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2020 Vol.36, Issue 9 Preview Page

Research Article

Development of Triaxial Cells Operable with In Situ X-ray CT for Hydro-Mechanical Laboratory Testing of Rocks

원위치 X-ray CT 촬영이 가능한 암석의 수리-역학 실험용 삼축셀 개발

Li Zhuang1
,
Sun Yeom2
,
Hyu-Soung Shin3*
장 리1
,
염 선2
,
신 휴성3*
1Member, Senior Researcher, Extreme Engrg. Research Center, Korea Institute of Civil Engrg. and Building Technology (KICT)
2Technician, Extreme Engrg. Research Center, KICT
3Member, Senior Research Fellow, Dept. of Future Tech. & Convergence Research, KICT
1정회원, 한국건설기술연구원 극한환경연구센터 수석연구원
2비회원, 한국건설기술연구원 극한환경연구센터 연구원
3정회원, 한국건설기술연구원 미래융합연구본부 선임연구위원
* Corresponding Author
30 September 2020. pp. 45-55
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Abstract

X-ray CT는 암석시편의 공극 및 균열과 같은 내부 미세구조와 손상들의 정량적 분석에 활용되어 왔다. 원위치 CT는 외력 등 다양한 외적 요인에 영향을 받고 있는 암석 시편의 내외부 변화 과정을 관찰할 수 있게 해준다. 이의 확인을 위해, 암반/지반재료 특성분석에 활용한 원위치 X-ray CT 기술에 관한 최신 연구동향을 파악하였으며, 원위치 CT이미징이 가능한 암석의 수리-역학적 실험용 삼축셀을 개발하였다. 직경25~50 mm 화강암 및 사암 코아시편의 원위치 CT이미징이 성공적으로 진행되었으며, 34~105 μm 범위의 픽셀피치의 해상도를 취득할 수 있었다. 본 사전검토 촬영 실험을 통해 마이크로미터 스케일에서 암석의 내부구조 변화의 원위치 CT관찰이 가능한 것을 파악하였다. 요오드화 칼륨 용액은 CT이미지의 대비를 증가시키고 암석의 수리-역학 실험에서 주입유체로 사용할 수 있다.

X-ray computed tomography (CT) is very useful for the quantitative evaluation of internal structures, particularly defects in rock samples, such as pores and fractures. In situ CT allows 3D imaging of a sample subjected to various external treatments such as loading and therefore enables observation of changes that occur during the loading process. We reviewed state-of-the-art of in situ CT applications for geomaterials. Two triaxial cells made using relatively low density but high strength materials were developed aimed at in situ CT scanning during hydro-mechanical laboratory testing of rocks. Preliminary results for in situ CT imaging of granite and sandstone samples with diameters ranging from 25 mm to 50 mm show a resolution range of 34~105 μm per pixel pitch, indicating the feasibility of in situ CT observations for internal structural changes in rocks at the micrometer scale. Potassium iodide solution was found to improve the image contrast, and can be used as an injection fluid for hydro-mechanical testing combined with in situ CT scanning.

Keywords
Fracture permeability
Hydraulic fracturing
In situ X-ray CT
KI solution
Triaxial cell

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 36
  • No :9
  • Pages :45-55
  • Received Date : 2020-08-18
  • Revised Date : 2020-09-01
  • Accepted Date : 2020-09-01
  • DOI :https://doi.org/10.7843/kgs.2020.36.9.45
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