Physical Properties of and Joint Distribution Within the Cheongju Granitic Mass, as Assessed from Drill-core and Geophysical Well-logging Data

Lee, Sunjung; Lee, Cheol-Hee; Jang, Hyung-Su; Kim, Ji-Soo

doi:10.9720/kseg.2011.21.1.015

Cited by 1 publication

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“…, 최근에는 화강암류로 구성된 지반의 강도특성, 물성 및 절리 분포 특성, 균열 발생 특성, 파괴 거동, 최신 기술 을 적용한 공학적 분포 규명 등에 대한 연구가 활발히 진행되어 오고 있다 (Seol et al, 2001;Lee et al, 2011a;Lee et al, 2011b;Lee et al, 2011c;Choi and Chae, 2012;Yun et al, 2012 (Adams et al, 1975;Dearman et al, 1978;Savage, 1986;Kretzschmar et al, 1997;Olowolafe & Dung, 2000;Chigara, 2001;Lan et al, 2003;Kim et al, 2005;Négrel, 2006;Shalkowski et al, 2009 (Kim et al, 2004;Kil et al, 2008). …”

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

Kim¹,

Kim²,

Ok³

et al. 2012

The Journal of Engineering Geology

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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.

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