterministic slope stability analysis approach was followed to perform the detailed slope stability analysis of the selected slope section in the present study. In the present study factor of safety for the selected slope section was determined for the different conditions using SARC software. In addition, SLOPE/W software was also used to determine the factor of safety for the present condition under static state. The results of the slope stability analysis clearly indicate that the slope section is stable only for the dry condition under static state with a FOS of 1.28. For the other conditions, both under static and dynamic state, the slope section will be unstable with a FOS less than 1.0. The factor of safety for the dynamic state for worst condition is even less than 0.5. Thus, finally based on the slope stability analysis findings for existing and anticipated worst conditions suitable remedial measures were worked out.enLegedadi & Dire Reservoir CatchmentThesis