QUASI 3D OF ERT 2D DATA USING RESIPY AND SLOPE STABILITY ANALYSIS ON THE WEST SIDE OF MT. BOHONG, PADALARANG

• Main Author: Cahyadi, Rudi
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/57562
• Institution: Institut Teknologi Bandung

A quasi 3D of 2D ERT data to determine the presence of a slip plane on the west side of the 11th tunnel is performed by using ResIPy software. First, 2D inversion is applied on each line based on Wenner-Schlumberger and Dipole-dipole electrode configurations. The research area shows three resistivity groups, with a low under 30 ohms, a medium between 31 to 49 ohms, and high resistivity of up to 50 ohms. Boreholes sample data are confirming it and that layers indicate three types lithological at depths of up to 20 m. Based on quasi 3D, it is known that the dimensions from the surface to the interior of the slip plane that has shallow (1.5 - 5 m) and deep (5 - 20 m) depth criteria. Based on slope stability analysis according to PPV and PPA data, the maximum recommended PPV value is 2.28 mm/s for the closest distance of 130 m from the blasting point. With PPA 0.027 - 0.086 g, at a distance of 130–500 m, the estimated Dynamic Safety Factor (DSF) values on the west side of Mount Bohong are 1.167 – 1.333. The DSF values have met the minimum Indonesian National Standard threshold.