Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Change of Slope Stability due to Slope Inclination and Surface Conditions

사면경사와 표면 조건에 따른 사면안정성 해석

  • 황영철 (상지대학교 건설시스템공학과)
  • Received : 2014.02.28
  • Accepted : 2015.02.12
  • Published : 2015.02.28
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Abstract

Slope stability is affected by duration of precipitation, probable rainfall intensity, unsaturated soil property, and soil strength. The recent analyses of slope stability tend to include unsaturated analysis based on infiltration properties of soil, while researches of unsaturated soil slope tend to include the analysis of deformation and stress distribution of soil over time. However, infiltration property of unsaturated soil slope depends not only on intensity or duration of precipitation, but also on relief and surface condition, which is not considered in status quo. This research uses hydrologic model parameters of soil in order to consider effects of inclination on filtration, and carries out analysis of unsaturated soil slope to confirm the effects according to slope inclination and surface condition. In conclusion, using slope stability analysis, the need to consider infiltration rate according to inclination and surface condition was confirmed even under the same precipitation conditions.

비탈면의 안정성은 강우지속시간, 확률강우강도, 지반의 불포화특성, 지반강도 등에 의해 영향을 받는다. 최근 비탈면안정성 해석은 지반의 침투특성을 고려한 불포화해석을 수행하고 있으며, 불포화 토사비탈면에 대한 연구는 시간변화에 따라 지반의 변형과 응력분포해석을 고려할 수 있도록 하는 방향으로 진행되고 있다. 그러나 이와는 별개로 불포화사면의 침투특성은 강우강도나 지속시간 뿐만 아니라 비탈면의 지형여건과 녹화상태에 따라서도 침투정도가 다르지만, 이에 대한 영향은 고려하지 않고 있다. 본 연구에서는 비탈면경사 및 표면상태에 따른 침투를 고려하기 위하여 토양의 수리특성을 고려한 모형을 사용하고, 토사비탈면에 대한 불포화해석을 수행하여 비탈면 경사에 따른 영향을 파악하였다. 연구결과 비탈면 안정해석시 동일한 강우조건 하에서도 비탈면경사에 따른 침투율이 고려되어야 할 필요성을 제시하였다.

Keywords

References

  1. Chun, K.W., Kwon, S.M., Seo, J.I., Cho, H.H., Kim, S.W., and Lee, D.K. (2013), "Rainfall Intensity Regulating Surface Erosion and Its Contribution to Sediment Yield on the Hillslope Devastated by a Shallow Landslide", Journal of Forest Science, Vol.29, No.4, pp.314-323. (in Korea) https://doi.org/10.7747/JFS.2013.29.4.314
  2. Fredlund, D.G. and Rahardjo, H. (1993), "Soil Mechanics for Unsaturated Soils", John Wiley & Sons, New York, pp.560.
  3. Fredlund, D.G. Xing, A., and Huang, S. (1994), "Predicting the Permeability Function for Unsaturated Soils Using the Soil-water Characteristic Curve", Canadian Geotechnical Journal, 31, pp.533-546 https://doi.org/10.1139/t94-062
  4. Green, W.H. and Ampt, G.A. (1911), "Studies of Soil Physics I. The Flow of Air and Water through Soils", J. Agr. Sci., 4, pp.1-24. https://doi.org/10.1017/S0021859600001441
  5. Hawkins, R.H., Jiang, R., Woodward, D.E., Hjelmfelt, A.T., and Van Mullem, J.A. (2002), "Runoff Curve Number Method: Examination of the Initial Abstraction Ratio", Proceedings of the Second Federal Interagency Hydrologic Modeling Conference, Las Vegas, Nevada (U.S. Geological Survey).
  6. Horton, R.E. (1939), "Analysis of Runoff-plat Experiment with Varying Infiltration Capacity", Transactions of the American Geophysical Union 20, pp.693-711. https://doi.org/10.1029/TR020i004p00693
  7. Horton, R.E. (1940), "An Approach Toward a Physical Interpretation of Infiltration Capacity", Soil Science Society of America Proceedings, Vol.5, pp.399-417.
  8. Leong, E. and Rahardjo, H. (1997), "Permeability Functions for Unsaturated Soils", J. Geotech. Geoenviron. Eng., Vol.123, No.12, pp.1118-1126. https://doi.org/10.1061/(ASCE)1090-0241(1997)123:12(1118)
  9. Lee, G.J., Lee, J.T., Ryu, J.S., Kim, J.S., Lee, Y.G., Kim, J.I., and Ji, S.N. (2011), "Effect of Cover Crop Cultivation to Improve Soil Physical Property in Highland", Highland Agriculture Research Center, National Institute of Crop Science. (in Korea)
  10. Moon, Y.I., Lee, I.J., and Oh, T.S. (2008), "Estimation of Infiltration and Simulation of Seepage Behavior in Slope using the Rainfall Data in Seoul", The Korean Society of Societal Security, Vol.8, No.5, pp.103-109. (in Korea)
  11. Ng, C.W.W. and Shi, Q. (1998), "A Numerical Investigation of the Stability of Unsaturated Soil Slopes Subjected to Transient Seepage", Comput. Geotech., Vol.22, No.1, pp.1-28. https://doi.org/10.1016/S0266-352X(97)00036-0
  12. Park, J.J., Kim, K.W., and Kim, B.J. (2008), "A Study of Stability Analysis on Unsaturated Soil Slopes Considering Rainfall", Korean Geosynthetice Society, Vol.7, No.4, pp.9-18. (in Korea)
  13. Pradel, D. and Raad, G. (1993), "Effect of Permeability on Surficial Stability of Homogeneous Slopes", J. Geotech. Engrg. ASCE, Vol.119, No.2, pp.315-332.
  14. Rawls, W.J., Brakensiek, D.L., and Saxton, K.E. (1982), "Estimation of Soil Water Properties", TRANSACTIONS of the ASAE, Vol.25, No.5, pp.1316-1320. https://doi.org/10.13031/2013.33720
  15. Sin, D.J. (2008), "A Study on the Analysis of the Groundwater Level Considering the Slope Angle and Calculation of Infiltration According to the Rainfall Intensity", University of Seoul, Master's thesis, pp.1-80.
  16. United States Department of Agriculture (1986), Urban hydrology for small watersheds. Technical Release 55 (TR-55) (Second Edition ed.). Natural Resources Conservation Service, Conservation Engineering Division.
  17. Vanapalli, S.K., Fredlund, D.G., Pufahl, D.E., and Clifton, A.W. (1996), "Model for the prediction of shear strength with respect to soil suction", Canadian Geotechnical Journal, Vol.33 pp.379-392. https://doi.org/10.1139/t96-060

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