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All Journal Jurnal Fisika Unand Jurnal Ilmu Fisika
Rudi Cahyadi
Department Of Physics, Universitas Andalas, Padang, 25163
Astronomy Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Quasi-3D Geoelectrical Imaging as A New Application for Landslide Investigations: A Tunnel Case Induced by Blasting Activity Cahyadi, Rudi; Widodo, Widodo
Jurnal Ilmu Fisika Vol 16 No 2 (2024): September 2024
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.16.2.177-186.2024

Abstract

Landslides are a significant hazard in mountainous regions, especially when influenced by construction activities such as tunnel excavation. In this paper, we aim to conduct a slope stability analysis as a result of tunnel blasts using quasi-3D subsurface models based on resistivity values. The study site is a construction area for the Jakarta-Bandung High-Speed Train tunnel, located in a mountainous region undergoing drill-and-blast excavation. This excavation method makes the area susceptible to landslides, which pose a threat to settlements in the Padalarang subdistrict, West Bandung Regency, Indonesia. Data was collected along four lines in 2D, and the dipole-dipole array was used to enhance resolution. Data modeling was carried out using ResIPy v3.2.3 software to create 2D and quasi-3D subsurface models based on resistivity values. The study findings indicate that the study area exhibits three resistivity ranges: low resistivity (0-30 Ωm), medium resistivity (31-49 Ωm), and high resistivity (>50 Ωm). Utilizing quasi-3D imaging, we were able to identify the dimensions and presence of slip surfaces, which can be categorized as shallow (1.5-5 m) and deep (5-20 m) criteria. This study successfully applied the quasi-3D geoelectrical approach in a susceptible environment to detect potential landslide zones.
Quasi-3D Geoelectrical Imaging as A New Application for Landslide Investigations: A Tunnel Case Induced by Blasting Activity Cahyadi, Rudi; Widodo, Widodo
Jurnal Ilmu Fisika Vol 16 No 2 (2024): September 2024
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.16.2.177-186.2024

Abstract

Landslides are a significant hazard in mountainous regions, especially when influenced by construction activities such as tunnel excavation. In this paper, we aim to conduct a slope stability analysis as a result of tunnel blasts using quasi-3D subsurface models based on resistivity values. The study site is a construction area for the Jakarta-Bandung High-Speed Train tunnel, located in a mountainous region undergoing drill-and-blast excavation. This excavation method makes the area susceptible to landslides, which pose a threat to settlements in the Padalarang subdistrict, West Bandung Regency, Indonesia. Data was collected along four lines in 2D, and the dipole-dipole array was used to enhance resolution. Data modeling was carried out using ResIPy v3.2.3 software to create 2D and quasi-3D subsurface models based on resistivity values. The study findings indicate that the study area exhibits three resistivity ranges: low resistivity (0-30 Ωm), medium resistivity (31-49 Ωm), and high resistivity (>50 Ωm). Utilizing quasi-3D imaging, we were able to identify the dimensions and presence of slip surfaces, which can be categorized as shallow (1.5-5 m) and deep (5-20 m) criteria. This study successfully applied the quasi-3D geoelectrical approach in a susceptible environment to detect potential landslide zones.
Studi Komparatif Triangular dan Quadrilateral Mesh pada Inversi Geolistrik 2D Wenner-Schlumberger untuk Zona High resistivity di Terowongan 11 Padalarang Rudi Cahyadi; Widodo, Widodo
Jurnal Fisika Unand Vol 14 No 6 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.6.546-553.2025

Abstract

This study aims to compare the results of 2D electrical resistivity inversion using triangular and quadrilateral mesh types in the Wenner–Schlumberger configuration to identify high-resistivity zones at Tunnel 11, Padalarang. Data acquisition was performed using 48 electrodes with a 10 m spacing and an ARES II multichannel resistivity meter. Data inversion was conducted with the ResIPy software employing two different mesh approaches. The results show that the triangular mesh produces smoother models, better adapts to topography, and achieves lower root mean square (RMS) errors (1.09–1.12%) compared to the quadrilateral mesh (4.67–4.72%). High-resistivity zones (>60 Ωm), interpreted as andesitic basalt, were identified at depths greater than 25 meters. The extent of these zones increases from Line 2 to Line 1, which has implications for blasting or drilling strategies during tunnel construction. These findings indicate that triangular mesh is more effective for complex geological conditions.
Co-Authors Widodo Widodo Widodo Widodo