Sensitivity Analysis of Soil Parameters on Slope Stability using Simplified Bishop Method (Case Study in Grobogan, Central Java, Indonesia)

Abstract

Slope instability can occur due to the influence of soil parameter values. The value of soil parameters is a random phenomenon that is uncertain and tends to a certain range. This study attempts to analyze the sensitivity of soil parameters on a slope with a height of 6 m. Sensitivity analysis includes several ranges of soil parameter data based on the Soil Investigation Report in Grobogan, Central Java, Indonesia. Slope failure is based on Mohr-Coulomb theory and slope stability analysis using simplified Bishop method. The analysis will produce how much influence from the variation of soil parameter values to the safety factor on the slope. The results of the influence of the variation of parameter values are recapitulated and processed, so that the sensitivity percent of each soil parameter is obtained against the safety factor of slopes. The results showed that the most sensitive soil parameters were soil cohesion.