Mujahid Hizri Hanifa
Java Island is one of the islands that have many volcanoes that resulted in frequent soil residues found in the form of volcanic eruptions. This type of residual soil if in a state of unstable and located in hilly or mountainous areas can lead to landslides, so to avoid it should be done a stable slope simulation which became the origin of the idea in making this thesis. In the process of compilation, divided into 2 stages, the first is the field research phase to take the slope data and take soil samples for further testing in the laboratory. The second stage is the laboratory and studio test stage. At this stage, some tests to determine the physical and mechanical properties of the soil are also analyzed using software using field data and laboratory test results data.
This stable slope test uses groundwater difference and terracing making to obtain stable slope safety factor. In the test using groundwater, tested with 6 different depths, i.e. 5m, 10m, 15m, 20m, 25m and 30m. And the results of the 5m depth analysis resulted in the crisis slope while the depth of 10m to 30m resulted in stable slopes. In the test using terraces made simulated with the number of terraces from 1 to 7, from the simulation it can be concluded that from terraces 1 to 3 produce a crisis slope, while terraces 4 to 7 produce stable slopes.
Keywords: slope safety factor, stable slope, ground water level, terrace, Ciletuh