The Journal of Engineering Geology (지질공학)

The Korean Society of Engineering Geology (대한지질공학회)
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A Case Study on the Reinforcement of Stabilizing Piles against Slope Failures in a Cut Slope

사면붕괴가 발생된 절개사면에서의 억지말뚝 보강 사례연구

  • Song Young-Suk (Geological & Environmental Hazards Division, Korea Inst. Geoscience and Mineral Res)
  • 송영석 (한국지질자원연구원 지질환경재해연구부)
  • Published : 2006.06.01
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Abstract

This paper presents a field study of the stability of slope collapsed during road construction and proposes a reasonable countermeasure if the current slope is unstable. As a result of slope investigation, it was found that the slope includes five tension cracks and the sliding surface is started from the tension crack and propagated the surface soil layer through weathered rock layer. The slope stability analyses are conducted in case of dry and rainfall seasons. The results indicate that the slope is unstable status. A reinforcement method of slope failure should be selected according to the scale of failure. That is, the scale of slope failure, which is classified small, middle and large size determines the reinforcement method of slope. Since the slope interested in this study is large size failure slope, the reinforcement method to control slope failure is selected stabilizing piles, and seed spray and drainage of surface waterare also selected to remain the factor of safety. The SLOPILE (Ver. 3.0) program is applied in order to do stability analysis of slope reinforced by piles. As the result of analysis, the slope reinforced by a row of piles shows the stable state. It is clearly confirmed that the stabilizing of piles can improve the stability of slope.

본 논문은 도로공사시 발생된 붕괴사면을 대상으로 사면안정성을 검토하고, 불안정할 경우 합리적인 사면보강공법을 제안한 현장사례 연구이다. 사면조사결과 대상사면은 5개의 대규모 인장균열을 포함하고 있으며, 사면활동은 인장균열에서 시작하여 표토층과 풍화암층사이까지 발생된 것으로 판단된다. 사면안정해석은 건기시와 우기시에 대하여 각각 수행되었으며, 대상사면은 현재 불안정한 것으로 예측되었다. 사면보강공법은 사면의 파괴규모에 따라 선정하는 것이 바람직하다. 즉, 파괴규모에 따라 소규모파괴, 중규모파괴, 그리고 대규모파괴로 나누고 각각의 파괴규모에 따라 사면보강공법을 결정할 수 있다. 대상사면의 경우 대규모파괴에 해당하므로 사면보강공법은 안전율증가공으로 억지말뚝공을 채택하고, 안전을 유지공으로 식생공(Seed Spray) 및 지표수배제공을 채택할 수 있다. 억지말뚝으로 보강된 사면의 안정해석을 위하여 SLOPILE(Ver 3.0)프로그램을 적용하였다. 사면안정 해석결과 1열의 억지말뚝을 시공할 경우 안정한 것으로 나타났으며, 해석결과로부터 억지말뚝의 사면안정효과를 확인할 수 있다.

Keywords

References

  1. 송영석, 2004, 활동억지시스템으로 보강된 사면의 설계법, 중앙대학교 대학원 박사학위논문
  2. 이부경, 2003, 지질방재공학, 도서출판 대윤, 228-332
  3. 홍원표, 송영석 2006, 활동억지시스템으로 보강된 사면의 안정해석 프로그램 개발, 지질공학, 16(1), pp.45- 58
  4. 홍원표, 송영석, 2002, 우리나라에서의 사면안정대책공법 적용사례 연구, 한국지반공학회 사면안정학술발표회 논문집, 초청강연, pp.1-28
  5. 홍원표, 송영석, 2004, 측방변형속 줄말뚝에 작용하는 토압의 산정법, 한국지반공학회논문집, 20(3), pp.13-22
  6. 홍원표, 한중근, 송영석, 신도순, 2003, 대절토사면에 보 강된 억지말뚝의 활동억지효과에 관한 연구, 한국지 반공학회 사면안정학술발표회 논문집, pp.65-81
  7. De Beer, E. and Wallays, M., 1970, Stabilization of slope in schist by means of board piles reinforced with steel beams, Proc. 2nd International Congress Rock Mechanics, Belgrade, 3, pp.361-369
  8. Ergun, M. U., 2000, Stabilization of landslides using piles, Proc. of 8th ISL, Cardiff, pp.513-518
  9. Hong, W.P. and Park, N.S., 2000, A design of slope stabilization using piles; A case study on the slopes of Hwangryung-mountain in Pusan, Korea, Proc. of 8th ISL, Cardiff, pp.725-730
  10. Hong, W.P. Song, Y.S. and Lee, J.H., 2004a, Behavior of stabilizing piles installed in cut slope during heavy rainfall, Proc. 9th Inter. Symposium on Landslides, Rio de Janeiro, Brazil, pp.655-661
  11. Hong, W.P. Han, J.G., Song, Y.S. and Lee, J.H., 2004b, Reinforcement effect of stabilizing piles in largescale cut slope, Proc. 9th Inter. Symposium on Landslides, Rio de Janeiro, Brazil, pp.1579-1583
  12. Ito, T., Matsui, T. and Hong, W. P., 1981, Design method for stabilizing piles against landslide-one row of piles, Soils and Foundations, 21(1), pp.21-37 https://doi.org/10.3208/sandf1972.21.21
  13. Ito, T., Matsui, T. and Hong, W. P., 1982, Extended design method for multi-row stabilizing piles against landslides, Soils and Foundations, 22(1), pp.1-13 https://doi.org/10.3208/sandf1972.22.1
  14. Japanese National Railways, 1974, Modern inspection and maintenance procedure for railway structures, Japan Railway Civil Engineering Association, pp.691-739 (in Japanese)
  15. Matsui, T., Hong, W. P. and Ito, T., 1982, Earth pressure on piles in a row due to lateral soil movements, Soils and Foundations, 22(2), pp.71-81 https://doi.org/10.3208/sandf1972.22.2_71
  16. Okada, K. and Sugiyama, T., 1994, A risk estimating method of railway embankment collapse due to heavy rainfall, Structural Safety, Elsevier, 14, pp.131- 150 https://doi.org/10.1016/0167-4730(94)90010-8
  17. Okada, K. Sugiyama, T., Muraishi, H. and Noguchi, T., 1992, Statistical estimating method of railway embankment damage due to rainfall, Proc. of JSCE, No. 448/III-19, pp.25-34
  18. Popescu, M. E., 1991, Landslide control by means of a row of piles, Slope Stability Engineering, London, pp.389-394
  19. Schuster, R. L., 1992, Keynote paper : Recent advances in slope stabilization, Proc. of 6th ISL, Christchurch, New Zealand, pp.1715-1745
  20. Sugiyama, T., Okada, K. Muraishi, H., Noguchi, T. and Samizo, M., 1995, Statistical rainfall risk estimating method on deep collapse of cut slope, Soils and Foundations, 15(4), pp.37-48
  21. Task Committee of Japanese Geotechnical Society, 1996, Manual for zonation on rain-induced slope failure (Preliminary draft), Japanese Geotechnical Society
  22. Viggiani, C., 1981, Ultimate lateral load on piles used to stabilize landslides, Proc. of 10th ICSMFE, Stockholm, 3, pp.555-560
  23. Winter, H., Schwarz, W. and Gudehus, G., 1983, Stabilization of clay slopes by piles, Proc. of 8th European Conf. on SMFE, Helsinki, pp.545-550
  24. 福本安正, 1976, 地スベリ防止グイの擧動について, 土質 工學會論文報告集, 16(2), pp.91-103
  25. 山田 邦光, 1982, 最新の斜面安定工法(設計.施工), 理工圖 書, 東京