Slope stability analysis using GEO5 in Gurabesi Village Papua Province based on limit equilibrium method.

Slope stability problems are quite common and widespread in many civil engineering projects. The uncertainty in the calculation of slope stability results from several sources in particular; the geotechnical properties of soils have several components of randomness. It causes the landslide disaster even more complex. Characteristics of Papua Province is a mountainous area with wavy and steep reliefs. This can cause landslides at some points. From this background, mitigation efforts are needed to prevent landslides from happening in the future. Recent mitigation efforts had not solved the stability problem. There are several locations that have slopes that are prone to landslides, one of which is a slope located in the Gurabesi Village area. Therefore, it is necessary to conduct research to assess slope stability conditions. This paper presents the analysis of current slope stability based on the geotechnical investigation. This research uses GEO5 software to simplify the analysis process. GEO5 is an application that can perform slope stability analysis based on the Limit Equilibrium Method by producing an output in the form of a safety factor value based on several parameters. Conventionally, the analysis is performed in conditions where the soil is intact. The most important parameters are unit weight, angle of internal friction, and the value of cohesion of its soil. Also, choosing the appropriate method is essential in modeling the slope failure mechanism. This paper describes, discusses, and compares results from five different methods for slip surface analysis using Bishop, Fellenius, Janbu, Morgenstern-Price, and Spencer methods. Results of slope stability analysis using the Limit Equilibrium Method indicate that the slope is in critical condition, with a factor of safety below 1,0. Based on the analysis results, some recommendations given to reduce the future landslide hazard in that area. One of the solutions to prevent future slope failure is to build a retaining wall. [ABSTRACT FROM AUTHOR]