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2025 Vol.35, Issue 1

Research Article

Comparison of Stress Perturbation Models Using Different Representations of Discontinuities

수치모델에서 불연속면 표현 방식에 따른 응력 교란 모사 비교

Minzy Kang12
,
Chandong Chang3*
강 민지12
,
장 찬동3*
1Ph.D. Student, Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources
2Ph.D. Student, Earth, Environmental & Space Sciences, Chungnam National University
3Professor, Department of Geological Sciences, Chungnam National University
1한국지질자원연구원 심층처분환경연구센터 박사과정연구생
2충남대학교 지구환경우주융합과학과 박사과정연구생
3충남대학교 지질환경과학과 교수
*Corresponding Author
31 March 2025. pp. 1-11
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Abstract

In numerical models, discontinuities such as faults and fractures in a rock mass are commonly represented either by thin continuum elements or by frictional planes. We investigate the performance of the two end-member discontinuity models in terms of replicating stress perturbations around discontinuities. We test two model cases: a simple 2D fault model and fractures in a borehole wall. For each case, we model the discontinuity either as thin elastic material or a discontinuous frictional plane. The primary input parameters for the continuum elements are elastic constants and those for the discontinuous planes are frictional properties. We use geologically reasonable values for these parameters and assess their performance by comparing the results with field and borehole observations. The results show that the continuum approach is more effective in modeling the stress perturbation around a discontinuity.

Keywords
numerical model
fault
fracture
stress perturbation

단층, 균열과 같은 암반 불연속면은 수치모델에서 얇은 연속체 요소 또는 불연속 마찰면으로 표현된다. 본 연구에서는 수치모델에서 이 두 가지 불연속면 표현 방식이 불연속면 주변의 응력 교란을 모사하는 데 있어 효율성을 검토하였다. 각 불연속면 표현 방식에 따라 두 가지 모델 사례를 시험하였다. 하나는 단순한 이차원 단층 모델이고 다른 하나는 균열의 존재에 의해 교란되는 시추공벽 응력 모델이다. 각 모델 사례에서 불연속면을 얇은 탄성물질로 표현한 경우와 불연속 마찰면으로 모델링한 경우를 비교하였다. 연속체 요소의 주 입력 변수는 탄성상수로, 불연속 평면의 주요 입력 변수는 마찰 물성으로 부여하였다. 이들 물성에 합리적인 값을 부여한 후 모델링한 결과를 실제 현장이나 시추공에서 관찰한 결과와 비교하여 성능을 검사하였다. 모델 시험 결과는 연속체 모델 접근 방식이 불연속성 주변의 응력 교란을 모사하는 데 더 효과적임을 보여준다.

키워드
수치모델
단층
균열
응력 교란
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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 :1
  • Pages :1-11
  • Received Date : 2025-01-16
  • Revised Date : 2025-02-12
  • Accepted Date : 2025-02-16
  • DOI :https://doi.org/10.9720/kseg.2025.1.001
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