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http://dx.doi.org/10.9720/kseg.2012.3.331

Case Study of a Stability Analysis of a Granitoid Slope in the Gansung-Hyunnae area, GangwonDo  

Kim, Hong-Gyun (Geotechnical Engineering Research Division, Korea Institute of Construction Technology)
Kim, Seung-Hyun (Geotechnical Engineering Research Division, Korea Institute of Construction Technology)
Ok, Young-Seok (Geotechnical Engineering Research Division, Korea Institute of Construction Technology)
Koo, Ho-Bon (Geotechnical Engineering Research Division, Korea Institute of Construction Technology)
Publication Information
The Journal of Engineering Geology / v.22, no.3, 2012 , pp. 331-341 More about this Journal
Abstract
Granitoid rocks are generally high-quality rock from a geotechnical perspective, because they rarely contain systematic joints or fragmented fault zones. Although the rock type at the Sanhak site is granite, a collapsed slope has a deep soil layer and shows no residual structures such as discontinuities or faults; surface avalanches from this slope can be observed in several places. To study the stability of this slope, we investigated rainfall duration, variation in pore-water pressure, and the factor of safety considering three cases (current cross-section, initial planning cross-section, revised planning cross-section). With increasing duration of rainfall, the groundwater level rises, up to 20 m in height from ground surface. In the initial planning cross-section, safety was secure for rainfall of 2 days duration, but inadequate for rainfall of 4 days duration. In the revised planning cross-section, however, safety factors were secure for rainfall of 4 days duration. Therefore, to ensure permanent stability at the Sanhak site, a slope degree of 1:1.8 should be maintained during cutting.
Keywords
Granitoid rock; Surface avalanches; Duration of rainfall; pore-water pressure; safety factors;
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Times Cited By KSCI : 13  (Citation Analysis)
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