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2020 Vol.30, Issue 4 Preview Page

Research Article

A Study on the Cause Analysis of the Ground Subsidence in Limestone Mine

석회석 광산에서 발생한 지반침하에 대한 원인 분석 연구

Sangeun Lee1
,
Gyo-Cheol Jeong2*
이 상은1
,
정 교철2*
1Professor, Department of Energy and Resources Engineering, Kangwon National University
2Professor, Department of Earth and Environmental Sciences, Andong National University
1강원대학교 에너지공학부 교수
2안동대학교 지구환경과학과 교수
*Corresponding Author
31 December 2020. pp. 497-514
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Abstract

This study investigated the causes of large-scale ground subsidence in the upper part of mining cavities of the Samdo limestone mine, Samcheok city, Gangwondo, Korea. Geological and electrical resistivity surveys were undertaken on the collapsed slope of the mountain and in the mine tunnel where subsidence occurred, with geotechnical evaluations and numerical analysis. It is concluded that wide mining cavities, with irregular pillars in unstable rock masses hosting discontinuities, weathered over time, resulting in subsidence occurring along a fault plane due to increasing ground stress.

Keywords
limestone mine
ground subsidence
geological investigation
numerical analysis
fault plane

본 연구는 강원도 삼척시 소재의 삼도 석회석광산에서 발생한 채굴공동 상부의 대규모 지반침하지를 대상으로 그 발생원인을 규명하는데 있다. 현장에서 채광, 측량도면 및 지질도 등을 토대로 지반침하지 인근의 갱도 및 산사면 붕괴지에 대한 지질조사 및 전기비저항탐사를 수행하였으며, 그 결과들로부터 지질공학적 평가를 수행하고 다양한 경험식과 수치해석 방법에 의해 지반침하의 원인을 분석하였다. 해석결과로부터 다양한 불연속면이 발달한 불안정한 지반 내에서 채굴공동의 폭이 넓고 불규칙한 Pillar 설치로 인하여 오랜 기간 동안 채굴적 천단부 및 Pillar가 점진적으로 이완되면서 지반응력의 증가로 단층면을 따라 붕락되어 지반침하가 발생된 것으로 판단된다.

키워드
석회석 광산
지반침하
지질조사
수치해석
단층면
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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 : 30
  • No :4
  • Pages :497-514
  • Received Date : 2020-10-30
  • Revised Date : 2020-12-01
  • Accepted Date : 2020-12-02
  • DOI :https://doi.org/10.9720/kseg.2020.4.497
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