Abstract: The optimization process can be applied into the reinforced soil slopes. This paper presents the analyses of several reinforced soil designs for the same slope based on the pullout test results and different limit equilibrium analysis methods. The optimized design that meets the stability is then selected. The results indicate that, the factor of safety obtained by improved Swedish method or Dutch Method have close results but both results are high than the original Swedish Method. The seismic and groundwater condition have large impact f the stability of the reinforced soil slopes. The Ministry of Water Resources suggested method has a prominent effect of the foundation stability of the reinforced soils. A reasonable reinforcement can be readily obtained. Full length distribution of geogrids is recommended when the groundwater table is high. The stability of doublelayer reinforcement is obviously higher than that of single layer but the stability is not a simple superimpose of two layers of reinforcement. The location has limited effects for single layer reinforcement. The cost reduction can be achieved by placing the single reinforcement at the middle portion of the slope. The further comparisons indicate that the potential failure plane will change before and after the geogrid reinforcement regardless of the reinforcement scheme.

Key words: Geogrid, Reinforced Soils, Stability Analysis, Optimization Design