지질공학 (The Journal of Engineering Geology)

  • 제22권3호
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  • Pages.331-341
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  • 2012
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  • 1226-5268(pISSN)
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  • 2287-7169(eISSN)
대한지질공학회 (The Korean Society of Engineering Geology)
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강원도 간성-현내 지역 화강암류 비탈면 안정성 검토 사례 연구

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

  • 김홍균 (한국건설기술연구원 Geo-인프라연구실) ;
  • 김승현 (한국건설기술연구원 Geo-인프라연구실) ;
  • 옥영석 (한국건설기술연구원 Geo-인프라연구실) ;
  • 구호본 (한국건설기술연구원 Geo-인프라연구실)
  • 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)
  • 투고 : 2012.09.10
  • 심사 : 2012.09.25
  • 발행 : 2012.09.28
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초록

화강암류 암석은 일반적으로 절리 발달이 미약하고 단층파쇄대가 잘 발달하지 않는 등 공학적으로 양질의 암석에 해당된다. 그러나 산학지구 붕괴 비탈면을 구성하는 지반은 화강암류로 구성되었음에도 불구하고, 깊은 토사층을 가지며, 불연속면이나 단층 등의 지질구조는 거의 관찰되지 않고, 표층붕괴가 발생한 형태에 해당된다. 본 비탈면의 안정성 고찰을 위해 3가지 경우(현재 단면, 최초 설계 단면, 수정 설계 단면)에 대한 강우지속시간과 간극수압 변화, 안전율 등에 관한 해석을 수행하였다. 강우 지속시간이 길어질수록 지하수위는 높이 20 m까지 상승하는 것으로 나타났으며, 최초 설계단계 단면의 2일 지속강우 기간에는 안전율이 확보되는 것으로 확인되지만, 4일 강우지속기간 동안에는 허용안전율을 만족하지 못하는 것으로 확인되었다. 수정 설계 단면에서는 4일 강우지속기간에도 안전율이 확보되므로 산학 지구는 1:1.8 경사도로 절취하는 것이 영구적인 안정성을 확보하는 방안이라고 판단된다.

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.

키워드

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