Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Recommendation of I-D Criterion for Steep-Slope Failure Estimation Considering Rainfall Infiltration Mechanism

강우침투 메커니즘을 이용한 급경사지 붕괴예측 I-D 기준식 제안

  • Received : 2013.04.02
  • Accepted : 2013.05.21
  • Published : 2013.05.31
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Abstract

The natural disaster occurrences and the loss of lives caused by the steep-slope failures in Korea were investigated in this study. The investigation includes the frequency rate of the steep-slope failures with respect to the characteristics of precipitation, underlying bedrock, and weathered soils. Analysis on the problems in the existing estimation methods of steep-slope failure was also undertaken, and a new model using unsaturated infinite slope stability was developed for the better slope failure estimation. The slope analyses by the newly developed model were performed considering unsaturated infinite slope, the gradient of slope, and hydro/mechanical properties of soils. Steep-slope failure estimation criterion is proposed based on the analysis results. In addition, the precipitation amount corresponding to warning stages against steep-slope failure is provided as an equation of Intensity-Duration criterion.

본 연구에서는 우리나라에서 발생된 자연재해 및 급경사지 재해 사망자 현황을 분석하고, 급경사지 붕괴사례를 대상으로 강우특성과 기반암 풍화토에 따른 재해 발생빈도를 분석하였다. 또한, 선행연구에서 제시한 급경사지 붕괴 예측 기준을 고찰하여 한계점을 도출하고, 불포화 무한사면 안정이론을 도입하여 급경사지 붕괴예측 기준으로 활용하고자 하였다. 지반의 경사, 수리적-역학적 특성을 고려할 수 있는 불포화 무한사면의 안정이론을 이용하여 안정해석을 수행하였으며, 산정된 안전율에 안전수준을 나타낼 수 있는 경계기준을 제시하여 급경사지 붕괴예측 기준을 제안하였다. 또한 급경사지 붕괴 위험단계에 해당하는 강우량을 Intensity-Duration 기준 수식으로 제시하였다.

