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Research Article

A Comparative Analysis of the Evaluation Methods for Ground Subsidence in Korea

국내 함몰형 지반침하 평가방법의 비교 분석

Hyun-Bae Park1
,
Seong-Woo Moon2
,
Sejeong Ju3
,
Jeungeum Lee3
,
Yong-Seok Seo4*
박 현배1
,
문 성우2
,
주 세정3
,
이 정음3
,
서 용석4*
1Ph.D. Student, Department of Earth and Environmental Sciences, Chungbuk National University
2Post-Doctor, Department of Earth and Environmental Sciences, Chungbuk National University
3Master Student, Department of Earth and Environmental Sciences, Chungbuk National University
4Professor, Department of Earth and Environmental Sciences, Chungbuk National University
1충북대학교 지구환경과학과 박사과정
2충북대학교 지구환경과학과 박사후연구원
3충북대학교 지구환경과학과 석사과정
4충북대학교 지구환경과학과 교수
*Corresponding Author
30 September 2024. pp. 381-401
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Abstract

To predict the ground subsidence caused by mines, various evaluation methods were applied to cases of ground subsidence in Korea, and the results were compared and analyzed. Continuous subsidence, which is relatively easily and accurately predicted, was excluded in this analysis. The stress arch - volumetric expansion method, limit equilibrium method, numerical analysis, probabilistic method, and evaluation method of the Korea Mine Rehabilitation and Mineral Resources Corporation (KOMIR) were applied to 36 subsidence cases, including subsidence location, width, and depth, and goaf width, depth, and incline data. The stress arch - volumetric expansion method was the most accurate with an accuracy of ~92%. In the case of the KOMIR method, the regression model is 86.1% accurate, but somewhat lower in accuracy using a triangular pyramidal volume. The stress arch - volumetric expansion and KOMIR methods have the disadvantage of evaluating whether subsidence occurs or not. In the case of the numerical analysis, the accuracy is 72.3% when estimating the subsidence depth, but is slightly lower (55.8%) when estimating the subsidence width. The probabilistic and limit equilibrium methods have similar accuracies of 50.8~63.7%. Given it is possible to determine whether subsidence occurs, and the subsidence location, width, and depth with each method, it is recommended to apply various methods when evaluating sinkhole-type subsidence.

Keywords
stress arch - volumetric expansion
limit equilibrium method
numerical analysis
probabilistic method
KOMIR evaluation method

광산에 의한 지반침하 발생여부 및 규모를 예측하기 위해 국내의 지반침하 사례를 대상으로 침하평가 방법들을 적용하고 그 결과를 비교 ‧ 분석하였다. 비교적 예측이 쉽고, 정확성이 검증된 연속형(트러프형) 침하는 분석 대상에서 제외하였으며, 불연속형(함몰형) 침하 사례 36건을 대상으로 침하지 위치, 폭, 깊이, 지층분포, 채굴적의 폭, 깊이, 경사, 심도 등의 정보를 획득하여 응력아치-체적팽창법, 한계평형법, 수치해석법, 확률론적 해석법, 한국광해광업공단 개발 해석법을 적용하였다. 평가 결과, 정확도가 약 92%로 응력아치-체적팽창법이 가장 정확도가 높게 나타났으며, 한국광해광업공단 개발 해석법의 경우 회귀모형이 86.1%로 높은 편에 속하나 응력아치-체적팽창법과 한국광해광업공단 개발 해석법은 함몰형 침하의 발생 유무만 평가한다는 단점이 있다. 수치해석법의 경우 침하지의 깊이를 추정할 때 72.3%의 높은 정확도를 보이나 침하지 폭 추정 시에는 55.8%로 다소 낮게 나타난다. 확률론적 분석법과 한계평형법은 50.8~63.7% 범위 내로 대동소이한 결과를 보인다. 각 분석방법에 따라 지반침하 발생 유무, 위치, 폭, 깊이 등을 파악할 수 있으므로 함몰형 침하 평가 시에는 다양한 분석기법을 복수로 적용하여 검토하는 것이 바람직할 것으로 판단된다.

키워드
응력아치-체적팽창 이론
한계평형법
수치해석법
확률론적해석법
한국광해광업공단의 평가방법
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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 : 34
  • No :3
  • Pages :381-401
  • Received Date : 2024-09-02
  • Revised Date : 2024-09-12
  • Accepted Date : 2024-09-13
  • DOI :https://doi.org/10.9720/kseg.2024.3.381
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