Identification of subsurface basement rock using geoelectrical resistivity method in development area (campus 2 UIN Sunan Gunung Djati Bandung)

Abstract

The foundation is one of the important elements in the process of building a multistory building, where the foundation serves as the basic building that will support the main building weight above it. The foundation must be built and placed on a hard surface below the ground surface, this aims to avoid the shifting of the foundation which will cause damage to the building above it. One method that can identify hard layers is a type resistivity geolistrik method, which uses different rock resistivity parameters depending on the type of rock. To then be interpreted into a 2D geological section according to the state of the lithology of the area rocks. From the research data obtained, from 3 paths (L.1, L.2, and L.3) using the average Wenner configuration of the identified hard layers starting at a depth of 11.9 meters identified as a tuff stone layer (100-250 Ωm). Tufaan gravel layer and contains a little tufaan sand (250 - 400 Ωm) at a depth of 16.1 - 20.7 m, Tufaan gravel layer with breccia stone insect (400 - 600 Ωm) at a depth of 20.7 - 25.8 m, and the last of the basic constituent layers allegedly dominated by limestone (> 600 Ωm) at depths above 25.8 meters. While the position of the presence of an average hard layer is 96-144 meters from the starting point of measurement for each trajectory.