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A Study on the Slope Stability Assessment of Seokguram Region in Gyeongju

경주 석굴암 주변 비탈면의 안정성에 관한 연구

Kwang-Wu Lee1*
,
Seung-Hyun Kim1
,
Sam-Deok Cho2
이 광우1*
,
김 승현1
,
조 삼덕2
1Member, Senior Researcher, Geotechnical Engineering Research Institute, Korea Institute of Civil engineering and building Technology
2Member, Senior Research Fellow, Geotechnical Engineering Research Institute, Korea Institute of Civil engineering and building Technology
*교신저자. *Corresponding Author. 
30 December 2017. pp. 139-149
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Abstract

The maintenance, repair, and reinforcement projects and structural stability assessments of Seokguram have primarily focused on examining the condition of stone members of Seokguram and the concrete dome structure for Seokguram. However, a 12 m-high rock slope located behind Seokguram raises a concern of slope failure and rockfall, which may reduce stability of Seokguram. It is also unclear whether the soil slopes and masonry wall at the side and the front of Seokguram have sufficient long-term stability against localized heavy rains and earthquakes, which have been frequent in recent years. The present study investigates the ground and the slopes around Seokguram using detailed field survey to identify geographical and geological risk factors, and assess structural stability of the exposed rock mass behind and the slope in front of Seokguram and the masonry wall using stability analysis.

Keywords
Seokguram
Rock slope
Slope stability assessment
Field survey

석굴암이 발견된 이후 수행된 그간의 정비 및 보수･보강 사업과 구조안정성 평가는 주로 석굴암의 석재와 콘크리트 돔 구조체 의 상태 점검을 위주로 진행되어 왔다. 그러나, 석굴암 배면에는 높이 12m의 암반비탈면이 위치하여 비탈면 붕괴나 낙석 등의 발생이 우려되고, 이는 석굴암의 안정을 저해하는 요인이 될 수 있다. 또한 석굴암 측면 및 전면부의 토사비탈면과 석축의 경우도 최근 빈번해지고 있는 국지성 호우와 지진의 영향으로 장기적으로 안정성을 확보하고 있는지 의문시된다. 이에 본 연구에서는 석굴암 주변 지반과 비탈면에 대한 상세 현장조사를 통해 지형 및 지질학적 위험요인들을 파악하고, 안정성 해석을 통해 석굴암 배면의 노출암반 및 전면부 비탈면과 석축 등의 구조적 안전성을 검토하였다.

References
1
Archtectural Institute of Korea (1997), Report on structural safety diagnosis of the Seokguram. (in Korean).
2
Bieniawski, Z. T. (1989), Engineering rock mass classification, John Wiley & Sons.
3
Kim, U. K, Zhuang, L., and Lee, K. W. (2014), Development of Advanced Dynamic Cone Penetration Test Apparatus and Its Application Performance Evaluation, The Journal of Korean Geosynthetics Society, Vol.13, No.4, pp.119-131. (in Korean with English abstract).
4
Romana, R. M. (1993), A Geomechanical classification for Slopes: Slope Mass Rating, Comprehensive rock engineering, ed. Hudson, Pergamon, press, chpt. 23, pp. 575-600.
Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 16
  • No :4
  • Pages :139-149
  • Received Date : 2017-11-29
  • Revised Date : 2017-12-13
  • Accepted Date : 2017-12-15
  • DOI :https://doi.org/10.12814/jkgss.2017.16.4.139
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