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2017 Vol.27, Issue 5 Preview Page

Research Article

A Study on Correlation between Heterogeneity Index and Mechanical Properties of Igneous Rocks using 3D X-ray Computed Tomography Image

3차원 X-ray CT 영상을 이용한 화성암 불균질 지수와 역학적 특성과의 상관관계에 대한 연구

Yeon Jong Jeong1
,
Kwang Yeom Kim2
,
Tae Sup Yun1*
정 연종1
,
김 광염2
,
윤 태섭1*
1Department of Civil and Environmental Engineering, Yonsei University
2Korea Institute Of Civil Engineering And Building Technology
1연세대학교 공과대학 토목환경공학과
2한국건설기술연구원 지반연구소
* 교신저자* Corresponding Author
1 October 2017. pp. 333-342
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Abstract

In this study, the heterogeneity of internal structure of various igneous rocks acquired in Korea was quantified and correlated with the seismic velocity and the point load strength. Three-dimensional X-ray Computed Tomography (CT) was used to obtain information on the internal structure of the rock specimen, and the representative unit length (LR) was calculated by applying a statistical technique to the CT images. We also proposed an estimation equation to predict the mechanical properties of rocks from the relationship between LR, acoustic velocity and point load strength. In the proposed method, it is shown that the characterization of internal structure of rocks could be utilized as an indirect index to account for the mechanical behavior of rocks by substituting physical laboratory testing for non-destructive test.

Keywords
3D X-ray CT
Igneous rock
Point load strength
Elastic wave velocity
Internal structure of rocks

본 연구에서는 국내의 다양한 화성암에 대해 내부구조의 불균질성을 정량화하고, 이와 탄성파속도 및 점하중강도간의 상관관계를 분석하였다. 3차원 X-ray Computed Tomography(CT)를 통해 암석 시편 내부 구조에 대한 정보를 획득하였으며, 3차원 영상에 통계적 기법을 적용하여 뷸균질성 대표계수(representative unit length, LR)를 계산하였다. 또한 암석의 탄성파 속도 및 점하중강도와 LR간의 상관관계로부터 암석의 역학적 특성치를 예측하는 추정식을 제안하였다. 본 연구에서 제안한 방법을 통해 3차원 X-ray 영상에 기반한 내부 특성 분석값을 이용해 실내실험을 수행하지 않고도 암석의 역학적 물성을 평가할 수 있는 간접적인 인자를 도출할 수 있는 가능성을 확인하였다.

키워드
3차원 X-ray CT
화성암
점하중강도
탄성파속도
암석내부구조
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Information
  • Publisher :Korean Society for Rock Mechanics and Rock Engineering
  • Publisher(Ko) :한국암반공학회
  • Journal Title :Tunnel and Underground Space
  • Journal Title(Ko) :터널과 지하공간
  • Volume : 27
  • No :5
  • Pages :333-342
  • Received Date : 2017-10-22
  • Revised Date : 2017-10-25
  • Accepted Date : 2017-10-26
  • DOI :https://doi.org/10.7474/TUS.2017.27.5.333
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