지질공학 (The Journal of Engineering Geology)

  • 제27권3호
  • /
  • Pages.267-274
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  • 2017
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  • 1226-5268(pISSN)
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  • 2287-7169(eISSN)
대한지질공학회 (The Korean Society of Engineering Geology)
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강우에 의한 암반사면 파괴 해석 사례 연구를 통한 해석방법 적용성 검토

Review of Applicability of Analysis Method based on Case Study on Rainfall-Induced Rock Slope Failure

  • Jung, Jahe (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Kim, Wooseok (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
  • 투고 : 2017.08.11
  • 심사 : 2017.09.13
  • 발행 : 2017.09.30
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초록

암반은 암석재료 자체의 역학적 성질과 암반내에 분포하는 불연속면의 기하학적 특징에 의해 그 역학적 특성이 좌우된다. 암반사면의 경우에는 불연속면에 의해 특히 파괴면의 위치와 파괴후의 거동 등이 달라진다. 본 논문에서는 불연속면의 규모에 따라 암반사면의 파괴형태가 달라지는 점을 고려하여, 원호파괴와 평면파괴 안정해석을 위한 2개의 3D 해석방법을 개발하고 실제 사면에 적용하여 그 적용성을 검토하였다. 결과, 원호파괴의 경우, 자연건조상태에서는 안정하지만 강우에 의해 표층 함수비가 증가하면 불안정해지는 해석 결과를 얻었다. 평면파괴의 경우도 강우에 의해 불연속면 자체의 마찰각이 감소하는 영향에 의해 건조상태보다 불안정해지는 결과가 나타났다. 이상의 해석 결과로부터 실제 사면에서의 현상을 잘 반영하는 것으로 보아, 개발된 해석방법이 사면안정성 검토 또는 유지관리의 목적으로 적용가능하다고 판단된다.

Behavior of rock mass depend on the mechanical properties of intact rock and geometrical property of discontinuity distributed in rock mass. In case of rock slope, particularly, location of slope failure surface and behavior after failure are changed due to discontinuities. In this study, two 3D slope stability analysis methods were developed for two different failure types which are circular failure and planar failure, considering that failure type of rock slope is dependent on scale of discontinuity which was then applied to real rock slope to review the applicability. In case of circular failure, stable condition was maintained in natural dry condition, which however became unstable when the moisture content of the surface was increased by rainfall. In case of planar failure, rock slope become more unstable comparing to dry condition which is attributable to decrease in friction angle of discontinuity surface due to rainfall. Viewing analysis result above, analysis method proved to have well incorporated the phenomenon occurred on real slope from the analysis result, demonstrating its applicability to reviewing the slope stability as well as to maintaining the slope.

키워드

참고문헌

  1. Bishop, A.W., 1955, The use of the slip circle in stability analysis of slopes, Geotechnique, 5(1), pp. 7-17. https://doi.org/10.1680/geot.1955.5.1.7
  2. Janbu, N., 1954, Application of composite slip surfaces for stability analysis, In Proceedings European Conference on Stability of Earth Slopes, Stockholm, Sweden, 3, pp. 43-49.
  3. Hovland, H.J, 1977, Three-dimensional slope stability analysis method, J. Geotech. Eng. Div., ASCE, 103. GT9, pp. 971-986.
  4. Ugai, K. and Hosobori K., 1988, Extension of simplified Bishop method, simplied Janbu method and spencers method to three dimensions, JSCE, 394. III-9, pp. 21-26 (in Japanese).
  5. Yamagami T. and Ugai, K., 2001, A survey of stability and deformation analysis of slopes: LEM and FEM, Journal of the Japan Landslide Society, 38(3), pp. 169-179 (in Japanese).
  6. Kyoya, T., 2005, Development of a system of three-dimensional slope stability analysis utilizing digital data of geography, In Proceedings of the third International Workshop on Geoengineering, Hanoi, Vietnam.
  7. Jung, J., 2012, Study on stability analysis evaluation system of discontinuous rock mass slope, Ph.D. Thesis, Tohoku University (in Japanese).
  8. Jung. J., 2004, Prediction mapping for landslide occurrence using GIS and result comparison in Yongin-Ansung area, M.S. Thesis, Kyungpook University (in Korean).
  9. Moriwaki H. and Sasaki Y., 2007, Relative risk evaluation of old landslides with slope stability anlaysis, Landslides-Journal of the Japan landslide Society, 44(1), pp. 25-32 (in Japanese). https://doi.org/10.3313/jls.44.25
  10. Patton F.D., 1966, Multiple modes of shear failure in rock, In Proceedings of First International Congress on Rock Mechanics, Lisbon, Portugal, 1, pp. 509-513.
  11. Goodman R.E., 1989, Introduction to Rock Mechanics-2nd ed., John Wiley & Sons, pp. 141-173.