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http://dx.doi.org/10.9720/kseg.2020.1.031

Delineation of Geological Weak Zones in an Area of Small-scale Landslides Using Correlation between Electrical Resistivity, Bore, and Well-logging Data  

Lee, Sun-Joong (Department of Earth & Environmental Sciences, Chungbuk National University)
Kang, Yu-Gyeong (Department of Earth & Environmental Sciences, Chungbuk National University)
Lee, Cheol-Hee (ASIAGEO Co., Ltd.)
Jeon, Su-In (ASIAGEO Co., Ltd.)
Kim, Ji-Soo (Department of Earth & Environmental Sciences, Chungbuk National University)
Publication Information
The Journal of Engineering Geology / v.30, no.1, 2020 , pp. 31-42 More about this Journal
Abstract
Electrical resistivity and downhole seismic surveys were conducted together with bore investigations and well-logging to examine subsurface structures in small-scale landslides at Sinjindo-ri, Geunheung-myeon, Taean-gun, Chungcheongnam-do, Republic of Korea in 2014. On the basis of the low N-values at depths of 5~7 m in borehole BH-2, downhole seismic and electrical dipole-dipole resistivity surveys were performed to delineate geological weak zones. The low-resistivity zones (<150 Ω·m) measure ~8 m in thickness and show a close depth correspondence to weathered soils consisting mainly of silty clays as identified from the bore investigations and well-logging data. Compared with weak zones in borehole BH-1, weak zones in BH-2 are characterized by lower densities (1.6~1.8 g/㎤) and resistivities (<150 Ω·m) and greater variation in Poisson's ratio. These observations can be explained by the presence of wet silty clays rich in weathered soil material that have resulted from heavy rainfall and rises in groundwater level. Downslope movements are probably caused by the sliding of wet clay that acts to reduce the strength of the weathered soil.
Keywords
landslides; electrical resistivity; downhole seismic survey; well-logging; geological weak zone;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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