Relationship between resistivity and soil strength based on geoelectric data

Abstract

Geoelectric method was applied in geophysical research to know the relationship between resistivity with soil strength based on geoelectric data has been conducted at Cassa Villa Jimbaran, Badung, Bali. The study lies in the position of 8°46'50,6 LS and 115°10'02,6 BT. The data was collected by injecting an electric current inside the Earth's surface using a Wenner configuration with a path length of 148.8 meters. The data was processed using SiberTool Software to export *.d2d to *.dat file. Therefore, it can be read by Res2dinv software. The further data was processed using Res2dinv for data inversion. Thus, it was able to show the contour of the cross-section of the trajectory. The research result was obtained resistivity value at position 51.15 was 6, 40 - 11, 98 ?m. The data of the soil strength was applied Standard Penetration Test (SPT) method by drilling and taking soil samples then testing in the laboratory. The soil sample was taken at position 51.15. The soil strength test result was obtained about 6 - 5, 3 (kg/cm) ^2 at a depth of 0, 58 - 20, 0 meters. The two magnitudes were analyzed to find the relationship in the form of the two poly nomialorde y=-60,811 x^2+1433,4 x-8442,4 with correlation coefficient value 0, 9799. It means there was a correlation between resistivity values with soil strength. It is as well as to define the soil strength value can be reviewed based on resistivity especially limestone soil.