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2021 Vol.31, Issue 4 Preview Page

Research Article

Risk Assessment of Cut Slope by Gravity Field Interpretation and Modelling

비탈면 위험도 평가를 위한 중력장 해석 및 모델링

Sungchan Choi1
,
Sung-Wook Kim2*
,
Eun-Kyoung Choi3
,
Yeong-Jae Lee4
,
Hyun-Ick Jang5
최 승찬1
,
김 성욱2*
,
최 은경3
,
이 영재4
,
장 현익5
1Senior Researcher, Geo-Information Research Group Co., Ltd.
2CEO, Geo-Information Research Group Co., Ltd.
3Director, Geo-Information Research Group Co., Ltd.
4Researcher, Geo-Information Research Group Co., Ltd.
5Research Fellow, Korea Expressway Corporation Research Institute
1(주)지아이 지반정보연구소 책임연구원
2(주)지아이 지반정보연구소 대표이사
3(주)지아이 지반정보연구소 실장
4(주)지아이 지반정보연구소 연구원
5한국도로공사 도로교통연구원 연구위원
*Corresponding Author
31 December 2021. pp. 533-540
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Abstract

Gravity field analysis and density modeling were performed to evaluate the internal state of the rock mass, which is the cause of cut slope collapse. The shape of the weathered zone and the depth of basement could be confirmed from the complete Bouguer anomaly and density model. The basement depth at the center of the cut slope calculated using the Euler deconvolution inverse method is 30 m, which is about 10 m deeper than the surrounding area. In addition, the depth of basement and the thickness of the weathered zone are similar to the boundary between low resistivity and high resistivity in dipole-dipole survey. From the study results, gravity field analysis and density modeling recognizes the internal state of the rock slope and can be used for slope safety analysis, and is particularly suitable as a method to determine the shape of weathered zones in interpreting the safety of cut slopes

Keywords
cut slope
safety
gravity
Euler deconvolution
weathering zone

비탈면 안전성과 밀접한 관련이 있는 내부 상태를 평가하는 방법으로 복합지구물리탐사와 지반의 밀도 모델링을 수행하였다. 완전부게이상 분포로부터 풍화대의 규모와 신선한 기반암의 분포 위치를 확인할 수 있었다. 오일러 디콘볼루션 역산법으로 비탈면 중앙부의 신선한 기반암은 주변에 비해 10 m 정도 깊은 30 m 깊이에 분포하고 저밀도의 풍화대 두께가 증가한다. 이러한 경향은 전기비저항 분포에서 관찰되는 저비저항과 고비저항대의 깊이와 일치한다. 비탈면 지반의 밀도 모델은 암반의 차별풍화대의 분도와 유사하게 나타났으며 이러한 결과로부터 중력장 해석을 이용한 밀도 모델링이 비탈면의 내적인 상태변화와 안전성 해석에 활용될 수 있고 노출된 암반에서 풍화대의 형상을 파악하는 방법으로써 적합함을 시사한다.

키워드
비탈면
안전성
중력
오일러 디콘볼루션
풍화대
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 31
  • No :4
  • Pages :533-540
  • Received Date : 2021-10-15
  • Revised Date : 2021-11-04
  • Accepted Date : 2021-11-16
  • DOI :https://doi.org/10.9720/kseg.2021.4.533
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