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http://dx.doi.org/10.5467/JKESS.2013.34.3.195

A Case Study of Electrical Resistivity and Borehole Imaging Methods for Detecting Underground Cavities and Monitoring Ground Subsidence at Abandoned Underground Mines  

Choi, Jeong-Ryul (Department of Geology and Earth Environmental Sciences, Chungnam National University)
Kim, Seung-Sep (Department of Geology and Earth Environmental Sciences, Chungnam National University)
Park, Sang-Kyu (HanSe Geo Engineering)
Shin, Kwang-Soo (Mine Reclamation Corp.)
Kang, Byung-Chun (Sanha Engineering and Consultant)
Publication Information
Journal of the Korean earth science society / v.34, no.3, 2013 , pp. 195-208 More about this Journal
Abstract
We employed electrical resistivity and optical borehole imaging methods to identify underground cavities and determine ground subsidence rate at the study area affected by land subsidence due to abandoned underground mines. At the study site 1, the anomalous zones of low resistivity ranging between 100 ohm-meter and 150 ohm-meter were observed and confirmed as an abandoned underground mine by subsequent borehole drilling and optical borehole imaging. Although the electrical resistivity survey was unavailable due to the paved surface of the study site 2, we were able to locate another abandoned underground mine with the collapsed mine shaft based on the distribution of the ore veins and confirmed it with borehole drilling. In addition, we measured vertical displacements of underground features indicating underground subsidence by conducting optical borehole imaging 6 times over a period of 43 days at the study site 2. The displacement magnitude at the deep segment caused by subsidence appeared to be 3 times larger than those at the shallow segment. Similarly, the displacement duration at the deep segment was 4 times longer than those at the shallow segment. Therefore, the combination of electrical resistivity and optical borehole imaging methods can be effectively applicable to detect and monitor ground subsidence caused by underground cavities.
Keywords
electrical resistivity survey; optical borehole imaging; cavity; monitoring; ground subsidence;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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