Geomechanics and Engineering

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Electrical resistivity survey and interpretation considering excavation effects for the detection of loose ground in urban area

  • Seo Young Song (Department of Energy and Mineral Resources, Sejong University) ;
  • Bitnarae Kim (Department of Energy and Mineral Resources, Sejong University) ;
  • Ahyun Cho (Department of Energy and Mineral Resources, Sejong University) ;
  • Juyeon Jeong (Department of Energy and Mineral Resources, Sejong University) ;
  • Dongkweon Lee (His Earth co. ltd.) ;
  • Myung Jin Nam (Department of Energy and Mineral Resources, Sejong University)
  • Received : 2023.04.07
  • Accepted : 2023.08.02
  • Published : 2023.10.25
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Abstract

Ground subsidence in urban areas due to excessive development and degraded underground facilities is a serious problem. Geophysical surveys have been conducted to estimate the distribution and scale of cavities and subsidence. In this study, electrical resistivity tomography (ERT) was performed near an area of road subsidence in an urban area. The subsidence arose due to groundwater leakage that carried soil into a neighboring excavation site. The ERT survey line was located between the main subsidence area and an excavation site. Because ERT data are affected by rapid topographic changes and surrounding structures, the influence of the excavation site on the data was analyzed through field-scale numerical modeling. The effect of an excavation should be considered when interpreting ERT data because it can lead to wrong anomalous results. A method for performing 2D inversion after correcting resistivity data for the effect of the excavation site was proposed. This method was initially tested using a field-scale numerical model that included the excavation site and subsurface anomaly, which was a loosened zone, and was then applied to field data. In addition, ERT data were interpreted using an existing in-house 3D algorithm, which considered the effect of excavation sites. The inversion results demonstrated that conductive anomalies in the loosened zone were greater compared to the inversion that did not consider the effects of excavation.

Keywords

Acknowledgement

The research described in this paper was financially supported by Korea Spent Nuclear Fuel (iKSNF) and Korea Foundation of Nuclear Safety (KOFONS) grant funded by the Korea government (Nuclear Safety and Security Commission, NSSC) (No. 2109092-0121-WT112) and Korea Environment Industry & Technology Institute (KEITI) through Subsurface Environmental Managements (SEM) Projects, funded by Korea Ministry of Environment (MOE) (NO. RS-2023-00230833).

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