The stability of a cut slope subjected to staged reinforcement has been investigated using field monitoring and slope modeling. The slope reinforcements used include piling, nailing, and reinforced soil wall and these were installed in the upper and lower parts of the slope in six stages. To analyze changes in the stability of the reinforced slope during these stages, an instrumen-tation system was installed and monitored carefully. It was observed that the safety factor of the slope and the deflection of the stabilizing piles varied significantly as the reinforcements work pro-cessed. The most critical stage was observed to occur during the soil-nailing stage. The safety factor of the slope is gradually increased, subjected to reinforcement stages and satisfied with the allowa-ble standard values in both dry and rainy conditions.
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