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2022 Vol.32, Issue 1

Technical Note

Improvement of In-Situ Stress Measurements by Hydraulic Fracturing – Focusing on the New Standard by Japanese Geotechnical Society

수압파쇄를 이용한 초기응력 측정 결과의 신뢰도 제고 방안 – 일본 지반공학회 표준시험법 개정안을 중심으로

Hyung-Mok Kim1
,
Hangbok Lee2
,
Chan Park2*
,
Eui-Seob Park3
김 형목1
,
이 항복2
,
박 찬2*
,
박 의섭3
1Professor, Department of Energy Resources and Geosystems Engineering, Sejong University
2Principal Researcher, Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM)
3Leader, Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM)
1세종대학교 지구자원시스템공학과 교수
2한국지질자원연구원 국토지질연구본부 심층처분환경연구센터 책임연구원
3한국지질자원연구원 국토지질연구본부 심층처분환경연구센터장
*Corresponding Author
28 February 2022. pp. 1-19
PDF XML Citation
Abstract

In this report, new standard, published by Japanese Geotechnical Society, on in-situ stress measurements by hydraulic fracturing was reviewed. In the standard, modification was made for the calculation of fracture re-opening pressure in consideration of fracture surface roughness and residual aperture. The standard also presents how much the system compliance influences the estimation of the fracture re-opening pressure and subsequent in-situ stresses. It is shown that the stiffer the rock mass is, the system compliance should be sufficiently small enough so as to obtain in-situ stress measurement with higher confidence.

Keywords
In-situ stress
Hydraulic fracturing
Fracture reopening pressure
Compliance

본고에서는 수압파쇄를 이용한 초기응력 측정결과의 정밀도 제고 방안으로 최근 제안된 일본 지반공학회 표준시험법 개정안의 검토 결과를 수록하였다. 개정안에서는 수압파쇄에 의해 형성된 암석 균열 표면의 거칠기와 잔류 간극을 고려한 균열재개압력의 수정식을 제안하였다. 또한, 수압파쇄시스템 컴플라이언스가 초기응력 추정 결과에 미치는 영향을 파악하고 주변 암반의 탄성계수가 클수록 수압파쇄시스템 컴플라이언스가 충분히 낮아야함을 보였다.

키워드
초기응력
수압파쇄
균열재개압력
컴플라이언스
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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 : 32
  • No :1
  • Pages :1-19
  • Received Date : 2021-09-12
  • Revised Date : 2021-11-08
  • Accepted Date : 2022-02-18
  • DOI :https://doi.org/10.7474/TUS.2022.32.1.001
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