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http://dx.doi.org/10.9720/kseg.2020.3.289

Delineation of the Slip Weak Zone of Land Creeping with Integrated Geophysical Methods and Slope Stability Analysis  

Lee, Sun-Joong (Forest Technology Division, National Forestry Cooperative Federation)
Kim, Ji-Soo (Department of Earth & Environmental Sciences, Chungbuk National University)
Kim, Kwan-Soo (Department of Earth & Environmental Sciences, Chungbuk National University)
Kwon, Il-Ryong (Department of Earth & Environmental Sciences, Chungbuk National University)
Publication Information
The Journal of Engineering Geology / v.30, no.3, 2020 , pp. 289-302 More about this Journal
Abstract
To determine the shallow subsurface structure and sliding surface of land creeping in 2016 at Hadong-gun, Gyeongsangnam-do, geophysical surveys (electric resistivity, and refraction seismic methods, borehole televiewer) and slope stability analysis were conducted. The subsurface structure delineated with borehole lithologies and seismic velocity structures provided the information that the sediment layer on the top of the slope was rather as thick as 20 m and the underlying weathered rock (anorthosite) was thinner than 1 m. Based on the tension cracks observed during the geological mapping, televiewer scanning was performed at the borehole BH-2 and detected the intensive fracture zones at the ground-water level, associated with the slip weak zones mapped in dipole-dipole electrical resistivity section. Downslope sliding and slightly upward pushing at the apex of high resistive bedrock explains the curved slip plane of the land creeping. Such a convex structure might play a role of natural toe abutment for preventing the downward development of slip weak zones. In slope stability analysis, the safety factors of the slip weak zone are calculated with varying the groundwater levels for dry and rainy seasons and the downslope is founded to be unstable with safety factor of 0.89 due to fully saturated material in rainy season.
Keywords
land creeping; integrated geophysical survey; tension crack; slope stability analysis; slip weak zone;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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