직접전단시험에서 절리면의 2차 거칠기가 거칠기 정량화 파라미터에 미치는 영향
Influence of Joint Secondary Roughness on Roughness Parameter in Direct Shear Test
2
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
절리면의 전단강도를 결정하는 중요한 인자로 알려진 암반 절리면의 거칠기는 여러 가지 방법에 의해연구되어 왔다. 하지만, 거칠기를 구성하는 요소인 1차 거칠기와 2차 거칠기를 분리하여 거칠기를 평가하려는시도는 매우 제한적으로 수행되고 있다. 본 연구에서는 인장절리 시험편을 이용하여 직접전단시험을 통해 2차거칠기 요소를 파괴하고 이를 거칠기 파라미터를 이용하여 정량화 하였다. 거칠기 파라미터는 수직응력과 측정간격이 증가할수록 감소하였으나, 1.5 MPa 이상의 수직응력에서는 일정한 경향을 나타내지 않았다. 또한 전단반대방향의 거칠기 면적 감소율은 거칠기 파라미터가 증가할수록 감소하였다.
Abstract
Rock joint surface roughness, which is known to be one of the most important factors for defining shearstrength of rock mass, has been researched in various methods. However, approaches to separate a roughness intotwo groups (primary and secondary) for evaluating the roughness have been rarely performed. In this study, elementsof secondary roughness were eliminated through direct shear testing with tensile joint specimen and they werequantified with joint parameters. It is revealed that roughness parameters decrease with increasing the normal stressand sampling intervals, except for the case in which the normal stress is larger than 1.5 MPa. Also it is analyzedthat ratio of area reduction in the opposite direction of shearing decreases with increasing the roughness parameter.
참고문헌 (15)
- Barton, N.R., "The shear strength of rock and rock joints", Int. J. Rock Mech. Min. Sci. & Geomech. Abstr, 13, pp.255~279 (1976)
- Barton, N.R., "Shear strength of rock joints in theory and practice", Rock Mech. and Rock Engng, 10, pp.1~54 (1977)
- Barton, N., "Strength deformation and conductivity coupling of rock joints", Int. J. of Rock Mech. and Rock Min. Sci. & Geomech. Abst, 9, pp.579~602 (1985)
- Belem, T., "Quantitative parameters for rock joint surface roughness", Rock Mech. and Rock Engng, 33, pp.217~242 (2000)
- Chun, B.S., "A numerical study on the quantification of rock joint roughness", Korean Geotechnical Society, 17, pp.85~97 (2001)
- Hsiung, S.M., "Assessment of conventional methodologies for joint roughness coefficient determination", Int. J. Rock Mech. Min. Sci. Geomech. Abstr, 30, pp.825~829 (1993)
- ISRM, "Rock characterization, testing and monitoring:ISRM suggested Methods", pp.131~140 (1981), Pergamon
- 이덕환, "표면평균기울기를 이용한 암석절리면의 3차원 거칠기 분석에 관한 연구", 터널과 지하공간, 21(6), pp.494~507 (2011), 한국암반공학회
- Park, B.Y., "Current status of the characterization of the rock joint surface", Tunnel &Underground, 10, pp.566~579 (2000)
- Scholz, C.H., "The role of asperity indentation and ploughing in rock friction-I:asperity creep and stick-slip", Int. J. Rock Mech. and Rock Mech. Min. Sci. Geomech. Abstr, 13, pp.149~154 (1976)
- Seidel, J.P., "A theoretical model for rock joints subjected to constant normal stiffness direct shear", Int. J. Rock Mech. and Rock Mech. Min. Sci, 39, pp.539~553 (2002)
- Tse, R., "Estimating joint roughness coefficients", Int. J. Rock Mech. Min. Sci. Geomech. Abstr, 16, pp.303~307 (1979)
- Walraven, J.C., "Fundamental analysis of aggregate interlock", J. of the Structural Eng. Division, 107, pp.2245~2270 (1981), ASCE
- Zhang, P., "Surface roughness analysis of rock joints based on a 3D surface model", Int. Young Scholars' Symposium on Rock Mech, pp.243~247 (2008)
- Zhao, J., "Influence of joint matching characteristics in rock slope stability", Proceedings of ISRM Regional Symposium on Rock Slopes, pp.139~146 (1992)