Keywords

References

  1. ASCE (1996), Hydrology handbook, Second Edition, ASCE Manual and Reports on Engineering Practice No.28, pp.75-90.
  2. Caine, N. (1980), "The Rainfall Intensity-Duration Control of Shallow Landslides and Debris Flows", Physical Geography, Vol.62, No.1/2, pp.23-27.
  3. Cannon, S., Gartner, J., Wilson, R., Bowers, J., and Laber, J. (2008), "Storm Rainfall Conditions for Floods and Debris Flows from Recently Burned Areas in Southwestern Colorado and Southern California", Geomorphology, Vol.96, pp.250-269. https://doi.org/10.1016/j.geomorph.2007.03.019
  4. Chien-Yuan, C., Tien-Chien, C., Fan-Chieh, Y., Wen-Hui, Y., and Chun-Chieh, T. (2005), "Rainfall Duration and Debris-Flow Initiated Studies for Real-Time Monitoring", Environmental Geology, Vol.47, pp.715-724. https://doi.org/10.1007/s00254-004-1203-0
  5. Cho, S. E. and Lee, S. R. (2000), "Slope Stability Analysis of Unsaturated Soil Slopes Due to Rainfall Infiltration", Journal of the Korean geotechnical society, Vol.16, No.1, pp.51-64.
  6. Dahal, R. K. and Hasegawa, S. (2008), "Representative Rainfall Thresholds for Landslide in the Nepal Himalaya", Geomorphology, No.100, pp.429-443.
  7. Fredlund, D.G., Morgenstern, N.R., and Widger, R.A. (1978), "The Shear Strength of Unsaturated Soils", Canadian Geotechnical Journal, Vol.15, pp.313-321. https://doi.org/10.1139/t78-029
  8. Guzzetti, F., Peruccacci, S., Rossi, M., and Stark, C. (2007), "Rainfall Thresholds for the Initiation of Landslides in Central and Southern Europe", Meteorology and Atmospheric Physics, Vol.98, pp.239-267. https://doi.org/10.1007/s00703-007-0262-7
  9. Guzzetti, F., Peruccacci, S., Rossi, M., and Stark, C. (2008), "The Rainfall Intensity-Duration Control of Shallow Landslides and Debris Flows: An Update", Landslides, Vol.5, pp.3-17. https://doi.org/10.1007/s10346-007-0112-1
  10. Hong, Y., Hiura, H., Shino, K., Sassa, K., Suemine, A., Fukuoka, H., and Wang, G. (2005), "The Influence of Intense Rainfall on the Activity of Large-Scale Crystalline Schist Landslides in Shikoku Island, Japan", Landslides, Vol.2, pp.97-105. https://doi.org/10.1007/s10346-004-0043-z
  11. Ikeya, H. (1989), "Debris Flow and Its Countermeasures in Japan", Bulletin of the IAEG, Vol.40, pp.15-30.
  12. IPCC (2007), Climate change, 2007: The Physical Science Basis. Contributions of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Intergovernmental Panel on Climate Change, Cambridge University Press, pp.996.
  13. Jeong, S. S., Choi, J. Y., and Lee, J. H. (2009), "Stability Analysis of Unsaturated Weathered Soil Slopes Considering Rainfall Duration", KSCE Journal of Civil Engineering, Vol.29, No.1, pp.1-9.
  14. Jibson, R. (1989), "Debris Flow in Southern Puerto Rico", Special Paper of Geological Society of America, Vol.236, pp.29-55. https://doi.org/10.1130/SPE236-p29
  15. Gavin, K. and Xue, J. (2008), "A Simple Method to Analyze Infiltration into Unsaturated Soil Slopes", Computers and Geotechnics, Vol.35, pp.223-230. https://doi.org/10.1016/j.compgeo.2007.04.002
  16. Kim, Y. M. and Jung, S. W. (2000), "A Study on the Rainfall- Triggered Landslides in Taijon-Chungnam Area", Journal of Civil Engineering, Vol.20, No.4-C, pp.341-355.
  17. KFS (1993), Manual of Investigation and Evaluation of Potential Landslide Areas, Korea Forest Service.
  18. Larsen, M. and Simon, A. (1993), "A Rainfall Intensity-Duration Threshold for Landslides in a Humid-Tropical Environment, Puerto Rico", Physical Geography, Vol.75, pp.13-23.
  19. Lu, N. and Likos, W. J. (2006), "Suction Stress Characteristic Curve for Unsaturated Soil", Journal of Geotechnical and Geoenvironmental Engineering, Vol.132, No.2, pp.131-142. https://doi.org/10.1061/(ASCE)1090-0241(2006)132:2(131)
  20. Mein, R. G. and Larson, C. L. (1973), "Modeling Infiltration During a Steady Rain", Water Resources Research, Vol.9, No.2, pp.384-394. https://doi.org/10.1029/WR009i002p00384
  21. NIDP (2010), Improvement of Disaster Warning System for Steep Slope, NIDP Research Report, NIDP-PR-2010-01-02, National Institute of Disaster Prevention, pp.116-121.
  22. NIMR (2009), Understanding of Climate Change II, KMA Research Report, 11-1360395-000160-01, National Institute of Meteorological Research, pp.3-26.
  23. Park, D. K., Oh, J. R., Son, Y. J., and Lee, M. S. (2009), "Analysis of the Steep Slope Disasters in 2009", Proc. of the 35th KSCE Conference, Hoengseong, pp.88-91.
  24. Park, S. W. and Shin, G. H. (2009), "Stability Analysis on Unsaturated Gneiss Weathered Soil Slopes Considering Wetting Path Soil-Water Characteristic Curve", KSCE Journal of Civil Engineering, Vol.29, No.5C, pp.191-198.
  25. Park, Y. W., Kim, K. L., and Y, W. K. (1993), "A Study on Yongin-Ansung Landslides in 1991", Journal of the Korean geotechnical society, Vol.9, No.4, pp.103-116.
  26. Rahardjo, H., Lim, T. T., Chang, M. F., and Fredlund, D. G. (1995), "Shear-Strength Characteristics of a Residual Soil", Canadian Geotechnical Journal, Vol.32, No.1, pp.160-77.
  27. Rahardjo, H., Ong, T.H., Rezaur, R.B., and Leong, E.C. (2007), "Factors Controlling Instability of Homogeneous Soil Slopes Under Rainfall", Journal of Geotechnical and Geoenvironmental Engineering, Vol.133, No.12, pp.1532-1543. https://doi.org/10.1061/(ASCE)1090-0241(2007)133:12(1532)
  28. Saito, H., Nakayama, D., and Matsuyama, H. (2010), "Relationship Between the Initiation of a Shallow Landslide and Rainfall Intensity- Duration Thresholds in Japan", Geomorphology, Vol.118, pp.167-175. https://doi.org/10.1016/j.geomorph.2009.12.016
  29. Shin, H., Kim, Y. T., and Park, D. K. (2013), "Development of Rainfall Hazard Envelope for Unsaturated Infinite Slope", KSCE Journal of Civil Engineering, Vol.17, No.2, pp.351-356. https://doi.org/10.1007/s12205-013-1626-9
  30. Van Genuchten, M. T. (1980), "A closed form equation predicting the hydraulic conductivity of unsaturated soils", Soil Science Society of America Journal, Vol.44, No.5, pp.892-898. https://doi.org/10.2136/sssaj1980.03615995004400050002x

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