DefinePK

Abstract

Mountainous area of southern South Sulawesi Province, Indonesia is prone to landslides. During 2009 to 2013 more than 50 landslides have occurred causing road connecting MalinoGowa Regency to ManipiSinjai Regency heavily damaged. The aim of this research is to find out the influence of engineering geological aspect against landslide susceptibility in the study area. The research uses field survey method consisting of: characteristic study of tuff weathering profile: determining water content, infiltration rate and shear strength of weathered rock and residual soil, as well as laboratory analysis covering petrographic analysis of fresh rock composition. Field survey result indicates that tuff profile consists of six stages including unweathered tuff (fresh), slightly weathered tuff, moderately weathered tuff, , highly weathered tuff, completely weathered tuff, and residual soil. Most tuff mineral compositions are volcanic glass. The more the weathering stage increases, the higher the water content and infiltration rate. Conversely, the shear strength becomes low. Under this condition, landslide becomes susceptible.