Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
권호 표지

An Analysis of Cut-slope Based on the Prediction of Joint Distribution inside the Cut-face

개착면 내부에서의 절리분포 예측을 통한 사면 해석

  • Published : 2004.12.01
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Abstract

An algebraic algorithm for predicting the joint trace distribution on the cut-face of rock slope based on the orientations and the locations of joints investigated in the borehole has been developed. Joint trace prediction is manipulated by utilizing the three dimensional plane equations of both joint planes and projection face, and the extent of trace within the projection area is calculated by considering the persistence of each joint plane. Joint trace prediction method is efficiently applied for analyzing the stability and the adequacy of support design of Gimhae Naesam cut-slope, which is structurally unstable due to slumping. Structural characteristics of rock mass is investigated by performing DOM drilling and the potential rock mass sliding inside slope face is analyzed by examining the orientations of joint planes which can induce the slope failure. Also, the efficiency of anchor support design is evaluated by considering the joint trace distribution on the anchor installation area and its sliding potential.

시추공에서 관찰된 절리면의 방향성과 위치자료를 이용하여 개착면에서의 trace 분포를 예측하는 대수학적 기법을 개발하였다. 절리 trace 예측은 절리면과 투영면의 3차원 평면식을 활용하여 대수학적으로 수행되며, 개별 불연속면의 영속성을 고려하여 투영 영역 내에서 trace가 표출되는 범위가 산정된다. 절리 예측기법을 활용하여 슬럼핑 현상에 의해 구조적으로 불안정한 김해 내삼사면의 안정성 및 보강 계획의 적정성을 분석하였다. DOM 시추작업을 수행하여 암반구조 특성을 조사하였으며, 사면 파괴를 유발시킬 수 있는 절리들을 추출하여 심도별 지반거동 특성을 분석하였다. 또한, 사면보강을 위하여 계획된 앵커 정착부에서의 절리분포 및 거동양상을 분석하고 앵커 보강의 효율성을 고찰하였다.

Keywords

References

  1. 부경대학교 산업과학기술연구소, 2004, 내삼농공단지 산사태지역 사면의 안정 검토 및 시공에 관한 연구
  2. Barton, N., Bandis, S. C., and Bakhtar, K. 1985, Strength, deformation and conductivity of rock joints. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts, 22(3), 121-140 https://doi.org/10.1016/0148-9062(85)93227-9
  3. Fisher, R. 1953, Dispersion on a sphere. Proceedings of the Royal Society of London, A217, 295-305
  4. Ladanyi, B. and Archambault, G. 1970, Simulation of shear behavior of a jointed rock mass. Proc. 11th Symp. Rock Mech., AIME, New York, 105-125
  5. Mahtab, M. A. & Yegulalp, T. M. 1982, A rejection criterion for definition of clusters in orientation data. In R. E. Goodman and F. E. Heuze (eds),. In Issues in Rock Mechanics Proceedings of the 22nd Symposium on Rock Mechanics, Berkeley. American Institute of Mining Metallurgy and Petroleum. Engineers, New York: 116-23
  6. Priest, S. D. 1985, Hemispherical Projection Methods in Rock Mechanics, George Allen and Unwin, London
  7. Read, S., Richards, L. and Cook, G., 2003, Rock mass defect patterns and the Hoek-Brown failure criterion, Proc. 10th Cong. ISRM, South Africa
  8. Woodcock, N. H., 1977, Specification of fabric shapes using an eigenvalue method, Bulletin of the Geological Society of America, 88, 1231-1236 https://doi.org/10.1130/0016-7606(1977)88<1231:SOFSUA>2.0.CO;2
  9. Yoon, K.S., Cho, T.F., You, B.O. & Won, K.S. 2003, A new approach for borehole joint investigation Development of Discontinuity Orientation Measurement drilling system. Proc. 10th Congress of the ISRM: 1355-1358