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2023 Vol.33, Issue 4 Preview Page

Research Article

Time-Series Interferometric Synthetic Aperture Radar Based on Permanent Scatterers Used to Analyze Ground Stability Near a Deep Underground Expressway Under Construction in Busan, South Korea

고정산란체 기반 시계열 영상레이더 간섭기법을 활용한 부산 대심도 지하 고속화도로 건설 구간의 지반 안정성 분석

Taewook Kim1
,
Hyangsun Han2
,
Siung Lee3
,
Woo-Seok Kim4*
김 태욱1
,
한 향선2
,
이 시웅3
,
김 우석4*
1Doctor Program, Department of Geophysics, Kangwon National University
2Assistant Professor, Department of Geophysics, Kangwon National University
3Master’s Degree Program, Department of Geophysics, Kangwon National University
4Senior Researcher, Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology
1강원대학교 지구물리학과 박사과정
2강원대학교 지구물리학과 조교수
3강원대학교 지구물리학과 석사과정
4한국건설기술연구원 지반연구본부 수석연구원
*Corresponding Author
31 December 2023. pp. 689-699
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Abstract

Assessing ground stability is critical to the construction of underground transportation infrastructure. Surface displacement is a key indicator of ground stability, and can be measured using interferometric synthetic aperture radar (InSAR). This study measured time-series surface displacement using permanent scatterer InSAR applied to Sentinel-1 SAR images acquired from January 2017 to June 2023 for the area around a deep underground expressway under construction to connect Mandeok-dong and Centum City in Busan, South Korea. Regions of seasonal subsidence and uplift were identified, as were regions with severe subsidence after summer 2022. To evaluate stability of the ground in the construction area, the mean displacement velocity, final surface displacement, cumulative surface displacement, and difference between minimum and maximum surface displacement were analyzed. Considering the time-series surface displacement characteristics of the study area, the difference between minimum and maximum surface displacement since June 2022 was found to be the most suitable parameter for evaluating ground stability. The results identified highly unstable ground in the construction area as being to the north of the mid-lower reaches of the Oncheon-cheon River and to the west of the Suyeong River at the point where both rivers meet, with the difference between minimum and maximum surface displacement of 40~60 mm.

Keywords
surface displacement
underground expressway
ground stability
PSInSAR
Sentinel-1

지하 교통 인프라 건설에 있어서 지반 안정성을 평가하는 것은 매우 중요하다. 지표변위는 지반 안정성을 평가하는데 사용되는 주요 인자 중 하나로 인공위성 영상레이더(Synthetic Aperture Radar, SAR)에 레이더 간섭기법(Interferometric SAR, InSAR)을 통해 관측될 수 있다. 이 연구에서는 부산광역시의 만덕동과 센텀시티를 잇는 대심도 지하 고속화도로 건설 구간에 대해 2017년 1월부터 2023년 6월까지 획득된 Sentinel-1 SAR 영상에 고정산란체 기반 시계열 영상레이더 간섭기법(Permanent Scatterer InSAR, PSInSAR)을 적용하여 시계열 지표변위를 산출하였다. 계절에 따라 지반의 침하와 융기가 반복되는 지역과 2022년 여름철 이후 심각한 지반침하가 발생하는 지역이 확인되었다. 지하 고속화도로 건설 구간에 대한 지반 안정성을 평가하기 위해 평균변위속도, 최종 지표 변위량, 누적 지표 변위량, 최소-최대 변위량의 차이를 분석하였다. 연구지역의 시계열 지표변위 특성을 고려하여 2022년 6월 이후의 최소-최대 변위량의 차이가 지반 안정성 평가에 가장 적합한 것을 확인하였으며, 지하 고속화도로 건설 구간 중 온천천 중하류의 북쪽 지반과 수영강이 온천천과 합류하는 지점에서 수영강 서편 지반이 40~60 mm의 최소-최대 변위량을 보여 불안정성이 큰 것을 파악하였다.

키워드
지표변위
지하 고속화도로
지반 안정성
고정산란체 기반 간섭기법
Sentinel-1
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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 : 33
  • No :4
  • Pages :689-699
  • Received Date : 2023-12-06
  • Revised Date : 2023-12-24
  • Accepted Date : 2023-12-26
  • DOI :https://doi.org/10.9720/kseg.2023.4.689
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