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http://dx.doi.org/10.9720/kseg.2011.21.4.313

Case study on the cause of failure and characteristics of soil at a collapsed cut-slope at the ${\bigcirc}{\bigcirc}$ Detour, Jeonranam-Do  

Kim, Seung-Hyun (Geotechnical Engineering Research Division, Korea Institute of Construction Technology)
Koo, Ho-Bon (Geotechnical Engineering Research Division, Korea Institute of Construction Technology)
Hwang, Jin-Hyun (Department of Geological Sciences, Pusan National University)
Son, Moon (Department of Geological Sciences, Pusan National University)
Publication Information
The Journal of Engineering Geology / v.21, no.4, 2011 , pp. 313-322 More about this Journal
Abstract
On September 2007, numerous slopes at Jeonranam-Do collapsed as a result of rainfall related to Typhoon Nari. Failure occurred at a road cut-slope on the ${\bigcirc}{\bigcirc}$ detour road, damaging transport infrastructure. This study aims to determine the cause of failure based on field investigations, the geotechnical properties of soil, clay mineral composition, and quantitative analysis. The studied cut slope consists of weathered soil that originated from volcanic rocks, and minor faults and a mafic dyke. Surface water tends to seep into the soil because the roadway is not sealed and because of poorly installed drainage. Sieve and XRD analyses indicate that soils in the failure zone are ML and CH, which are prone to swelling due to the presence of clay minerals such as smectite and vermiculite. The slope failed due to the improper construction of drainage facilities, the presence of geological weak zones, and high soil contents of swelling clay.
Keywords
collapsed cut-slope; field investigation; sieve analysis; XRD;
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Times Cited By KSCI : 3  (Citation Analysis)
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