Susceptibility of the Surrounding Soil and Rock by the Electrical Resistivity Method

Abstract

The research area is located in Banga, Soppeng Regency, South Sulawesi Province. The purpose and intent of this research is to determine the resistivity value of the material layer, identify the characteristics of the slip plane and its relationship to the plasticity properties and the characteristics of the clay minerals contained in the soil. The method used to collect field data includes surface geological data and subsurface geology, which are the electrical resistivity data and surface soil data, then interpreted by combining topographiccross-sectional data and subsurface geoelectrical data along the measurement path. The first slip plane is curved as well as the second slip plane is the residual soil resulting from weathering of limestone which is still above the less dense and thick parent rock (in situ). The geochemistry of the soil samples showed that the mineral content in each layer had the largest percentage of illite 54.4% - 69.9%, and montmorillonite 6.1% - 13.6%, these two clay minerals have large shrinkage properties. Plasticity Index 29.8% - 35.8%, causing vulnerability to the soil, so that the mass movement on the sliding plane is moderate and active in slow motion. The mass movement in the slip plane can be categorized into creep type.