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2018 Vol.28, Issue 3 Preview Page

Research Article

Strategy for Improving the Resolution of Electrical-resistivity Inversions for Detecting Soft Ground at Shallow Depths (~ 10 m)

천부(약 10 m) 연약 지반 탐지를 위한 전기비저항 역산 해상도 향상 전략

Hangilro Jang1
,
Seo Young Song2
,
Bitnarae Kim2
,
Myung Jin Nam3*
장 한길로1
,
송 서영2
,
김 빛나래2
,
남 명진3*
1Department of Energy and Mineral Resources Engineering, Sejong University, Postdoctoral Researcher; Currently, Archaeology Research Division, National Research Institute of Cultural Heritage, Researcher
2Department of Energy and Mineral Resources Engineering, Sejong University, Ph.D. Student
3Department of Energy and Mineral Resources Engineering, Sejong University, Associate Professor
1세종대학교 에너지자원공학과, 박사후 연구원; 현재, 국립문화재연구소 고고연구실, 연구원
2세종대학교 에너지자원공학과, 박사과정
3세종대학교 에너지자원공학과, 부교수
* Corresponding Author
30 September 2018. pp. 367-377
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Abstract

This study introduces a DC resistivity inversion method that incorporates structural and inequality constraints to enhance the resolution of resistivity inversions, and presents sample inversion results with these constraints. In the constrained inversions, a base model is constructed from a layered model through interpretation of other geophysical data. Inversion tests establish that both the structural and inequality constraints produce better resistivity models than the unconstrained inversion. However, the inequality inversion not only reproduces the exact layered structure of the background, it reproduces conductive anomalies at a depth of ~ 10 m when an inexact base model of electrical resistivity is used.

Keywords
land subsidence
resistivity inversion
base model
structural constraint
inequality constraint

이 연구는 전기비저항 역산의 해상도를 높이기 위한 구조제약과 부등식 제약조건을 적용한 전기비저항 역산법을 소개하고 적용한 결과를 보여준다. 이들 역산에서는 지하투과레이다와 표면파 탐사자료로부터 사전 해석된 층서구조를 전기비저항 참조모델로 도입하고 구조제약과 부등식 제약의 유용성을 합성모델을 이용한 역산실험으로 확인하였다. 연약지반 조건을 가정한 실험모델에 대한 구조제약과 부등식제약 역산실험 모두 일반적인 전기비저항 역산보다 향상된 역산결과를 보여주었으나, 부등식제약 역산에서는 참조모델이 다소 부정확한 경우에도 배경층서구조를 정확히 재구성하는 동시에 천부(약 10 m 심도)의 전도성 이상체들도 정확히 나타내는 역산결과를 보여주었다.

키워드
지반침하
전기비저항 역산
참조모델
구조제약
부등식제약
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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 : 28
  • No :3
  • Pages :367-377
  • Received Date : 2018-01-16
  • Revised Date : 2018-07-10
  • Accepted Date : 2018-07-15
  • DOI :https://doi.org/10.9720/kseg.2018.3.367
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