Abstract
The slope is a ground has a certain angle to the horizontal plane. The stability of slope depends on the magnitude of the retaining force and the driving force present in the slip. Characteristics of soil mass are determined by laboratory test of core drilling method is conducted to determine the subsurface condition at the area of study. Assessment of slope stability is using limit equilibrium method with comparing Bishop, Janbu, and Spencer method using Slide 6.0 Program. In this study area is composed of clay with the firm to stff structure. The result of the analysis slope stability using manual method using Bishop simplified method obtained the factor of safety is 1,680 and 1,14 and based on Slide 6.0 program, the Janbu simplified method is resulting the smallest factor of safety 1,130. Therefore it can be classified as unstable condition according to the terzaghi and peck (1976) factor of safety criteria. It means that reinforcement is required to improving the slope stability. Then, the result of analysis provide information that simulation model using micropiles reinforcement is the most effetive to improving the factor of safety value. The increasing of safety factor became 1.630 on treated slope using micropiles with the space between piles is 1 m.
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