Perpustakaan Digital ITB

Slope stability analysis is generally conducted in 2 dimensions without considering the width of the slope, 3- dimensional slope stability analysis considers the width of the slope. Factor of safety calculation is carried out in laterite nickel open mine by simulating variations in width, height, and slope angle to determine the ratio of width to height of the slope. This simulation is carried out under static and dynamic conditions, considering the seismic load. The type of failure analyzed in this study is circular, with Bishop limit equilibrium method (Bishop, 1954), and using Rocscience Slide2 and Slide3 for 2-dimensional and 3-dimensional analysis. The analysis results show the width of the slope in 3-dimensional slope stability analysis greatly influences the FS value of limonite, saprolite, and bedrock materials. The 3-dimensional FS value is greater than the 2-dimensional FS value because the 2-dimensional analysis assumes that the slope width is unlimited, while the 3-dimensional analysis is limited thus has different slip surface. The 3-dimensional analysis is more suitable for detailed slope analysis due to the capability to model the rock lithology, slope geometry, and discontinuity more accurately than 2-dimensional analysis. However, the 2-dimensional analysis is still needed for more general analysis.