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2021 Vol.31, Issue 4 Preview Page

Research Article

New Joint Roughness Coefficient and Shear Strength Criterion Based on Experimental Verification of Standard Roughness Profile

표준 거칠기 단면의 실험적 검증에 의한 새로운 거칠기 계수 및 전단강도 기준식

Hyun-Sic Jang1
,
Min-Yong Sim2
,
Bo-An Jang3*
장 현식1
,
심 민용2
,
장 보안3*
1Research Professor, Research Institute for Earth Resources, Kangwon National University
2Master Student, Department of Geophysics, Kangwon National University
3Professor, Department of Geophysics, Kangwon National University
1강원대학교 지구자원연구소 연구교수
2강원대학교 지구물리학과 석사과정
3강원대학교 지구물리학과 교수
*Corresponding Author
31 December 2021. pp. 561-577
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Abstract

The ten standard roughness profiles suggested by Barton and Choubey (1977) were extended to make three-dimensional (3D) joint models whose profiles were identical at any cross section. Replicas of joint models were produced using plaster of Paris, and direct shear tests were performed to verify the joint roughness coefficients (JRC) of the standard roughness profiles. Joint shear strengths measured by direct shear tests were compared with those predicted by the shear failure criterion suggested by Barton (1973) based on JRC, joint compressive strength (JCS), and joint basic friction angle (ϕb). Shear strengths measured from joints of the first and fourth standard roughness profiles were close to predicted values; however, shear strengths measured from the other joint models were lower than predicted, the differences increasing as the roughness of joints increased. Back calculated values for JRC, JCS, and from the results of the direct shear tests show measured shear strengths were lower than predicted shear strengths because of the JRC values. New JRC were back calculated from the measured shear strength and named JRCm. Values of JRCm were lower than the JRC for the standard roughness profiles but show a strong linear relationship to JRC. Corrected JRCm values for the standard roughness profiles are provided and revised relationships between JRCm and JRC, and new shear strength criterion are suggested.

Keywords
rock joint
shear strength criterion
joint roughness coefficient (JRC)
joint replica
direct shear test
back analysis

Barton and Choubey(1977)가 제안한 10개의 표준 거칠기 단면을 3차원으로 확장하여 모든 단면의 거칠기가 일정한 3차원 표준 거칠기 절리 모형을 제작하였다. 석고를 사용하여 이 절리 모형을 복제하여 절리시료를 제작하였고, 복제된 절리시료에 직접전단시험을 실시하여 표준거칠기 단면에 부여된 절리 거칠기계수(JRC)를 검증하였다. 먼저 절리 시료의 JRC, 절리면압축강도(JCS)와 기본마찰각(ϕb)을 이용하여 Barton (1973)의 전단강도 기준식에서 절리의 전단강도를 추정하고, 직접전단시험에서 측정된 전단강도와 비교하였다. 직접전단시험에서 측정된 전단강도는 1번과 4번 표준 거칠기를 제외한 8개 시료에서 Barton의 기준식에서 추정된 전단강도보다 낮았고, JRC가 큰 시료에서 차이가 더욱 크게 나타났다. 직접전단시험 결과를 역해석하여 JRC, JCS 그리고 ϕb의 적절성을 검토하였고, JRC의 문제점으로 인하여 측정된 전단강도가 추정된 전단강도보다 낮은 것으로 판명되었다. 역해석으로 구한 표준 거칠기 단면의 JRC 값인 JRCm은 JRC보다 전반적으로 낮은 값을 보이지만 JRC와 상관성이 매우 높은 직선의 관계를 나타내었다. 위의 결과를 종합하여 표준 거칠기 단면의 정확한 JRCm을 제시하였고, JRCm과 JRC의 상관관계를 제시하였으며, Barton의 전단강도 기준식을 수정하여 제안하였다.

키워드
절리면
전단강도
절리 거칠기 계수
복제 절리시료
직접전단시험
역해석
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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 : 31
  • No :4
  • Pages :561-577
  • Received Date : 2021-11-05
  • Revised Date : 2021-11-26
  • Accepted Date : 2021-11-28
  • DOI :https://doi.org/10.9720/kseg.2021.4.561
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