ABSTRACT
This chapter aims to analyze the stability of cut slope reinforced by earth retention system according to reinforcement stages by use of a numerical program. To improve the stability of failed slope, various earth retention systems such as stabilizing piles, anchors and nails were designed and installed in the upper and lower parts of slope through several stages. In order to ensure and check the stability of slope reinforced by earth retention systems, the slope stability analysis using a limit equilibrium method were performed according to several reinforcement stages. The slope stability according to the reinforcement stages is investigated analytically by one of limit equilibrium method. The safety factor of slope gradually tends to be increased according to reinforcement stages. Especially, the most critical stage during slope reinforcement is the stage of excavating the slope to install the soil nails.
