The purpose of this paper is to analyze the stability of cut slope reinforced by earth retentionsystem according to reinforcement stages by use of a numerical program. The large-scale cut slope is locatedin the express highway construction site. During partial cutting slope for the construction of bridge foundation,tension cracks were occurred and slope movement was monitored. To improve the stability of failed slope,variousearth retention systems such as stabilizing piles,anchors and nails were designed and installed in the upper andlower parts of slope through six stages. In order to ensure and check the stability of slope reinforced by earthretention systems,the slope stability analysis using a limit equilibrium method were performed according to sixreinforcement stages. As the result of stability analysis,the safety factor of slope and the deflection of stabilizingpiles were varied according to reinforcement stages. The most critical stage during slope reinforcement wasmodification and excavation stage for installation of nails. Also,the deflection of stabilizing piles was decreasedafter installation of nails and anchors due to increase resisting force of slope. This paper may be very useful tounderstand the stabilizing effect of earth retention system during reinforcement stages.
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