Land and Housing Review (토지주택연구)

Land and Housing Research Institute (한국토지주택공사 토지주택연구원)
권호 표지
DOI QR코드

DOI QR Code

Comparison of Infiltration Rate of Slope in Model Test and Finite Element Analysis

모형시험과 유한요소해석에서 비탈면 강우의 침투량 비교

  • Received : 2018.06.08
  • Accepted : 2018.06.28
  • Published : 2018.07.30
Download PDF
⟨ Previous Next ⟩

Abstract

The causes of landslides are dependant on rainfall events and the soil characteristics of a slope. For the conventional slope stability, the slope stability analysis has been carried out assuming the saturated soil theory. But, in order to clearly explain a proper soil slope condition by rainfall, the research should be performed using the unsaturated soil mechanism suitable for a soil slope in the field. In the study, by using two major categories of soils in Korea, such as granite and gneiss weathered soils, landslide model test and finite element method have been compared with the difference of seepage and soil stability analysis. The hydraulic conductivity of gneiss weathered soil is slower than that of granite weathered soil, and the gneiss weathered soil contains much finer soils than the granite weathered soil. It was confirmed that the instability of the slope was progressing slowly due to the slow rate of volumetric water content of the surface layer.

Keywords

References

  1. 김재홍, 김유성 (2011), 부분포화토의 침투와 흙의 거동에 따른 유효응력 계수 분석, 한국지반공학회 논문집, 제27권, 12호, pp. 117-126.
  2. 한국지질자원연구원 (2016), 실시간 모니터링 기반의 산사태 신속탐지기술 개발, 미래창조과학부, p.217
  3. Fredlund, D. G. and Xing, A. (1994), "Equations for the soilwater characteristic curve", Canadian geotechnical Journal, Vol.31, No.3, pp.512-532.
  4. GeoStudio Ver 8.0 (2012), Seepage modelling with SEEP/W, Calgary, Canada.
  5. Kim, J. (2002), "Stability analysis on unsaturated weathered infinite slopes based on rainfall-induced wetting", Dept. of Civil Engineering, Master Thesis, Yonsei University.
  6. Kim, J., Jeong, S., Park, S., and Sharma, J. (2004), "Influence of rainfall-induced wetting on the stability of slopes in weathered soils" Engineering Geology pp. 251-262.
  7. Lu, N., Godt, J.W., and Wu, D.T. (2010), "A closed-form equation for effective stress in unsaturated soil," Water Resources Research, Vol. 46: W05515.
  8. Lu, N. and Likos, W. (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)
  9. Ministry of Land, Transportation and Maritime Affairs (2011), Construction of slope design criteria, guideline, pp.119-133. (in Korean)
  10. Ng, C.W.W. and Pang, Y.W. (2000), "Influence of stress state on soil-water characteristics and slope stability," Journal of Geotechnical and Geoenvironmental Engineering, Vol. 126, No. 2, pp. 157-166. https://doi.org/10.1061/(ASCE)1090-0241(2000)126:2(157)
  11. Nuth, M. and Laloui, L. (2007), "Effective stress concept in unsaturated soils: Clarification and validation of a unified framework," International Journal for Numerical and Analytical Methods in Geomechanics, Vol. 32, pp. 771-801.
  12. Petley, D. N. (2004), The evolution of slope failures: mechanisms of rupture propagation, Natural Hazards and Earth System Sciences, Vol. 4, 147-152. https://doi.org/10.5194/nhess-4-147-2004
  13. van Genuchten, M. (1980), "Closed-form equation for predicting the hydraulic conductivity of unsaturated soils," Soil Science Society of America Journal, Vol. 44, No. 5, pp. 35-53.