Technical and Economical Comparison of Different Methods of Temporary and Sustainable Stabilization of Soil Slopes (Case Study: Science and Research Branch-Islamic Azad University)

One of the important issues in the slope stabilization especially in urban spaces, roads etc. is the technical, economic, environmental and space constraints, which impose particular conditions on any project. Undoubtedly, seismic evaluation is one of the most important issues in this field, and the study of dynamic stability and reinforcement of slopes against earthquake hazards can prevent many mortal and financial losses. In this paper, the stability of the slopes in the northwest of Tehran located at the Islamic Azad University Science and Research Branch, which is adjacent to access roads and structures, has been investigated in static and dynamic conditions using the ABAQUS software based on finite element method. In addition, by using four methods of stabilization including soil nailing, anchor, reinforced retaining wall with geogrid and gabion, the slope stability has been analyzed by investigating and comparing the coefficient of safety factor and reliability, deformation and failure mechanism and also, the economic analysis of construction in two cases without and with stabilization. Based on the obtained results, it can be concluded that in addition to the soil resistance parameters, slope geometry and stabilization method have a significant role in the dynamic responses and among the technically and economically investigated methods, the stabilization using reinforced retaining wall with geogrid, increases the reliability and safety factor and provides sufficient sustainability which led to reasonable execution costs.