Simulasi Penggunaan Program Geostudio Slope/W 2007 dalam Menganalisis Stabilitas Lereng Dengan Jenis Tanah Lempung Berpasir pada Kondisi Tidak Jenuh, Kondisi Jenuh Sebagian, dan Kondisi Jenuh

Abstract

Landslide is a natural disaster that often occurs in Lampung Province, particularly in West
Lampung regency. The sliding occurs due to an increase in soil pore water stress in the rainy
season. Based on the research on the slopes, there is a safety factor value that can be used as a
reference for the degree of slope stability. One method to analyze the value of slope safety factor
is by using the Geostudio Slope / W 2007 program.
In this study, some cross sections of slope were simulated with 4 different water table conditions.
The required soil properties index are: cohesion, c; natural angle of repose, φ; and unit weight of
density, γ .
The analysis result shows that slope transversal cut shape have influence on slope stability. The
analysis results on slopes with saturated conditions have a safety factor value of <1.25 and are
classified on unsafe slopes. In the unsaturated condition the whole simulation is classified as a
stable slope with a safety factor value> 1.25. Based on the analysis result, it can be inferred that
the slope has insecured status. Thus, it is suggested to conduct such actions in order to prevent
landslide.
Key words : soil, slope stability, safety factor, geostudio slope/w.