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2025 Vol.35, Issue 2 Preview Page

Research Article

Gravity Field Interpretation and Modeling to Understand the Sinkhole in Myeongil-dong, Gangdong-gu, Seoul

중력장 해석과 수치해석을 통한 서울시 강동구 명일동에서 발생한 땅꺼짐의 원인 고찰

Sungchan Choi1
,
Dae-Hong Go2
,
Yeong-Jae Lee2
,
Eun-Kyeong Choi1
,
Sung-Wook Kim3*
최 승찬1
,
고 대홍2
,
이 영재2
,
최 은경1
,
김 성욱3*
1Chief Researcher, Geo-Information Research Group Co., Ltd.
2Researcher, Geo-Information Research Group Co., Ltd.
3CEO, Geo-Information Research Group Co., Ltd.
1(주)지아이 지반정보연구소 책임연구원
2(주)지아이 지반정보연구소 연구원
3(주)지아이 지반정보연구소 대표
*Corresponding Author
30 June 2025. pp. 183-194
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Abstract

The cause of the large sinkhole that occurred on 24 March, 2025 in Myeongil-dong, Gangdong-gu, Seoul, was identified through gravity field interpretation and subsurface density modeling. The sinkhole is thought to have originated in a low-density zone presumed to be the damage zone of a concealed fault covered by alluvial deposits, indicating a natural cause. In addition, anthropogenic factors, including leakage from underground pipes and excavation, are thought to have contributed to the incident. Over the long term, the fault appears to have facilitated the development of a deeply weathered zone conducive to moisture retention, while associated fractures provided favorable hydrogeological conditions for groundwater movement. In the short term, leakage from water and sewage pipes, along with underground excavation, accelerated the formation of the sinkhole. The surface collapse is thought to have occurred as low-density soil migrated into the tunnel under excavation along the fault damage zone.

Keywords
sinkhole
gravity field interpretation
low-density zone
concealed fault

중력장 해석과 밀도 모델링을 이용하여 2025년 3월 24일 서울시 강동구 명일동에서 발생한 대형 싱크홀(sinkhole)의 원인을 파악하였다. 연구결과, 땅꺼짐은 자연적 원인으로 충적층에 피복된 숨은단층의 손상대로 추정되는 저밀도층에서 발생하였으며, 지중 관로의 누수와 굴착 등의 인위적인 원인이 복합적으로 작용한 결과로 해석된다. 지층붕괴는 장기적으로 단층의 영향으로 수분 저장이 용이한 깊은 심도의 풍화대가 발달하였고, 단열은 지하수가 이동하기 쉬운 수리적 조건을 제공하였다. 단기적으로 상 ‧ 하수관로 등의 누수와 지하 굴착은 땅꺼짐을 촉진하는 요인으로 작용하였고 지표면 함몰은 저밀도의 토사층이 단층 손상대를 따라 굴착 중인 터널 내부로 흘러내리는 과정에서 발생한 것으로 판단된다.

키워드
땅꺼짐
중력장 해석
저밀도층
숨은단층
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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 : 35
  • No :2
  • Pages :183-194
  • Received Date : 2025-04-15
  • Revised Date : 2025-05-29
  • Accepted Date : 2025-06-17
  • DOI :https://doi.org/10.9720/kseg.2025.2.183
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