A Case Study of Slope Stability Improvement in Central Bengkulu Landslide in Indonesia

The increase of landslide potential in the mountainous area in Central Bengkulu, especially Kelindang Village, is generally caused by the high rainfall intensity. The landslides had resulted in material, infrastructure, social, and economic losses. Therefore, slope countermeasure methods are needed to prevent the potential impact in the future. This study is initiated by performing site investigation, which is addressed to understand the general condition and soil sampling. Furthermore, the soil samples are tested in the laboratory to determine the physical and engineering properties, which are also used as the input parameters for finite element analysis. Several parameters such as factor of safety (SF) and the deformation under the existing condition and the countermeasure condition for the slopes are observed. Several alternatives of slope countermeasure such as controlling method and reinforcement method are studied. A logic tree analysis considering the environmental setting, factor of safety, experts’ availability, equipment mobilization, and workability is performed to determine the most suitable method. The results show that the suitable method for the study area is the combination between slope cutting and berm. Generally, the framework of this study can be implemented in other areas.