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

摘要

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.l,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.